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2 | -=< The IBM Microchannel SCSI-Subsystem >=- | |
3 | ||
4 | for the IBM PS/2 series | |
5 | ||
6 | Low Level Software-Driver for Linux | |
7 | ||
8 | Copyright (c) 1995 Strom Systems, Inc. under the terms of the GNU | |
9 | General Public License. Originally written by Martin Kolinek, December 1995. | |
10 | Officially modified and maintained by Michael Lang since January 1999. | |
11 | ||
12 | Version 4.0a | |
13 | ||
14 | Last update: January 3, 2001 | |
15 | ||
16 | Before you Start | |
17 | ---------------- | |
18 | This is the common README.ibmmca file for all driver releases of the | |
19 | IBM MCA SCSI driver for Linux. Please note, that driver releases 4.0 | |
20 | or newer do not work with kernel versions older than 2.4.0, while driver | |
21 | versions older than 4.0 do not work with kernels 2.4.0 or later! If you | |
22 | try to compile your kernel with the wrong driver source, the | |
23 | compilation is aborted and you get a corresponding error message. This is | |
01dd2fbf | 24 | no bug in the driver; it prevents you from using the wrong source code |
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25 | with the wrong kernel version. |
26 | ||
27 | Authors of this Driver | |
28 | ---------------------- | |
29 | - Chris Beauregard (improvement of the SCSI-device mapping by the driver) | |
30 | - Martin Kolinek (origin, first release of this driver) | |
31 | - Klaus Kudielka (multiple SCSI-host management/detection, adaption to | |
32 | Linux Kernel 2.1.x, module support) | |
33 | - Michael Lang (assigning original pun/lun mapping, dynamical ldn | |
34 | assignment, rewritten adapter detection, this file, | |
35 | patches, official driver maintenance and subsequent | |
36 | debugging, related with the driver) | |
37 | ||
38 | Table of Contents | |
39 | ----------------- | |
40 | 1 Abstract | |
41 | 2 Driver Description | |
42 | 2.1 IBM SCSI-Subsystem Detection | |
43 | 2.2 Physical Units, Logical Units, and Logical Devices | |
44 | 2.3 SCSI-Device Recognition and dynamical ldn Assignment | |
45 | 2.4 SCSI-Device Order | |
46 | 2.5 Regular SCSI-Command-Processing | |
47 | 2.6 Abort & Reset Commands | |
48 | 2.7 Disk Geometry | |
49 | 2.8 Kernel Boot Option | |
50 | 2.9 Driver Module Support | |
51 | 2.10 Multiple Hostadapter Support | |
52 | 2.11 /proc/scsi-Filesystem Information | |
53 | 2.12 /proc/mca-Filesystem Information | |
54 | 2.13 Supported IBM SCSI-Subsystems | |
55 | 2.14 Linux Kernel Versions | |
56 | 3 Code History | |
57 | 4 To do | |
58 | 5 Users' Manual | |
59 | 5.1 Commandline Parameters | |
60 | 5.2 Troubleshooting | |
01dd2fbf | 61 | 5.3 Bug reports |
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62 | 5.4 Support WWW-page |
63 | 6 References | |
64 | 7 Credits to | |
65 | 7.1 People | |
66 | 7.2 Sponsors & Supporters | |
67 | 8 Trademarks | |
68 | 9 Disclaimer | |
69 | ||
70 | * * * | |
71 | ||
72 | 1 Abstract | |
73 | ---------- | |
01dd2fbf ML |
74 | This README-file describes the IBM SCSI-subsystem low level driver for |
75 | Linux. The descriptions which were formerly kept in the source code have | |
76 | been taken out of this file to simplify the codes readability. The driver | |
1da177e4 | 77 | description has been updated, as most of the former description was already |
01dd2fbf ML |
78 | quite outdated. The history of the driver development is also kept inside |
79 | here. Multiple historical developments have been summarized to shorten the | |
80 | text size a bit. At the end of this file you can find a small manual for | |
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81 | this driver and hints to get it running on your machine. |
82 | ||
83 | 2 Driver Description | |
84 | -------------------- | |
85 | 2.1 IBM SCSI-Subsystem Detection | |
86 | -------------------------------- | |
87 | This is done in the ibmmca_detect() function. It first checks, if the | |
88 | Microchannel-bus support is enabled, as the IBM SCSI-subsystem needs the | |
89 | Microchannel. In a next step, a free interrupt is chosen and the main | |
90 | interrupt handler is connected to it to handle answers of the SCSI- | |
91 | subsystem(s). If the F/W SCSI-adapter is forced by the BIOS to use IRQ11 | |
92 | instead of IRQ14, IRQ11 is used for the IBM SCSI-2 F/W adapter. In a | |
93 | further step it is checked, if the adapter gets detected by force from | |
94 | the kernel commandline, where the I/O port and the SCSI-subsystem id can | |
95 | be specified. The next step checks if there is an integrated SCSI-subsystem | |
96 | installed. This register area is fixed through all IBM PS/2 MCA-machines | |
97 | and appears as something like a virtual slot 10 of the MCA-bus. On most | |
98 | PS/2 machines, the POS registers of slot 10 are set to 0xff or 0x00 if not | |
99 | integrated SCSI-controller is available. But on certain PS/2s, like model | |
100 | 9595, this slot 10 is used to store other information which at earlier | |
101 | stage confused the driver and resulted in the detection of some ghost-SCSI. | |
102 | If POS-register 2 and 3 are not 0x00 and not 0xff, but all other POS | |
103 | registers are either 0xff or 0x00, there must be an integrated SCSI- | |
104 | subsystem present and it will be registered as IBM Integrated SCSI- | |
105 | Subsystem. The next step checks, if there is a slot-adapter installed on | |
106 | the MCA-bus. To get this, the first two POS-registers, that represent the | |
107 | adapter ID are checked. If they fit to one of the ids, stored in the | |
108 | adapter list, a SCSI-subsystem is assumed to be found in a slot and will be | |
109 | registered. This check is done through all possible MCA-bus slots to allow | |
110 | more than one SCSI-adapter to be present in the PS/2-system and this is | |
111 | already the first point of problems. Looking into the technical reference | |
112 | manual for the IBM PS/2 common interfaces, the POS2 register must have | |
113 | different interpretation of its single bits to avoid overlapping I/O | |
114 | regions. While one can assume, that the integrated subsystem has a fix | |
115 | I/O-address at 0x3540 - 0x3547, further installed IBM SCSI-adapters must | |
116 | use a different I/O-address. This is expressed by bit 1 to 3 of POS2 | |
117 | (multiplied by 8 + 0x3540). Bits 2 and 3 are reserved for the integrated | |
118 | subsystem, but not for the adapters! The following list shows, how the | |
119 | bits of POS2 and POS3 should be interpreted. | |
120 | ||
121 | The POS2-register of all PS/2 models' integrated SCSI-subsystems has the | |
122 | following interpretation of bits: | |
123 | Bit 7 - 4 : Chip Revision ID (Release) | |
124 | Bit 3 - 2 : Reserved | |
125 | Bit 1 : 8k NVRAM Disabled | |
126 | Bit 0 : Chip Enable (EN-Signal) | |
127 | The POS3-register is interpreted as follows (for most IBM SCSI-subsys.): | |
128 | Bit 7 - 5 : SCSI ID | |
129 | Bit 4 - 0 : Reserved = 0 | |
130 | The slot-adapters have different interpretation of these bits. The IBM SCSI | |
131 | adapter (w/Cache) and the IBM SCSI-2 F/W adapter use the following | |
132 | interpretation of the POS2 register: | |
133 | Bit 7 - 4 : ROM Segment Address Select | |
134 | Bit 3 - 1 : Adapter I/O Address Select (*8+0x3540) | |
135 | Bit 0 : Adapter Enable (EN-Signal) | |
136 | and for the POS3 register: | |
137 | Bit 7 - 5 : SCSI ID | |
138 | Bit 4 : Fairness Enable (SCSI ID3 f. F/W) | |
139 | Bit 3 - 0 : Arbitration Level | |
140 | The most modern product of the series is the IBM SCSI-2 F/W adapter, it | |
141 | allows dual-bus SCSI and SCSI-wide addressing, which means, PUNs may be | |
142 | between 0 and 15. Here, Bit 4 is the high-order bit of the 4-bit wide | |
143 | adapter PUN expression. In short words, this means, that IBM PS/2 machines | |
144 | can only support 1 single integrated subsystem by default. Additional | |
145 | slot-adapters get ports assigned by the automatic configuration tool. | |
146 | ||
147 | One day I found a patch in ibmmca_detect(), forcing the I/O-address to be | |
148 | 0x3540 for integrated SCSI-subsystems, there was a remark placed, that on | |
149 | integrated IBM SCSI-subsystems of model 56, the POS2 register was showing 5. | |
150 | This means, that really for these models, POS2 has to be interpreted | |
151 | sticking to the technical reference guide. In this case, the bit 2 (4) is | |
152 | a reserved bit and may not be interpreted. These differences between the | |
153 | adapters and the integrated controllers are taken into account by the | |
154 | detection routine of the driver on from version >3.0g. | |
155 | ||
156 | Every time, a SCSI-subsystem is discovered, the ibmmca_register() function | |
157 | is called. This function checks first, if the requested area for the I/O- | |
158 | address of this SCSI-subsystem is still available and assigns this I/O- | |
159 | area to the SCSI-subsystem. There are always 8 sequential I/O-addresses | |
160 | taken for each individual SCSI-subsystem found, which are: | |
161 | ||
162 | Offset Type Permissions | |
163 | 0 Command Interface Register 1 Read/Write | |
164 | 1 Command Interface Register 2 Read/Write | |
165 | 2 Command Interface Register 3 Read/Write | |
166 | 3 Command Interface Register 4 Read/Write | |
167 | 4 Attention Register Read/Write | |
168 | 5 Basic Control Register Read/Write | |
169 | 6 Interrupt Status Register Read | |
170 | 7 Basic Status Register Read | |
171 | ||
172 | After the I/O-address range is assigned, the host-adapter is assigned | |
173 | to a local structure which keeps all adapter information needed for the | |
174 | driver itself and the mid- and higher-level SCSI-drivers. The SCSI pun/lun | |
175 | and the adapters' ldn tables are initialized and get probed afterwards by | |
176 | the check_devices() function. If no further adapters are found, | |
177 | ibmmca_detect() quits. | |
178 | ||
179 | 2.2 Physical Units, Logical Units, and Logical Devices | |
180 | ------------------------------------------------------ | |
181 | There can be up to 56 devices on the SCSI bus (besides the adapter): | |
182 | there are up to 7 "physical units" (each identified by physical unit | |
183 | number or pun, also called the scsi id, this is the number you select | |
184 | with hardware jumpers), and each physical unit can have up to 8 | |
185 | "logical units" (each identified by logical unit number, or lun, | |
186 | between 0 and 7). The IBM SCSI-2 F/W adapter offers this on up to two | |
187 | busses and provides support for 30 logical devices at the same time, where | |
188 | in wide-addressing mode you can have 16 puns with 32 luns on each device. | |
01dd2fbf | 189 | This section describes the handling of devices on non-F/W adapters. |
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190 | Just imagine, that you can have 16 * 32 = 512 devices on a F/W adapter |
191 | which means a lot of possible devices for such a small machine. | |
192 | ||
193 | Typically the adapter has pun=7, so puns of other physical units | |
194 | are between 0 and 6(15). On a wide-adapter a pun higher than 7 is | |
195 | possible, but is normally not used. Almost all physical units have only | |
196 | one logical unit, with lun=0. A CD-ROM jukebox would be an example of a | |
197 | physical unit with more than one logical unit. | |
198 | ||
199 | The embedded microprocessor of the IBM SCSI-subsystem hides the complex | |
200 | two-dimensional (pun,lun) organization from the operating system. | |
201 | When the machine is powered-up (or rebooted), the embedded microprocessor | |
202 | checks, on its own, all 56 possible (pun,lun) combinations, and the first | |
203 | 15 devices found are assigned into a one-dimensional array of so-called | |
204 | "logical devices", identified by "logical device numbers" or ldn. The last | |
205 | ldn=15 is reserved for the subsystem itself. Wide adapters may have | |
206 | to check up to 15 * 8 = 120 pun/lun combinations. | |
207 | ||
208 | 2.3 SCSI-Device Recognition and Dynamical ldn Assignment | |
209 | -------------------------------------------------------- | |
210 | One consequence of information hiding is that the real (pun,lun) | |
211 | numbers are also hidden. The two possibilities to get around this problem | |
01dd2fbf | 212 | are to offer fake pun/lun combinations to the operating system or to |
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213 | delete the whole mapping of the adapter and to reassign the ldns, using |
214 | the immediate assign command of the SCSI-subsystem for probing through | |
01dd2fbf | 215 | all possible pun/lun combinations. An ldn is a "logical device number" |
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216 | which is used by IBM SCSI-subsystems to access some valid SCSI-device. |
217 | At the beginning of the development of this driver, the following approach | |
218 | was used: | |
219 | ||
220 | First, the driver checked the ldn's (0 to 6) to find out which ldn's | |
221 | have devices assigned. This was done by the functions check_devices() and | |
222 | device_exists(). The interrupt handler has a special paragraph of code | |
223 | (see local_checking_phase_flag) to assist in the checking. Assume, for | |
224 | example, that three logical devices were found assigned at ldn 0, 1, 2. | |
225 | These are presented to the upper layer of Linux SCSI driver | |
226 | as devices with bogus (pun, lun) equal to (0,0), (1,0), (2,0). | |
227 | On the other hand, if the upper layer issues a command to device | |
228 | say (4,0), this driver returns DID_NO_CONNECT error. | |
229 | ||
230 | In a second step of the driver development, the following improvement has | |
231 | been applied: The first approach limited the number of devices to 7, far | |
2fe0ae78 | 232 | fewer than the 15 that it could use, then it just mapped ldn -> |
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233 | (ldn/8,ldn%8) for pun,lun. We ended up with a real mishmash of puns |
234 | and luns, but it all seemed to work. | |
235 | ||
236 | The latest development, which is implemented from the driver version 3.0 | |
237 | and later, realizes the device recognition in the following way: | |
238 | The physical SCSI-devices on the SCSI-bus are probed via immediate_assign- | |
239 | and device_inquiry-commands, that is all implemented in a completely new | |
240 | made check_devices() subroutine. This delivers an exact map of the physical | |
241 | SCSI-world that is now stored in the get_scsi[][]-array. This means, | |
242 | that the once hidden pun,lun assignment is now known to this driver. | |
243 | It no longer believes in default-settings of the subsystem and maps all | |
244 | ldns to existing pun,lun "by foot". This assures full control of the ldn | |
245 | mapping and allows dynamical remapping of ldns to different pun,lun, if | |
246 | there are more SCSI-devices installed than ldns available (n>15). The | |
247 | ldns from 0 to 6 get 'hardwired' by this driver to puns 0 to 7 at lun=0, | |
248 | excluding the pun of the subsystem. This assures, that at least simple | |
249 | SCSI-installations have optimum access-speed and are not touched by | |
250 | dynamical remapping. The ldns 7 to 14 are put to existing devices with | |
251 | lun>0 or to non-existing devices, in order to satisfy the subsystem, if | |
252 | there are less than 15 SCSI-devices connected. In the case of more than 15 | |
253 | devices, the dynamical mapping goes active. If the get_scsi[][] reports a | |
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254 | device to be existent, but it has no ldn assigned, it gets an ldn out of 7 |
255 | to 14. The numbers are assigned in cyclic order, therefore it takes 8 | |
256 | dynamical reassignments on the SCSI-devices until a certain device | |
2fe0ae78 | 257 | loses its ldn again. This assures that dynamical remapping is avoided |
1da177e4 | 258 | during intense I/O between up to 15 SCSI-devices (means pun,lun |
2fe0ae78 | 259 | combinations). A further advantage of this method is that people who |
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260 | build their kernel without probing on all luns will get what they expect, |
261 | because the driver just won't assign everything with lun>0 when | |
2fe0ae78 | 262 | multiple lun probing is inactive. |
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263 | |
264 | 2.4 SCSI-Device Order | |
265 | --------------------- | |
266 | Because of the now correct recognition of physical pun,lun, and | |
267 | their report to mid-level- and higher-level-drivers, the new reported puns | |
268 | can be different from the old, faked puns. Therefore, Linux will eventually | |
269 | change /dev/sdXXX assignments and prompt you for corrupted superblock | |
270 | repair on boottime. In this case DO NOT PANIC, YOUR DISKS ARE STILL OK!!! | |
271 | You have to reboot (CTRL-D) with an old kernel and set the /etc/fstab-file | |
272 | entries right. After that, the system should come up as errorfree as before. | |
273 | If your boot-partition is not coming up, also edit the /etc/lilo.conf-file | |
274 | in a Linux session booted on old kernel and run lilo before reboot. Check | |
275 | lilo.conf anyway to get boot on other partitions with foreign OSes right | |
276 | again. But there exists a feature of this driver that allows you to change | |
277 | the assignment order of the SCSI-devices by flipping the PUN-assignment. | |
278 | See the next paragraph for a description. | |
279 | ||
280 | The problem for this is, that Linux does not assign the SCSI-devices in the | |
281 | way as described in the ANSI-SCSI-standard. Linux assigns /dev/sda to | |
282 | the device with at minimum id 0. But the first drive should be at id 6, | |
283 | because for historical reasons, drive at id 6 has, by hardware, the highest | |
284 | priority and a drive at id 0 the lowest. IBM was one of the rare producers, | |
285 | where the BIOS assigns drives belonging to the ANSI-SCSI-standard. Most | |
286 | other producers' BIOS does not (I think even Adaptec-BIOS). The | |
287 | IBMMCA_SCSI_ORDER_STANDARD flag, which you set while configuring the | |
288 | kernel enables to choose the preferred way of SCSI-device-assignment. | |
289 | Defining this flag would result in Linux determining the devices in the | |
290 | same order as DOS and OS/2 does on your MCA-machine. This is also standard | |
291 | on most industrial computers and OSes, like e.g. OS-9. Leaving this flag | |
292 | undefined will get your devices ordered in the default way of Linux. See | |
293 | also the remarks of Chris Beauregard from Dec 15, 1997 and the followups | |
294 | in section 3. | |
295 | ||
296 | 2.5 Regular SCSI-Command-Processing | |
297 | ----------------------------------- | |
298 | Only three functions get involved: ibmmca_queuecommand(), issue_cmd(), | |
299 | and interrupt_handler(). | |
300 | ||
301 | The upper layer issues a scsi command by calling function | |
302 | ibmmca_queuecommand(). This function fills a "subsystem control block" | |
303 | (scb) and calls a local function issue_cmd(), which writes a scb | |
304 | command into subsystem I/O ports. Once the scb command is carried out, | |
305 | the interrupt_handler() is invoked. If a device is determined to be | |
25985edc | 306 | existent and it has not assigned any ldn, it gets one dynamically. |
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307 | For this, the whole stuff is done in ibmmca_queuecommand(). |
308 | ||
309 | 2.6 Abort & Reset Commands | |
310 | -------------------------- | |
311 | These are implemented with busy waiting for interrupt to arrive. | |
53cb4726 ML |
312 | ibmmca_reset() and ibmmca_abort() do not work sufficiently well |
313 | up to now and need still a lot of development work. This seems | |
314 | to be a problem with other low-level SCSI drivers too, however | |
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315 | this should be no excuse. |
316 | ||
317 | 2.7 Disk Geometry | |
318 | ----------------- | |
319 | The ibmmca_biosparams() function should return the same disk geometry | |
320 | as the bios. This is needed for fdisk, etc. The returned geometry is | |
321 | certainly correct for disks smaller than 1 gigabyte. In the meantime, | |
322 | it has been proved, that this works fine even with disks larger than | |
323 | 1 gigabyte. | |
324 | ||
325 | 2.8 Kernel Boot Option | |
326 | ---------------------- | |
327 | The function ibmmca_scsi_setup() is called if option ibmmcascsi=n | |
328 | is passed to the kernel. See file linux/init/main.c for details. | |
329 | ||
330 | 2.9 Driver Module Support | |
331 | ------------------------- | |
332 | Is implemented and tested by K. Kudielka. This could probably not work | |
333 | on kernels <2.1.0. | |
334 | ||
335 | 2.10 Multiple Hostadapter Support | |
336 | --------------------------------- | |
337 | This driver supports up to eight interfaces of type IBM-SCSI-Subsystem. | |
338 | Integrated-, and MCA-adapters are automatically recognized. Unrecognizable | |
339 | IBM-SCSI-Subsystem interfaces can be specified as kernel-parameters. | |
340 | ||
341 | 2.11 /proc/scsi-Filesystem Information | |
342 | -------------------------------------- | |
343 | Information about the driver condition is given in | |
344 | /proc/scsi/ibmmca/<host_no>. ibmmca_proc_info() provides this information. | |
345 | ||
346 | This table is quite informative for interested users. It shows the load | |
d533f671 | 347 | of commands on the subsystem and whether you are running the bypassed |
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348 | (software) or integrated (hardware) SCSI-command set (see below). The |
349 | amount of accesses is shown. Read, write, modeselect is shown separately | |
350 | in order to help debugging problems with CD-ROMs or tapedrives. | |
351 | ||
352 | The following table shows the list of 15 logical device numbers, that are | |
353 | used by the SCSI-subsystem. The load on each ldn is shown in the table, | |
354 | again, read and write commands are split. The last column shows the amount | |
355 | of reassignments, that have been applied to the ldns, if you have more than | |
356 | 15 pun/lun combinations available on the SCSI-bus. | |
357 | ||
358 | The last two tables show the pun/lun map and the positions of the ldns | |
359 | on this pun/lun map. This may change during operation, when a ldn is | |
360 | reassigned to another pun/lun combination. If the necessity for dynamical | |
361 | assignments is set to 'no', the ldn structure keeps static. | |
362 | ||
363 | 2.12 /proc/mca-Filesystem Information | |
364 | ------------------------------------- | |
365 | The slot-file contains all default entries and in addition chip and I/O- | |
366 | address information of the SCSI-subsystem. This information is provided | |
367 | by ibmmca_getinfo(). | |
368 | ||
369 | 2.13 Supported IBM SCSI-Subsystems | |
370 | ---------------------------------- | |
371 | The following IBM SCSI-subsystems are supported by this driver: | |
372 | ||
373 | - IBM Fast/Wide SCSI-2 Adapter | |
374 | - IBM 7568 Industrial Computer SCSI Adapter w/Cache | |
375 | - IBM Expansion Unit SCSI Controller | |
376 | - IBM SCSI Adapter w/Cache | |
377 | - IBM SCSI Adapter | |
378 | - IBM Integrated SCSI Controller | |
379 | - All clones, 100% compatible with the chipset and subsystem command | |
380 | system of IBM SCSI-adapters (forced detection) | |
381 | ||
382 | 2.14 Linux Kernel Versions | |
383 | -------------------------- | |
384 | The IBM SCSI-subsystem low level driver is prepared to be used with | |
385 | all versions of Linux between 2.0.x and 2.4.x. The compatibility checks | |
386 | are fully implemented up from version 3.1e of the driver. This means, that | |
387 | you just need the latest ibmmca.h and ibmmca.c file and copy it in the | |
388 | linux/drivers/scsi directory. The code is automatically adapted during | |
389 | kernel compilation. This is different from kernel 2.4.0! Here version | |
390 | 4.0 or later of the driver must be used for kernel 2.4.0 or later. Version | |
391 | 4.0 or later does not work together with older kernels! Driver versions | |
392 | older than 4.0 do not work together with kernel 2.4.0 or later. They work | |
393 | on all older kernels. | |
394 | ||
395 | 3 Code History | |
396 | -------------- | |
397 | Jan 15 1996: First public release. | |
398 | - Martin Kolinek | |
399 | ||
400 | Jan 23 1996: Scrapped code which reassigned scsi devices to logical | |
401 | device numbers. Instead, the existing assignment (created | |
402 | when the machine is powered-up or rebooted) is used. | |
403 | A side effect is that the upper layer of Linux SCSI | |
404 | device driver gets bogus scsi ids (this is benign), | |
405 | and also the hard disks are ordered under Linux the | |
406 | same way as they are under dos (i.e., C: disk is sda, | |
407 | D: disk is sdb, etc.). | |
408 | - Martin Kolinek | |
409 | ||
410 | I think that the CD-ROM is now detected only if a CD is | |
411 | inside CD_ROM while Linux boots. This can be fixed later, | |
412 | once the driver works on all types of PS/2's. | |
413 | - Martin Kolinek | |
414 | ||
415 | Feb 7 1996: Modified biosparam function. Fixed the CD-ROM detection. | |
416 | For now, devices other than harddisk and CD_ROM are | |
417 | ignored. Temporarily modified abort() function | |
418 | to behave like reset(). | |
419 | - Martin Kolinek | |
420 | ||
421 | Mar 31 1996: The integrated scsi subsystem is correctly found | |
422 | in PS/2 models 56,57, but not in model 76. Therefore | |
423 | the ibmmca_scsi_setup() function has been added today. | |
424 | This function allows the user to force detection of | |
425 | scsi subsystem. The kernel option has format | |
426 | ibmmcascsi=n | |
427 | where n is the scsi_id (pun) of the subsystem. Most likely, n is 7. | |
428 | - Martin Kolinek | |
429 | ||
430 | Aug 21 1996: Modified the code which maps ldns to (pun,0). It was | |
431 | insufficient for those of us with CD-ROM changers. | |
432 | - Chris Beauregard | |
433 | ||
434 | Dec 14 1996: More improvements to the ldn mapping. See check_devices | |
435 | for details. Did more fiddling with the integrated SCSI detection, | |
436 | but I think it's ultimately hopeless without actually testing the | |
437 | model of the machine. The 56, 57, 76 and 95 (ultimedia) all have | |
438 | different integrated SCSI register configurations. However, the 56 | |
439 | and 57 are the only ones that have problems with forced detection. | |
440 | - Chris Beauregard | |
441 | ||
442 | Mar 8-16 1997: Modified driver to run as a module and to support | |
443 | multiple adapters. A structure, called ibmmca_hostdata, is now | |
444 | present, containing all the variables, that were once only | |
445 | available for one single adapter. The find_subsystem-routine has vanished. | |
446 | The hardware recognition is now done in ibmmca_detect directly. | |
447 | This routine checks for presence of MCA-bus, checks the interrupt | |
448 | level and continues with checking the installed hardware. | |
449 | Certain PS/2-models do not recognize a SCSI-subsystem automatically. | |
450 | Hence, the setup defined by command-line-parameters is checked first. | |
451 | Thereafter, the routine probes for an integrated SCSI-subsystem. | |
452 | Finally, adapters are checked. This method has the advantage to cover all | |
453 | possible combinations of multiple SCSI-subsystems on one MCA-board. Up to | |
454 | eight SCSI-subsystems can be recognized and announced to the upper-level | |
455 | drivers with this improvement. A set of defines made changes to other | |
456 | routines as small as possible. | |
457 | - Klaus Kudielka | |
458 | ||
459 | May 30 1997: (v1.5b) | |
460 | 1) SCSI-command capability enlarged by the recognition of MODE_SELECT. | |
461 | This needs the RD-Bit to be disabled on IM_OTHER_SCSI_CMD_CMD which | |
462 | allows data to be written from the system to the device. It is a | |
463 | necessary step to be allowed to set blocksize of SCSI-tape-drives and | |
4ae0edc2 | 464 | the tape-speed, without confusing the SCSI-Subsystem. |
1da177e4 LT |
465 | 2) The recognition of a tape is included in the check_devices routine. |
466 | This is done by checking for TYPE_TAPE, that is already defined in | |
467 | the kernel-scsi-environment. The markup of a tape is done in the | |
468 | global ldn_is_tape[] array. If the entry on index ldn | |
469 | is 1, there is a tapedrive connected. | |
470 | 3) The ldn_is_tape[] array is necessary to distinguish between tape- and | |
471 | other devices. Fixed blocklength devices should not cause a problem | |
472 | with the SCB-command for read and write in the ibmmca_queuecommand | |
473 | subroutine. Therefore, I only derivate the READ_XX, WRITE_XX for | |
474 | the tape-devices, as recommended by IBM in this Technical Reference, | |
475 | mentioned below. (IBM recommends to avoid using the read/write of the | |
476 | subsystem, but the fact was, that read/write causes a command error from | |
477 | the subsystem and this causes kernel-panic.) | |
478 | 4) In addition, I propose to use the ldn instead of a fix char for the | |
479 | display of PS2_DISK_LED_ON(). On 95, one can distinguish between the | |
480 | devices that are accessed. It shows activity and easyfies debugging. | |
481 | The tape-support has been tested with a SONY SDT-5200 and a HP DDS-2 | |
482 | (I do not know yet the type). Optimization and CD-ROM audio-support, | |
483 | I am working on ... | |
484 | - Michael Lang | |
485 | ||
486 | June 19 1997: (v1.6b) | |
487 | 1) Submitting the extra-array ldn_is_tape[] -> to the local ld[] | |
488 | device-array. | |
489 | 2) CD-ROM Audio-Play seems to work now. | |
490 | 3) When using DDS-2 (120M) DAT-Tapes, mtst shows still density-code | |
491 | 0x13 for ordinary DDS (61000 BPM) instead 0x24 for DDS-2. This appears | |
492 | also on Adaptec 2940 adaptor in a PCI-System. Therefore, I assume that | |
493 | the problem is independent of the low-level-driver/bus-architecture. | |
494 | 4) Hexadecimal ldn on PS/2-95 LED-display. | |
495 | 5) Fixing of the PS/2-LED on/off that it works right with tapedrives and | |
496 | does not confuse the disk_rw_in_progress counter. | |
497 | - Michael Lang | |
498 | ||
499 | June 21 1997: (v1.7b) | |
500 | 1) Adding of a proc_info routine to inform in /proc/scsi/ibmmca/<host> the | |
501 | outer-world about operational load statistics on the different ldns, | |
502 | seen by the driver. Everybody that has more than one IBM-SCSI should | |
503 | test this, because I only have one and cannot see what happens with more | |
504 | than one IBM-SCSI hosts. | |
505 | 2) Definition of a driver version-number to have a better recognition of | |
506 | the source when there are existing too much releases that may confuse | |
507 | the user, when reading about release-specific problems. Up to know, | |
508 | I calculated the version-number to be 1.7. Because we are in BETA-test | |
509 | yet, it is today 1.7b. | |
510 | 3) Sorry for the heavy bug I programmed on June 19 1997! After that, the | |
511 | CD-ROM did not work any more! The C7-command was a fake impression | |
512 | I got while programming. Now, the READ and WRITE commands for CD-ROM are | |
513 | no longer running over the subsystem, but just over | |
514 | IM_OTHER_SCSI_CMD_CMD. On my observations (PS/2-95), now CD-ROM mounts | |
515 | much faster(!) and hopefully all fancy multimedia-functions, like direct | |
516 | digital recording from audio-CDs also work. (I tried it with cdda2wav | |
517 | from the cdwtools-package and it filled up the harddisk immediately :-).) | |
518 | To easify boolean logics, a further local device-type in ld[], called | |
519 | is_cdrom has been included. | |
520 | 4) If one uses a SCSI-device of unsupported type/commands, one | |
521 | immediately runs into a kernel-panic caused by Command Error. To better | |
522 | understand which SCSI-command caused the problem, I extended this | |
523 | specific panic-message slightly. | |
524 | - Michael Lang | |
525 | ||
526 | June 25 1997: (v1.8b) | |
d9195881 | 527 | 1) Some cosmetic changes for the handling of SCSI-device-types. |
1da177e4 LT |
528 | Now, also CD-Burners / WORMs and SCSI-scanners should work. For |
529 | MO-drives I have no experience, therefore not yet supported. | |
530 | In logical_devices I changed from different type-variables to one | |
531 | called 'device_type' where the values, corresponding to scsi.h, | |
532 | of a SCSI-device are stored. | |
533 | 2) There existed a small bug, that maps a device, coming after a SCSI-tape | |
534 | wrong. Therefore, e.g. a CD-ROM changer would have been mapped wrong | |
535 | -> problem removed. | |
536 | 3) Extension of the logical_device structure. Now it contains also device, | |
537 | vendor and revision-level of a SCSI-device for internal usage. | |
538 | - Michael Lang | |
539 | ||
540 | June 26-29 1997: (v2.0b) | |
541 | 1) The release number 2.0b is necessary because of the completely new done | |
542 | recognition and handling of SCSI-devices with the adapter. As I got | |
543 | from Chris the hint, that the subsystem can reassign ldns dynamically, | |
544 | I remembered this immediate_assign-command, I found once in the handbook. | |
545 | Now, the driver first kills all ldn assignments that are set by default | |
546 | on the SCSI-subsystem. After that, it probes on all puns and luns for | |
547 | devices by going through all combinations with immediate_assign and | |
548 | probing for devices, using device_inquiry. The found physical(!) pun,lun | |
549 | structure is stored in get_scsi[][] as device types. This is followed | |
550 | by the assignment of all ldns to existing SCSI-devices. If more ldns | |
551 | than devices are available, they are assigned to non existing pun,lun | |
552 | combinations to satisfy the adapter. With this, the dynamical mapping | |
553 | was possible to implement. (For further info see the text in the | |
01dd2fbf | 554 | source code and in the description below. Read the description |
1da177e4 LT |
555 | below BEFORE installing this driver on your system!) |
556 | 2) Changed the name IBMMCA_DRIVER_VERSION to IBMMCA_SCSI_DRIVER_VERSION. | |
557 | 3) The LED-display shows on PS/2-95 no longer the ldn, but the SCSI-ID | |
558 | (pun) of the accessed SCSI-device. This is now senseful, because the | |
559 | pun known within the driver is exactly the pun of the physical device | |
560 | and no longer a fake one. | |
561 | 4) The /proc/scsi/ibmmca/<host_no> consists now of the first part, where | |
562 | hit-statistics of ldns is shown and a second part, where the maps of | |
563 | physical and logical SCSI-devices are displayed. This could be very | |
564 | interesting, when one is using more than 15 SCSI-devices in order to | |
565 | follow the dynamical remapping of ldns. | |
566 | - Michael Lang | |
567 | ||
568 | June 26-29 1997: (v2.0b-1) | |
569 | 1) I forgot to switch the local_checking_phase_flag to 1 and back to 0 | |
570 | in the dynamical remapping part in ibmmca_queuecommand for the | |
571 | device_exist routine. Sorry. | |
572 | - Michael Lang | |
573 | ||
574 | July 1-13 1997: (v3.0b,c) | |
575 | 1) Merging of the driver-developments of Klaus Kudielka and Michael Lang | |
576 | in order to get a optimum and unified driver-release for the | |
577 | IBM-SCSI-Subsystem-Adapter(s). | |
578 | For people, using the Kernel-release >=2.1.0, module-support should | |
579 | be no problem. For users, running under <2.1.0, module-support may not | |
580 | work, because the methods have changed between 2.0.x and 2.1.x. | |
581 | 2) Added some more effective statistics for /proc-output. | |
582 | 3) Change typecasting at necessary points from (unsigned long) to | |
583 | virt_to_bus(). | |
584 | 4) Included #if... at special points to have specific adaption of the | |
585 | driver to kernel 2.0.x and 2.1.x. It should therefore also run with | |
586 | later releases. | |
587 | 5) Magneto-Optical drives and medium-changers are also recognized, now. | |
588 | Therefore, we have a completely gapfree recognition of all SCSI- | |
589 | device-types, that are known by Linux up to kernel 2.1.31. | |
590 | 6) The flag SCSI_IBMMCA_DEV_RESET has been inserted. If it is set within | |
591 | the configuration, each connected SCSI-device will get a reset command | |
592 | during boottime. This can be necessary for some special SCSI-devices. | |
593 | This flag should be included in Config.in. | |
594 | (See also the new Config.in file.) | |
595 | Probable next improvement: bad disk handler. | |
596 | - Michael Lang | |
597 | ||
598 | Sept 14 1997: (v3.0c) | |
599 | 1) Some debugging and speed optimization applied. | |
600 | - Michael Lang | |
601 | ||
602 | Dec 15, 1997 | |
603 | - chrisb@truespectra.com | |
604 | - made the front panel display thingy optional, specified from the | |
605 | command-line via ibmmcascsi=display. Along the lines of the /LED | |
606 | option for the OS/2 driver. | |
607 | - fixed small bug in the LED display that would hang some machines. | |
608 | - reversed ordering of the drives (using the | |
609 | IBMMCA_SCSI_ORDER_STANDARD define). This is necessary for two main | |
610 | reasons: | |
611 | - users who've already installed Linux won't be screwed. Keep | |
612 | in mind that not everyone is a kernel hacker. | |
613 | - be consistent with the BIOS ordering of the drives. In the | |
614 | BIOS, id 6 is C:, id 0 might be D:. With this scheme, they'd be | |
615 | backwards. This confuses the crap out of those heathens who've | |
616 | got a impure Linux installation (which, <wince>, I'm one of). | |
617 | This whole problem arises because IBM is actually non-standard with | |
618 | the id to BIOS mappings. You'll find, in fdomain.c, a similar | |
619 | comment about a few FD BIOS revisions. The Linux (and apparently | |
620 | industry) standard is that C: maps to scsi id (0,0). Let's stick | |
621 | with that standard. | |
622 | - Since this is technically a branch of my own, I changed the | |
623 | version number to 3.0e-cpb. | |
624 | ||
625 | Jan 17, 1998: (v3.0f) | |
626 | 1) Addition of some statistical info for /proc in proc_info. | |
627 | 2) Taking care of the SCSI-assignment problem, dealed by Chris at Dec 15 | |
628 | 1997. In fact, IBM is right, concerning the assignment of SCSI-devices | |
629 | to driveletters. It is conform to the ANSI-definition of the SCSI- | |
630 | standard to assign drive C: to SCSI-id 6, because it is the highest | |
631 | hardware priority after the hostadapter (that has still today by | |
632 | default everywhere id 7). Also realtime-operating systems that I use, | |
633 | like LynxOS and OS9, which are quite industrial systems use top-down | |
634 | numbering of the harddisks, that is also starting at id 6. Now, one | |
635 | sits a bit between two chairs. On one hand side, using the define | |
636 | IBMMCA_SCSI_ORDER_STANDARD makes Linux assigning disks conform to | |
637 | the IBM- and ANSI-SCSI-standard and keeps this driver downward | |
638 | compatible to older releases, on the other hand side, people is quite | |
639 | habituated in believing that C: is assigned to (0,0) and much other | |
640 | SCSI-BIOS do so. Therefore, I moved the IBMMCA_SCSI_ORDER_STANDARD | |
641 | define out of the driver and put it into Config.in as subitem of | |
642 | 'IBM SCSI support'. A help, added to Documentation/Configure.help | |
643 | explains the differences between saying 'y' or 'n' to the user, when | |
644 | IBMMCA_SCSI_ORDER_STANDARD prompts, so the ordinary user is enabled to | |
645 | choose the way of assignment, depending on his own situation and gusto. | |
646 | 3) Adapted SCSI_IBMMCA_DEV_RESET to the local naming convention, so it is | |
647 | now called IBMMCA_SCSI_DEV_RESET. | |
648 | 4) Optimization of proc_info and its subroutines. | |
649 | 5) Added more in-source-comments and extended the driver description by | |
650 | some explanation about the SCSI-device-assignment problem. | |
651 | - Michael Lang | |
652 | ||
653 | Jan 18, 1998: (v3.0g) | |
654 | 1) Correcting names to be absolutely conform to the later 2.1.x releases. | |
655 | This is necessary for | |
656 | IBMMCA_SCSI_DEV_RESET -> CONFIG_IBMMCA_SCSI_DEV_RESET | |
657 | IBMMCA_SCSI_ORDER_STANDARD -> CONFIG_IBMMCA_SCSI_ORDER_STANDARD | |
658 | - Michael Lang | |
659 | ||
660 | Jan 18, 1999: (v3.1 MCA-team internal) | |
661 | 1) The multiple hosts structure is accessed from every subroutine, so there | |
662 | is no longer the address of the device structure passed from function | |
663 | to function, but only the hostindex. A call by value, nothing more. This | |
664 | should really be understood by the compiler and the subsystem should get | |
665 | the right values and addresses. | |
666 | 2) The SCSI-subsystem detection was not complete and quite hugely buggy up | |
667 | to now, compared to the technical manual. The interpretation of the pos2 | |
668 | register is not as assumed by people before, therefore, I dropped a note | |
669 | in the ibmmca_detect function to show the registers' interpretation. | |
670 | The pos-registers of integrated SCSI-subsystems do not contain any | |
671 | information concerning the IO-port offset, really. Instead, they contain | |
672 | some info about the adapter, the chip, the NVRAM .... The I/O-port is | |
673 | fixed to 0x3540 - 0x3547. There can be more than one adapters in the | |
674 | slots and they get an offset for the I/O area in order to get their own | |
675 | I/O-address area. See chapter 2 for detailed description. At least, the | |
676 | detection should now work right, even on models other than 95. The 95ers | |
677 | came happily around the bug, as their pos2 register contains always 0 | |
678 | in the critical area. Reserved bits are not allowed to be interpreted, | |
679 | therefore, IBM is allowed to set those bits as they like and they may | |
680 | really vary between different PS/2 models. So, now, no interpretation | |
681 | of reserved bits - hopefully no trouble here anymore. | |
682 | 3) The command error, which you may get on models 55, 56, 57, 70, 77 and | |
683 | P70 may have been caused by the fact, that adapters of older design do | |
684 | not like sending commands to non-existing SCSI-devices and will react | |
685 | with a command error as a sign of protest. While this error is not | |
686 | present on IBM SCSI Adapter w/cache, it appears on IBM Integrated SCSI | |
53cb4726 ML |
687 | Adapters. Therefore, I implemented a workaround to forgive those |
688 | adapters their protests, but it is marked up in the statistics, so | |
1da177e4 LT |
689 | after a successful boot, you can see in /proc/scsi/ibmmca/<host_number> |
690 | how often the command errors have been forgiven to the SCSI-subsystem. | |
691 | If the number is bigger than 0, you have a SCSI subsystem of older | |
692 | design, what should no longer matter. | |
693 | 4) ibmmca_getinfo() has been adapted very carefully, so it shows in the | |
694 | slotn file really, what is senseful to be presented. | |
695 | 5) ibmmca_register() has been extended in its parameter list in order to | |
696 | pass the right name of the SCSI-adapter to Linux. | |
697 | - Michael Lang | |
698 | ||
699 | Feb 6, 1999: (v3.1) | |
700 | 1) Finally, after some 3.1Beta-releases, the 3.1 release. Sorry, for | |
701 | the delayed release, but it was not finished with the release of | |
702 | Kernel 2.2.0. | |
703 | - Michael Lang | |
704 | ||
705 | Feb 10, 1999 (v3.1) | |
706 | 1) Added a new commandline parameter called 'bypass' in order to bypass | |
707 | every integrated subsystem SCSI-command consequently in case of | |
708 | troubles. | |
709 | 2) Concatenated read_capacity requests to the harddisks. It gave a lot | |
710 | of troubles with some controllers and after I wanted to apply some | |
711 | extensions, it jumped out in the same situation, on my w/cache, as like | |
712 | on D. Weinehalls' Model 56, having integrated SCSI. This gave me the | |
5d3f083d ML |
713 | decisive hint to move the code-part out and declare it global. Now |
714 | it seems to work far better and more stable. Let us see what | |
1da177e4 LT |
715 | the world thinks of it... |
716 | 3) By the way, only Sony DAT-drives seem to show density code 0x13. A | |
717 | test with a HP drive gave right results, so the problem is vendor- | |
718 | specific and not a problem of the OS or the driver. | |
719 | - Michael Lang | |
720 | ||
721 | Feb 18, 1999 (v3.1d) | |
722 | 1) The abort command and the reset function have been checked for | |
723 | inconsistencies. From the logical point of thinking, they work | |
724 | at their optimum, now, but as the subsystem does not answer with an | |
725 | interrupt, abort never finishes, sigh... | |
726 | 2) Everything, that is accessed by a busmaster request from the adapter | |
727 | is now declared as global variable, even the return-buffer in the | |
728 | local checking phase. This assures, that no accesses to undefined memory | |
729 | areas are performed. | |
730 | 3) In ibmmca.h, the line unchecked_isa_dma is added with 1 in order to | |
731 | avoid memory-pointers for the areas higher than 16MByte in order to | |
732 | be sure, it also works on 16-Bit Microchannel bus systems. | |
733 | 4) A lot of small things have been found, but nothing that endangered the | |
734 | driver operations. Just it should be more stable, now. | |
735 | - Michael Lang | |
736 | ||
737 | Feb 20, 1999 (v3.1e) | |
738 | 1) I took the warning from the Linux Kernel Hackers Guide serious and | |
739 | checked the cmd->result return value to the done-function very carefully. | |
740 | It is obvious, that the IBM SCSI only delivers the tsb.dev_status, if | |
741 | some error appeared, else it is undefined. Now, this is fixed. Before | |
742 | any SCB command gets queued, the tsb.dev_status is set to 0, so the | |
743 | cmd->result won't screw up Linux higher level drivers. | |
25985edc | 744 | 2) The reset-function has slightly improved. This is still planned for |
1da177e4 LT |
745 | abort. During the abort and the reset function, no interrupts are |
746 | allowed. This is however quite hard to cope with, so the INT-status | |
747 | register is read. When the interrupt gets queued, one can find its | |
748 | status immediately on that register and is enabled to continue in the | |
749 | reset function. I had no chance to test this really, only in a bogus | |
750 | situation, I got this function running, but the situation was too much | |
751 | worse for Linux :-(, so tests will continue. | |
752 | 3) Buffers got now consistent. No open address mapping, as before and | |
753 | therefore no further troubles with the unassigned memory segmentation | |
754 | faults that scrambled probes on 95XX series and even on 85XX series, | |
755 | when the kernel is done in a not so perfectly fitting way. | |
756 | 4) Spontaneous interrupts from the subsystem, appearing without any | |
757 | command previously queued are answered with a DID_BAD_INTR result. | |
758 | 5) Taken into account ZP Gus' proposals to reverse the SCSI-device | |
759 | scan order. As it does not work on Kernel 2.1.x or 2.2.x, as proposed | |
760 | by him, I implemented it in a slightly derived way, which offers in | |
761 | addition more flexibility. | |
762 | - Michael Lang | |
763 | ||
764 | Apr 23, 2000 (v3.2pre1) | |
01dd2fbf | 765 | 1) During a very long time, I collected a huge amount of bug reports from |
1da177e4 | 766 | various people, trying really quite different things on their SCSI- |
01dd2fbf | 767 | PS/2s. Today, all these bug reports are taken into account and should be |
1da177e4 LT |
768 | mostly solved. The major topics were: |
769 | - Driver crashes during boottime by no obvious reason. | |
770 | - Driver panics while the midlevel-SCSI-driver is trying to inquire | |
771 | the SCSI-device properties, even though hardware is in perfect state. | |
772 | - Displayed info for the various slot-cards is interpreted wrong. | |
773 | The main reasons for the crashes were two: | |
774 | 1) The commands to check for device information like INQUIRY, | |
775 | TEST_UNIT_READY, REQUEST_SENSE and MODE_SENSE cause the devices | |
776 | to deliver information of up to 255 bytes. Midlevel drivers offer | |
777 | 1024 bytes of space for the answer, but the IBM-SCSI-adapters do | |
778 | not accept this, as they stick quite near to ANSI-SCSI and report | |
779 | a COMMAND_ERROR message which causes the driver to panic. The main | |
780 | problem was located around the INQUIRY command. Now, for all the | |
53cb4726 | 781 | mentioned commands, the buffersize sent to the adapter is at |
1da177e4 | 782 | maximum 255 which seems to be a quite reasonable solution. |
53cb4726 | 783 | TEST_UNIT_READY gets a buffersize of 0 to make sure that no |
1da177e4 | 784 | data is transferred in order to avoid any possible command failure. |
53cb4726 ML |
785 | 2) On unsuccessful TEST_UNIT_READY, the mid-level driver has to send |
786 | a REQUEST_SENSE in order to see where the problem is located. This | |
1da177e4 | 787 | REQUEST_SENSE may have various length in its answer-buffer. IBM |
53cb4726 ML |
788 | SCSI-subsystems report a command failure if the returned buffersize |
789 | is different from the sent buffersize, but this can be suppressed by | |
1da177e4 LT |
790 | a special bit, which is now done and problems seem to be solved. |
791 | 2) Code adaption to all kernel-releases. Now, the 3.2 code compiles on | |
792 | 2.0.x, 2.1.x, 2.2.x and 2.3.x kernel releases without any code-changes. | |
793 | 3) Commandline-parameters are recognized again, even under Kernel 2.3.x or | |
794 | higher. | |
795 | - Michael Lang | |
796 | ||
797 | April 27, 2000 (v3.2pre2) | |
798 | 1) Bypassed commands get read by the adapter by one cycle instead of two. | |
799 | This increases SCSI-performance. | |
800 | 2) Synchronous datatransfer is provided for sure to be 5 MHz on older | |
801 | SCSI and 10 MHz on internal F/W SCSI-adapter. | |
802 | 3) New commandline parameters allow to force the adapter to slow down while | |
803 | in synchronous transfer. Could be helpful for very old devices. | |
804 | - Michael Lang | |
805 | ||
806 | June 2, 2000 (v3.2pre5) | |
807 | 1) Added Jim Shorney's contribution to make the activity indicator | |
808 | flashing in addition to the LED-alphanumeric display-panel on | |
809 | models 95A. To be enabled to choose this feature freely, a new | |
810 | commandline parameter is added, called 'activity'. | |
811 | 2) Added the READ_CONTROL bit for test_unit_ready SCSI-command. | |
812 | 3) Added some suppress_exception bits to read_device_capacity and | |
813 | all device_inquiry occurrences in the driver code. | |
814 | 4) Complaints about the various KERNEL_VERSION implementations are | |
815 | taken into account. Every local_LinuxKernelVersion occurrence is | |
816 | now replaced by KERNEL_VERSION, defined in linux/version.h. | |
817 | Corresponding changes were applied to ibmmca.h, too. This was a | |
818 | contribution to all kernel-parts by Philipp Hahn. | |
819 | - Michael Lang | |
820 | ||
821 | July 17, 2000 (v3.2pre8) | |
01dd2fbf | 822 | A long period of collecting bug reports from all corners of the world |
1da177e4 LT |
823 | now lead to the following corrections to the code: |
824 | 1) SCSI-2 F/W support crashed with a COMMAND ERROR. The reason for this | |
5d3f083d ML |
825 | was that it is possible to disable Fast-SCSI for the external bus. |
826 | The feature-control command, where this crash appeared regularly, tried | |
1da177e4 | 827 | to set the maximum speed of 10MHz synchronous transfer speed and that |
5d3f083d | 828 | reports a COMMAND ERROR if external bus Fast-SCSI is disabled. Now, |
1da177e4 LT |
829 | the feature-command probes down from maximum speed until the adapter |
830 | stops to complain, which is at the same time the maximum possible | |
831 | speed selected in the reference program. So, F/W external can run at | |
832 | 5 MHz (slow-) or 10 MHz (fast-SCSI). During feature probing, the | |
833 | COMMAND ERROR message is used to detect if the adapter does not complain. | |
834 | 2) Up to now, only combined busmode is supported, if you use external | |
835 | SCSI-devices, attached to the F/W-controller. If dual bus is selected, | |
836 | only the internal SCSI-devices get accessed by Linux. For most | |
837 | applications, this should do fine. | |
838 | 3) Wide-SCSI-addressing (16-Bit) is now possible for the internal F/W | |
839 | bus on the F/W adapter. If F/W adapter is detected, the driver | |
840 | automatically uses the extended PUN/LUN <-> LDN mapping tables, which | |
841 | are now new from 3.2pre8. This allows PUNs between 0 and 15 and should | |
842 | provide more fun with the F/W adapter. | |
843 | 4) Several machines use the SCSI: POS registers for internal/undocumented | |
844 | storage of system relevant info. This confused the driver, mainly on | |
845 | models 9595, as it expected no onboard SCSI only, if all POS in | |
846 | the integrated SCSI-area are set to 0x00 or 0xff. Now, the mechanism | |
847 | to check for integrated SCSI is much more restrictive and these problems | |
848 | should be history. | |
849 | - Michael Lang | |
850 | ||
851 | July 18, 2000 (v3.2pre9) | |
852 | This develop rather quickly at the moment. Two major things were still | |
853 | missing in 3.2pre8: | |
854 | 1) The adapter PUN for F/W adapters has 4-bits, while all other adapters | |
855 | have 3-bits. This is now taken into account for F/W. | |
856 | 2) When you select CONFIG_IBMMCA_SCSI_ORDER_STANDARD, you should | |
857 | normally get the inverse probing order of your devices on the SCSI-bus. | |
858 | The ANSI device order gets scrambled in version 3.2pre8!! Now, a new | |
859 | and tested algorithm inverts the device-order on the SCSI-bus and | |
860 | automatically avoids accidental access to whatever SCSI PUN the adapter | |
861 | is set and works with SCSI- and Wide-SCSI-addressing. | |
862 | - Michael Lang | |
863 | ||
864 | July 23, 2000 (v3.2pre10 unpublished) | |
865 | 1) LED panel display supports wide-addressing in ibmmca=display mode. | |
866 | 2) Adapter-information and autoadaption to address-space is done. | |
867 | 3) Auto-probing for maximum synchronous SCSI transfer rate is working. | |
868 | 4) Optimization to some embedded function calls is applied. | |
869 | 5) Added some comment for the user to wait for SCSI-devices being probed. | |
870 | 6) Finished version 3.2 for Kernel 2.4.0. It least, I thought it is but... | |
871 | - Michael Lang | |
872 | ||
873 | July 26, 2000 (v3.2pre11) | |
874 | 1) I passed a horrible weekend getting mad with NMIs on kernel 2.2.14 and | |
875 | a model 9595. Asking around in the community, nobody except of me has | |
01dd2fbf | 876 | seen such errors. Weird, but I am trying to recompile everything on |
1da177e4 LT |
877 | the model 9595. Maybe, as I use a specially modified gcc, that could |
878 | cause problems. But, it was not the reason. The true background was, | |
879 | that the kernel was compiled for i386 and the 9595 has a 486DX-2. | |
880 | Normally, no troubles should appear, but for this special machine, | |
881 | only the right processor support is working fine! | |
882 | 2) Previous problems with synchronous speed, slowing down from one adapter | |
883 | to the next during probing are corrected. Now, local variables store | |
884 | the synchronous bitmask for every single adapter found on the MCA bus. | |
885 | 3) LED alphanumeric panel support for XX95 systems is now showing some | |
886 | alive rotator during boottime. This makes sense, when no monitor is | |
887 | connected to the system. You can get rid of all display activity, if | |
888 | you do not use any parameter or just ibmmcascsi=activity, for the | |
01dd2fbf | 889 | harddrive activity LED, existent on all PS/2, except models 8595-XXX. |
1da177e4 LT |
890 | If no monitor is available, please use ibmmcascsi=display, which works |
891 | fine together with the linuxinfo utility for the LED-panel. | |
892 | - Michael Lang | |
893 | ||
894 | July 29, 2000 (v3.2) | |
895 | 1) Submission of this driver for kernel 2.4test-XX and 2.2.17. | |
896 | - Michael Lang | |
897 | ||
898 | December 28, 2000 (v3.2d / v4.0) | |
899 | 1) The interrupt handler had some wrong statement to wait for. This | |
900 | was done due to experimental reasons during 3.2 development but it | |
901 | has shown that this is not stable enough. Going back to wait for the | |
902 | adapter to be not busy is best. | |
903 | 2) Inquiry requests can be shorter than 255 bytes of return buffer. Due | |
904 | to a bug in the ibmmca_queuecommand routine, this buffer was forced | |
905 | to 255 at minimum. If the memory address, this return buffer is pointing | |
906 | to does not offer more space, invalid memory accesses destabilized the | |
907 | kernel. | |
908 | 3) version 4.0 is only valid for kernel 2.4.0 or later. This is necessary | |
909 | to remove old kernel version dependent waste from the driver. 3.2d is | |
910 | only distributed with older kernels but keeps compatibility with older | |
911 | kernel versions. 4.0 and higher versions cannot be used with older | |
912 | kernels anymore!! You must have at least kernel 2.4.0!! | |
913 | 4) The commandline argument 'bypass' and all its functionality got removed | |
914 | in version 4.0. This was never really necessary, as all troubles were | |
915 | based on non-command related reasons up to now, so bypassing commands | |
916 | did not help to avoid any bugs. It is kept in 3.2X for debugging reasons. | |
d9195881 | 917 | 5) Dynamic reassignment of ldns was again verified and analyzed to be |
1da177e4 LT |
918 | completely inoperational. This is corrected and should work now. |
919 | 6) All commands that get sent to the SCSI adapter were verified and | |
920 | completed in such a way, that they are now completely conform to the | |
921 | demands in the technical description of IBM. Main candidates were the | |
922 | DEVICE_INQUIRY, REQUEST_SENSE and DEVICE_CAPACITY commands. They must | |
fa00e7e1 | 923 | be transferred by bypassing the internal command buffer of the adapter |
1da177e4 LT |
924 | or else the response can be a random result. GET_POS_INFO would be more |
925 | safe in usage, if one could use the SUPRESS_EXCEPTION_SHORT, but this | |
926 | is not allowed by the technical references of IBM. (Sorry, folks, the | |
927 | model 80 problem is still a task to be solved in a different way.) | |
928 | 7) v3.2d is still hold back for some days for testing, while 4.0 is | |
929 | released. | |
930 | - Michael Lang | |
931 | ||
932 | January 3, 2001 (v4.0a) | |
933 | 1) A lot of complains after the 2.4.0-prerelease kernel came in about | |
934 | the impossibility to compile the driver as a module. This problem is | |
935 | solved. In combination with that problem, some unprecise declaration | |
936 | of the function option_setup() gave some warnings during compilation. | |
937 | This is solved, too by a forward declaration in ibmmca.c. | |
938 | 2) #ifdef argument concerning CONFIG_SCSI_IBMMCA is no longer needed and | |
939 | was entirely removed. | |
940 | 3) Some switch statements got optimized in code, as some minor variables | |
941 | in internal SCSI-command handlers. | |
942 | - Michael Lang | |
943 | ||
944 | 4 To do | |
945 | ------- | |
946 | - IBM SCSI-2 F/W external SCSI bus support in separate mode! | |
947 | - It seems that the handling of bad disks is really bad - | |
948 | non-existent, in fact. However, a low-level driver cannot help | |
949 | much, if such things happen. | |
950 | ||
951 | 5 Users' Manual | |
952 | --------------- | |
953 | 5.1 Commandline Parameters | |
954 | -------------------------- | |
955 | There exist several features for the IBM SCSI-subsystem driver. | |
956 | The commandline parameter format is: | |
957 | ||
958 | ibmmcascsi=<command1>,<command2>,<command3>,... | |
959 | ||
960 | where commandN can be one of the following: | |
961 | ||
962 | display Owners of a model 95 or other PS/2 systems with an | |
963 | alphanumeric LED display may set this to have their | |
964 | display showing the following output of the 8 digits: | |
965 | ||
966 | ------DA | |
967 | ||
968 | where '-' stays dark, 'D' shows the SCSI-device id | |
969 | and 'A' shows the SCSI hostindex, being currently | |
970 | accessed. During boottime, this will give the message | |
971 | ||
972 | SCSIini* | |
973 | ||
974 | on the LED-panel, where the * represents a rotator, | |
975 | showing the activity during the probing phase of the | |
976 | driver which can take up to two minutes per SCSI-adapter. | |
977 | adisplay This works like display, but gives more optical overview | |
978 | of the activities on the SCSI-bus. The display will have | |
979 | the following output: | |
980 | ||
981 | 6543210A | |
982 | ||
983 | where the numbers 0 to 6 light up at the shown position, | |
984 | when the SCSI-device is accessed. 'A' shows again the SCSI | |
985 | hostindex. If display nor adisplay is set, the internal | |
986 | PS/2 harddisk LED is used for media-activities. So, if | |
987 | you really do not have a system with a LED-display, you | |
988 | should not set display or adisplay. Keep in mind, that | |
989 | display and adisplay can only be used alternatively. It | |
990 | is not recommended to use this option, if you have some | |
991 | wide-addressed devices e.g. at the SCSI-2 F/W adapter in | |
992 | your system. In addition, the usage of the display for | |
993 | other tasks in parallel, like the linuxinfo-utility makes | |
994 | no sense with this option. | |
995 | activity This enables the PS/2 harddisk LED activity indicator. | |
996 | Most PS/2 have no alphanumeric LED display, but some | |
997 | indicator. So you should use this parameter to activate it. | |
998 | If you own model 9595 (Server95), you can have both, the | |
999 | LED panel and the activity indicator in parallel. However, | |
1000 | some PS/2s, like the 8595 do not have any harddisk LED | |
1001 | activity indicator, which means, that you must use the | |
1002 | alphanumeric LED display if you want to monitor SCSI- | |
1003 | activity. | |
1004 | bypass This is obsolete from driver version 4.0, as the adapters | |
1005 | got that far understood, that the selection between | |
1006 | integrated and bypassed commands should now work completely | |
1007 | correct! For historical reasons, the old description is | |
1008 | kept here: | |
1009 | This commandline parameter forces the driver never to use | |
1010 | SCSI-subsystems' integrated SCSI-command set. Except of | |
1011 | the immediate assign, which is of vital importance for | |
1012 | every IBM SCSI-subsystem to set its ldns right. Instead, | |
1013 | the ordinary ANSI-SCSI-commands are used and passed by the | |
1014 | controller to the SCSI-devices, therefore 'bypass'. The | |
1015 | effort, done by the subsystem is quite bogus and at a | |
1016 | minimum and therefore it should work everywhere. This | |
1017 | could maybe solve troubles with old or integrated SCSI- | |
1018 | controllers and nasty harddisks. Keep in mind, that using | |
1019 | this flag will slow-down SCSI-accesses slightly, as the | |
1020 | software generated commands are always slower than the | |
1021 | hardware. Non-harddisk devices always get read/write- | |
1022 | commands in bypass mode. On the most recent releases of | |
1023 | the Linux IBM-SCSI-driver, the bypass command should be | |
1024 | no longer a necessary thing, if you are sure about your | |
1025 | SCSI-hardware! | |
1026 | normal This is the parameter, introduced on the 2.0.x development | |
1027 | rail by ZP Gu. This parameter defines the SCSI-device | |
1028 | scan order in the new industry standard. This means, that | |
1029 | the first SCSI-device is the one with the lowest pun. | |
1030 | E.g. harddisk at pun=0 is scanned before harddisk at | |
1031 | pun=6, which means, that harddisk at pun=0 gets sda | |
1032 | and the one at pun=6 gets sdb. | |
1033 | ansi The ANSI-standard for the right scan order, as done by | |
1034 | IBM, Microware and Microsoft, scans SCSI-devices starting | |
1035 | at the highest pun, which means, that e.g. harddisk at | |
1036 | pun=6 gets sda and a harddisk at pun=0 gets sdb. If you | |
1037 | like to have the same SCSI-device order, as in DOS, OS-9 | |
1038 | or OS/2, just use this parameter. | |
1039 | fast SCSI-I/O in synchronous mode is done at 5 MHz for IBM- | |
1040 | SCSI-devices. SCSI-2 Fast/Wide Adapter/A external bus | |
1041 | should then run at 10 MHz if Fast-SCSI is enabled, | |
1042 | and at 5 MHz if Fast-SCSI is disabled on the external | |
1043 | bus. This is the default setting when nothing is | |
1044 | specified here. | |
1045 | medium Synchronous rate is at 50% approximately, which means | |
1046 | 2.5 MHz for IBM SCSI-adapters and 5.0 MHz for F/W ext. | |
1047 | SCSI-bus (when Fast-SCSI speed enabled on external bus). | |
1048 | slow The slowest possible synchronous transfer rate is set. | |
1049 | This means 1.82 MHz for IBM SCSI-adapters and 2.0 MHz | |
1050 | for F/W external bus at Fast-SCSI speed on the external | |
1051 | bus. | |
1052 | ||
1053 | A further option is that you can force the SCSI-driver to accept a SCSI- | |
1054 | subsystem at a certain I/O-address with a predefined adapter PUN. This | |
1055 | is done by entering | |
1056 | ||
1057 | commandN = I/O-base | |
1058 | commandN+1 = adapter PUN | |
1059 | ||
1060 | e.g. ibmmcascsi=0x3540,7 will force the driver to detect a SCSI-subsystem | |
1061 | at I/O-address 0x3540 with adapter PUN 7. Please only use this method, if | |
1062 | the driver does really not recognize your SCSI-adapter! With driver version | |
1063 | 3.2, this recognition of various adapters was hugely improved and you | |
1064 | should try first to remove your commandline arguments of such type with a | |
1065 | newer driver. I bet, it will be recognized correctly. Even multiple and | |
1066 | different types of IBM SCSI-adapters should be recognized correctly, too. | |
1067 | Use the forced detection method only as last solution! | |
1068 | ||
1069 | Examples: | |
1070 | ||
1071 | ibmmcascsi=adisplay | |
1072 | ||
1073 | This will use the advanced display mode for the model 95 LED alphanumeric | |
1074 | display. | |
1075 | ||
1076 | ibmmcascsi=display,0x3558,7 | |
1077 | ||
1078 | This will activate the default display mode for the model 95 LED display | |
1079 | and will force the driver to accept a SCSI-subsystem at I/O-base 0x3558 | |
1080 | with adapter PUN 7. | |
1081 | ||
1082 | 5.2 Troubleshooting | |
1083 | ------------------- | |
1084 | The following FAQs should help you to solve some major problems with this | |
1085 | driver. | |
1086 | ||
1087 | Q: "Reset SCSI-devices at boottime" halts the system at boottime, why? | |
1088 | A: This is only tested with the IBM SCSI Adapter w/cache. It is not | |
992caacf | 1089 | yet proven to run on other adapters, however you may be lucky. |
1da177e4 LT |
1090 | In version 3.1d this has been hugely improved and should work better, |
1091 | now. Normally you really won't need to activate this flag in the | |
1092 | kernel configuration, as all post 1989 SCSI-devices should accept | |
1093 | the reset-signal, when the computer is switched on. The SCSI- | |
1094 | subsystem generates this reset while being initialized. This flag | |
1095 | is really reserved for users with very old, very strange or self-made | |
1096 | SCSI-devices. | |
1097 | Q: Why is the SCSI-order of my drives mirrored to the device-order | |
1098 | seen from OS/2 or DOS ? | |
1099 | A: It depends on the operating system, if it looks at the devices in | |
1100 | ANSI-SCSI-standard (starting from pun 6 and going down to pun 0) or | |
1101 | if it just starts at pun 0 and counts up. If you want to be conform | |
1102 | with OS/2 and DOS, you have to activate this flag in the kernel | |
1103 | configuration or you should set 'ansi' as parameter for the kernel. | |
1104 | The parameter 'normal' sets the new industry standard, starting | |
1105 | from pun 0, scanning up to pun 6. This allows you to change your | |
1106 | opinion still after having already compiled the kernel. | |
2fe0ae78 | 1107 | Q: Why can't I find IBM MCA SCSI support in the config menu? |
1da177e4 LT |
1108 | A: You have to activate MCA bus support, first. |
1109 | Q: Where can I find the latest info about this driver? | |
1110 | A: See the file MAINTAINERS for the current WWW-address, which offers | |
98766fbe | 1111 | updates, info and Q/A lists. At this file's origin, the webaddress |
0ea6e611 | 1112 | was: http://www.staff.uni-mainz.de/mlang/linux.html |
1da177e4 LT |
1113 | Q: My SCSI-adapter is not recognized by the driver, what can I do? |
1114 | A: Just force it to be recognized by kernel parameters. See section 5.1. | |
1115 | If this really happens, do also send e-mail to the maintainer, as | |
1116 | forced detection should be never necessary. Forced detection is in | |
1117 | principal some flaw of the driver adapter detection and goes into | |
01dd2fbf | 1118 | bug reports. |
1da177e4 LT |
1119 | Q: The driver screws up, if it starts to probe SCSI-devices, is there |
1120 | some way out of it? | |
1121 | A: Yes, that was some recognition problem of the correct SCSI-adapter | |
1122 | and its I/O base addresses. Upgrade your driver to the latest release | |
1123 | and it should be fine again. | |
1124 | Q: I get a message: panic IBM MCA SCSI: command error .... , what can | |
1125 | I do against this? | |
1126 | A: Previously, I followed the way by ignoring command errors by using | |
1127 | ibmmcascsi=forgiveall, but this command no longer exists and is | |
1128 | obsolete. If such a problem appears, it is caused by some segmentation | |
1129 | fault of the driver, which maps to some unallowed area. The latest | |
1130 | version of the driver should be ok, as most bugs have been solved. | |
1131 | Q: There are still kernel panics, even after having set | |
1132 | ibmmcascsi=forgiveall. Are there other possibilities to prevent | |
1133 | such panics? | |
1134 | A: No, get just the latest release of the driver and it should work | |
1135 | better and better with increasing version number. Forget about this | |
1136 | ibmmcascsi=forgiveall, as also ignorecmd are obsolete.! | |
1137 | Q: Linux panics or stops without any comment, but it is probable, that my | |
1138 | harddisk(s) have bad blocks. | |
1139 | A: Sorry, the bad-block handling is still a feeble point of this driver, | |
1140 | but is on the schedule for development in the near future. | |
1141 | Q: Linux panics while dynamically assigning SCSI-ids or ldns. | |
1142 | A: If you disconnect a SCSI-device from the machine, while Linux is up | |
1143 | and the driver uses dynamical reassignment of logical device numbers | |
1144 | (ldn), it really gets "angry" if it won't find devices, that were still | |
1145 | present at boottime and stops Linux. | |
1146 | Q: The system does not recover after an abort-command has been generated. | |
1147 | A: This is regrettably true, as it is not yet understood, why the | |
1148 | SCSI-adapter does really NOT generate any interrupt at the end of | |
1149 | the abort-command. As no interrupt is generated, the abort command | |
1150 | cannot get finished and the system hangs, sorry, but checks are | |
1151 | running to hunt down this problem. If there is a real pending command, | |
1152 | the interrupt MUST get generated after abort. In this case, it | |
1153 | should finish well. | |
1154 | Q: The system gets in bad shape after a SCSI-reset, is this known? | |
1155 | A: Yes, as there are a lot of prescriptions (see the Linux Hackers' | |
1156 | Guide) what has to be done for reset, we still share the bad shape of | |
1157 | the reset functions with all other low level SCSI-drivers. | |
1158 | Astonishingly, reset works in most cases quite ok, but the harddisks | |
53cb4726 | 1159 | won't run in synchronous mode anymore after a reset, until you reboot. |
1da177e4 LT |
1160 | Q: Why does my XXX w/Cache adapter not use read-prefetch? |
1161 | A: Ok, that is not completely possible. If a cache is present, the | |
1162 | adapter tries to use it internally. Explicitly, one can use the cache | |
1163 | with a read prefetch command, maybe in future, but this requires | |
1164 | some major overhead of SCSI-commands that risks the performance to | |
1165 | go down more than it gets improved. Tests with that are running. | |
1166 | Q: I have a IBM SCSI-2 Fast/Wide adapter, it boots in some way and hangs. | |
1167 | A: Yes, that is understood, as for sure, your SCSI-2 Fast/Wide adapter | |
1168 | was in such a case recognized as integrated SCSI-adapter or something | |
1169 | else, but not as the correct adapter. As the I/O-ports get assigned | |
1170 | wrongly by that reason, the system should crash in most cases. You | |
1171 | should upgrade to the latest release of the SCSI-driver. The | |
1172 | recommended version is 3.2 or later. Here, the F/W support is in | |
1173 | a stable and reliable condition. Wide-addressing is in addition | |
1174 | supported. | |
01dd2fbf | 1175 | Q: I get an Oops message and something like "killing interrupt". |
1da177e4 LT |
1176 | A: The reason for this is that the IBM SCSI-subsystem only sends a |
1177 | termination status back, if some error appeared. In former releases | |
1178 | of the driver, it was not checked, if the termination status block | |
1179 | is NULL. From version 3.2, it is taken care of this. | |
1180 | Q: I have a F/W adapter and the driver sees my internal SCSI-devices, | |
1181 | but ignores the external ones. | |
1182 | A: Select combined busmode in the IBM config-program and check for that | |
1183 | no SCSI-id on the external devices appears on internal devices. | |
1184 | Reboot afterwards. Dual busmode is supported, but works only for the | |
1185 | internal bus, yet. External bus is still ignored. Take care for your | |
1186 | SCSI-ids. If combined bus-mode is activated, on some adapters, | |
1187 | the wide-addressing is not possible, so devices with ids between 8 | |
1188 | and 15 get ignored by the driver & adapter! | |
1189 | Q: I have a 9595 and I get a NMI during heavy SCSI I/O e.g. during fsck. | |
1190 | A COMMAND ERROR is reported and characters on the screen are missing. | |
1019f96d | 1191 | Warm reboot is not possible. Things look like quite weird. |
1da177e4 LT |
1192 | A: Check the processor type of your 9595. If you have an 80486 or 486DX-2 |
1193 | processor complex on your mainboard and you compiled a kernel that | |
1194 | supports 80386 processors, it is possible, that the kernel cannot | |
1195 | keep track of the PS/2 interrupt handling and stops on an NMI. Just | |
1196 | compile a kernel for the correct processor type of your PS/2 and | |
1197 | everything should be fine. This is necessary even if one assumes, | |
1198 | that some 80486 system should be downward compatible to 80386 | |
1199 | software. | |
1200 | Q: Some commands hang and interrupts block the machine. After some | |
1201 | timeout, the syslog reports that it tries to call abort, but the | |
1202 | machine is frozen. | |
1203 | A: This can be a busy wait bug in the interrupt handler of driver | |
1204 | version 3.2. You should at least upgrade to 3.2c if you use | |
1205 | kernel < 2.4.0 and driver version 4.0 if you use kernel 2.4.0 or | |
1206 | later (including all test releases). | |
1207 | Q: I have a PS/2 model 80 and more than 16 MBytes of RAM. The driver | |
1208 | completely refuses to work, reports NMIs, COMMAND ERRORs or other | |
1209 | ambiguous stuff. When reducing the RAM size down below 16 MB, | |
1210 | everything is running smoothly. | |
1211 | A: No real answer, yet. In any case, one should force the kernel to | |
1212 | present SCBs only below the 16 MBytes barrier. Maybe this solves the | |
1213 | problem. Not yet tried, but guessing that it could work. To get this, | |
1214 | set unchecked_isa_dma argument of ibmmca.h from 0 to 1. | |
1215 | ||
01dd2fbf | 1216 | 5.3 Bug reports |
1da177e4 | 1217 | -------------- |
01dd2fbf | 1218 | If you really find bugs in the source code or the driver will successfully |
1da177e4 LT |
1219 | refuse to work on your machine, you should send a bug report to me. The |
1220 | best for this is to follow the instructions on the WWW-page for this | |
1221 | driver. Fill out the bug-report form, placed on the WWW-page and ship it, | |
1222 | so the bugs can be taken into account with maximum efforts. But, please | |
1223 | do not send bug reports about this driver to Linus Torvalds or Leonard | |
01dd2fbf | 1224 | Zubkoff, as Linus is buried in E-Mail and Leonard is supervising all |
1da177e4 LT |
1225 | SCSI-drivers and won't have the time left to look inside every single |
1226 | driver to fix a bug and especially DO NOT send modified code to Linus | |
1227 | Torvalds or Alan J. Cox which has not been checked here!!! They are both | |
01dd2fbf | 1228 | quite buried in E-mail (as me, sometimes, too) and one should first check |
1da177e4 | 1229 | for problems on my local teststand. Recently, I got a lot of |
01dd2fbf | 1230 | bug reports for errors in the ibmmca.c code, which I could not imagine, but |
1da177e4 LT |
1231 | a look inside some Linux-distribution showed me quite often some modified |
1232 | code, which did no longer work on most other machines than the one of the | |
1233 | modifier. Ok, so now that there is maintenance service available for this | |
1234 | driver, please use this address first in order to keep the level of | |
1235 | confusion low. Thank you! | |
1236 | ||
1237 | When you get a SCSI-error message that panics your system, a list of | |
1238 | register-entries of the SCSI-subsystem is shown (from Version 3.1d). With | |
1239 | this list, it is very easy for the maintainer to localize the problem in | |
1240 | the driver or in the configuration of the user. Please write down all the | |
1241 | values from this report and send them to the maintainer. This would really | |
1242 | help a lot and makes life easier concerning misunderstandings. | |
1243 | ||
1244 | Use the bug-report form (see 5.4 for its address) to send all the bug- | |
1245 | stuff to the maintainer or write e-mail with the values from the table. | |
1246 | ||
1247 | 5.4 Support WWW-page | |
1248 | -------------------- | |
1249 | The address of the IBM SCSI-subsystem supporting WWW-page is: | |
1250 | ||
98766fbe | 1251 | http://www.staff.uni-mainz.de/mlang/linux.html |
1da177e4 LT |
1252 | |
1253 | Here you can find info about the background of this driver, patches, | |
1254 | troubleshooting support, news and a bugreport form. Please check that | |
1255 | WWW-page regularly for latest hints. If ever this URL changes, please | |
1256 | refer to the MAINTAINERS file in order to get the latest address. | |
1257 | ||
1258 | For the bugreport, please fill out the formular on the corresponding | |
1259 | WWW-page. Read the dedicated instructions and write as much as you | |
1260 | know about your problem. If you do not like such formulars, please send | |
1261 | some e-mail directly, but at least with the same information as required by | |
1262 | the formular. | |
1263 | ||
01dd2fbf | 1264 | If you have extensive bug reports, including Oops messages and |
1da177e4 LT |
1265 | screen-shots, please feel free to send it directly to the address |
1266 | of the maintainer, too. The current address of the maintainer is: | |
1267 | ||
1268 | Michael Lang <langa2@kph.uni-mainz.de> | |
1269 | ||
1270 | 6 References | |
1271 | ------------ | |
1272 | IBM Corp., "Update for the PS/2 Hardware Interface Technical Reference, | |
1273 | Common Interfaces", Armonk, September 1991, PN 04G3281, | |
1274 | (available in the U.S. for $21.75 at 1-800-IBM-PCTB or in Germany for | |
1275 | around 40,-DM at "Hallo IBM"). | |
1276 | ||
1277 | IBM Corp., "Personal System/2 Micro Channel SCSI | |
1278 | Adapter with Cache Technical Reference", Armonk, March 1990, PN 68X2365. | |
1279 | ||
1280 | IBM Corp., "Personal System/2 Micro Channel SCSI | |
1281 | Adapter Technical Reference", Armonk, March 1990, PN 68X2397. | |
1282 | ||
1283 | IBM Corp., "SCSI-2 Fast/Wide Adapter/A Technical Reference - Dual Bus", | |
1284 | Armonk, March 1994, PN 83G7545. | |
1285 | ||
1286 | Friedhelm Schmidt, "SCSI-Bus und IDE-Schnittstelle - Moderne Peripherie- | |
1287 | Schnittstellen: Hardware, Protokollbeschreibung und Anwendung", 2. Aufl. | |
1288 | Addison Wesley, 1996. | |
1289 | ||
1290 | Michael K. Johnson, "The Linux Kernel Hackers' Guide", Version 0.6, Chapel | |
1291 | Hill - North Carolina, 1995 | |
1292 | ||
1293 | Andreas Kaiser, "SCSI TAPE BACKUP for OS/2 2.0", Version 2.12, Stuttgart | |
1294 | 1993 | |
1295 | ||
1296 | Helmut Rompel, "IBM Computerwelt GUIDE", What is what bei IBM., Systeme * | |
1297 | Programme * Begriffe, IWT-Verlag GmbH - Muenchen, 1988 | |
1298 | ||
1299 | 7 Credits to | |
1300 | ------------ | |
1301 | 7.1 People | |
1302 | ---------- | |
1303 | Klaus Grimm | |
1304 | who already a long time ago gave me the old code from the | |
1305 | SCSI-driver in order to get it running for some old machine | |
1306 | in our institute. | |
1307 | Martin Kolinek | |
1308 | who wrote the first release of the IBM SCSI-subsystem driver. | |
1309 | Chris Beauregard | |
1310 | who for a long time maintained MCA-Linux and the SCSI-driver | |
1311 | in the beginning. Chris, wherever you are: Cheers to you! | |
1312 | Klaus Kudielka | |
1313 | with whom in the 2.1.x times, I had a quite fruitful | |
1314 | cooperation to get the driver running as a module and to get | |
1315 | it running with multiple SCSI-adapters. | |
1316 | David Weinehall | |
1317 | for his excellent maintenance of the MCA-stuff and the quite | |
1318 | detailed bug reports and ideas for this driver (and his | |
1319 | patience ;-)). | |
1320 | Alan J. Cox | |
01dd2fbf | 1321 | for his bug reports and his bold activities in cross-checking |
1da177e4 LT |
1322 | the driver-code with his teststand. |
1323 | ||
1324 | 7.2 Sponsors & Supporters | |
1325 | ------------------------- | |
1326 | "Hallo IBM", | |
1327 | IBM-Deutschland GmbH | |
1328 | the service of IBM-Deutschland for customers. Their E-Mail | |
1329 | service is unbeatable. Whatever old stuff I asked for, I | |
1330 | always got some helpful answers. | |
1331 | Karl-Otto Reimers, | |
1332 | IBM Klub - Sparte IBM Geschichte, Sindelfingen | |
1333 | for sending me a copy of the w/Cache manual from the | |
1334 | IBM-Deutschland archives. | |
1335 | Harald Staiger | |
1336 | for his extensive hardware donations which allows me today | |
1337 | still to test the driver in various constellations. | |
1338 | Erich Fritscher | |
1339 | for his very kind sponsoring. | |
1340 | Louis Ohland, | |
1341 | Charles Lasitter | |
1342 | for support by shipping me an IBM SCSI-2 Fast/Wide manual. | |
1343 | In addition, the contribution of various hardware is quite | |
1344 | decessive and will make it possible to add FWSR (RAID) | |
1345 | adapter support to the driver in the near future! So, | |
1346 | complaints about no RAID support won't remain forever. | |
1347 | Yes, folks, that is no joke, RAID support is going to rise! | |
1348 | Erik Weber | |
1349 | for the great deal we made about a model 9595 and the nice | |
1350 | surrounding equipment and the cool trip to Mannheim | |
1351 | second-hand computer market. In addition, I would like | |
1352 | to thank him for his exhaustive SCSI-driver testing on his | |
1353 | 95er PS/2 park. | |
1354 | Anthony Hogbin | |
1355 | for his direct shipment of a SCSI F/W adapter, which allowed | |
1356 | me immediately on the first stage to try it on model 8557 | |
1357 | together with onboard SCSI adapter and some SCSI w/Cache. | |
1358 | Andreas Hotz | |
1359 | for his support by memory and an IBM SCSI-adapter. Collecting | |
1360 | all this together now allows me to try really things with | |
1361 | the driver at maximum load and variety on various models in | |
1362 | a very quick and efficient way. | |
1363 | Peter Jennewein | |
1364 | for his model 30, which serves me as part of my teststand | |
1365 | and his cool remark about how you make an ordinary diskette | |
1366 | drive working and how to connect it to an IBM-diskette port. | |
1367 | Johannes Gutenberg-Universitaet, Mainz & | |
1368 | Institut fuer Kernphysik, Mainz Microtron (MAMI) | |
1369 | for the offered space, the link, placed on the central | |
1370 | homepage and the space to store and offer the driver and | |
1371 | related material and the free working times, which allow | |
1372 | me to answer all your e-mail. | |
1373 | ||
1374 | 8 Trademarks | |
1375 | ------------ | |
1376 | IBM, PS/2, OS/2, Microchannel are registered trademarks of International | |
1377 | Business Machines Corporation | |
1378 | ||
1379 | MS-DOS is a registered trademark of Microsoft Corporation | |
1380 | ||
1381 | Microware, OS-9 are registered trademarks of Microware Systems | |
1382 | ||
1383 | 9 Disclaimer | |
1384 | ------------ | |
1385 | Beside the GNU General Public License and the dependent disclaimers and disclaimers | |
1386 | concerning the Linux-kernel in special, this SCSI-driver comes without any | |
1387 | warranty. Its functionality is tested as good as possible on certain | |
1388 | machines and combinations of computer hardware, which does not exclude, | |
d9195881 | 1389 | that data loss or severe damage of hardware is possible while using this |
1da177e4 LT |
1390 | part of software on some arbitrary computer hardware or in combination |
1391 | with other software packages. It is highly recommended to make backup | |
1392 | copies of your data before using this software. Furthermore, personal | |
1393 | injuries by hardware defects, that could be caused by this SCSI-driver are | |
1394 | not excluded and it is highly recommended to handle this driver with a | |
1395 | maximum of carefulness. | |
1396 | ||
1397 | This driver supports hardware, produced by International Business Machines | |
1398 | Corporation (IBM). | |
1399 | ||
1400 | ------ | |
1401 | Michael Lang | |
1402 | (langa2@kph.uni-mainz.de) |