| 1 | menu "Kernel hacking" |
| 2 | |
| 3 | source "lib/Kconfig.debug" |
| 4 | |
| 5 | config PRINT_STACK_DEPTH |
| 6 | int "Stack depth to print" if DEBUG_KERNEL |
| 7 | default 64 |
| 8 | help |
| 9 | This option allows you to set the stack depth that the kernel |
| 10 | prints in stack traces. This can be useful if your display is |
| 11 | too small and stack traces cause important information to |
| 12 | scroll off the screen. |
| 13 | |
| 14 | config DEBUG_STACKOVERFLOW |
| 15 | bool "Check for stack overflows" |
| 16 | depends on DEBUG_KERNEL |
| 17 | help |
| 18 | This option will cause messages to be printed if free stack space |
| 19 | drops below a certain limit. |
| 20 | |
| 21 | config DEBUG_STACK_USAGE |
| 22 | bool "Stack utilization instrumentation" |
| 23 | depends on DEBUG_KERNEL |
| 24 | help |
| 25 | Enables the display of the minimum amount of free stack which each |
| 26 | task has ever had available in the sysrq-T and sysrq-P debug output. |
| 27 | |
| 28 | This option will slow down process creation somewhat. |
| 29 | |
| 30 | config HCALL_STATS |
| 31 | bool "Hypervisor call instrumentation" |
| 32 | depends on PPC_PSERIES && DEBUG_FS |
| 33 | help |
| 34 | Adds code to keep track of the number of hypervisor calls made and |
| 35 | the amount of time spent in hypervisor calls. Wall time spent in |
| 36 | each call is always calculated, and if available CPU cycles spent |
| 37 | are also calculated. A directory named hcall_inst is added at the |
| 38 | root of the debugfs filesystem. Within the hcall_inst directory |
| 39 | are files that contain CPU specific call statistics. |
| 40 | |
| 41 | This option will add a small amount of overhead to all hypervisor |
| 42 | calls. |
| 43 | |
| 44 | config CODE_PATCHING_SELFTEST |
| 45 | bool "Run self-tests of the code-patching code." |
| 46 | depends on DEBUG_KERNEL |
| 47 | default n |
| 48 | |
| 49 | config FTR_FIXUP_SELFTEST |
| 50 | bool "Run self-tests of the feature-fixup code." |
| 51 | depends on DEBUG_KERNEL |
| 52 | default n |
| 53 | |
| 54 | config MSI_BITMAP_SELFTEST |
| 55 | bool "Run self-tests of the MSI bitmap code." |
| 56 | depends on DEBUG_KERNEL |
| 57 | default n |
| 58 | |
| 59 | config XMON |
| 60 | bool "Include xmon kernel debugger" |
| 61 | depends on DEBUG_KERNEL |
| 62 | help |
| 63 | Include in-kernel hooks for the xmon kernel monitor/debugger. |
| 64 | Unless you are intending to debug the kernel, say N here. |
| 65 | Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise |
| 66 | nothing will appear on the screen (xmon writes directly to the |
| 67 | framebuffer memory). |
| 68 | The cmdline option 'xmon' or 'xmon=early' will drop into xmon |
| 69 | very early during boot. 'xmon=on' will just enable the xmon |
| 70 | debugger hooks. 'xmon=off' will disable the debugger hooks |
| 71 | if CONFIG_XMON_DEFAULT is set. |
| 72 | xmon will print a backtrace on the very first invocation. |
| 73 | 'xmon=nobt' will disable this autobacktrace. |
| 74 | |
| 75 | config XMON_DEFAULT |
| 76 | bool "Enable xmon by default" |
| 77 | depends on XMON |
| 78 | help |
| 79 | xmon is normally disabled unless booted with 'xmon=on'. |
| 80 | Use 'xmon=off' to disable xmon init during runtime. |
| 81 | |
| 82 | config XMON_DISASSEMBLY |
| 83 | bool "Include disassembly support in xmon" |
| 84 | depends on XMON |
| 85 | default y |
| 86 | help |
| 87 | Include support for disassembling in xmon. You probably want |
| 88 | to say Y here, unless you're building for a memory-constrained |
| 89 | system. |
| 90 | |
| 91 | config DEBUGGER |
| 92 | bool |
| 93 | depends on KGDB || XMON |
| 94 | default y |
| 95 | |
| 96 | config IRQSTACKS |
| 97 | bool "Use separate kernel stacks when processing interrupts" |
| 98 | help |
| 99 | If you say Y here the kernel will use separate kernel stacks |
| 100 | for handling hard and soft interrupts. This can help avoid |
| 101 | overflowing the process kernel stacks. |
| 102 | |
| 103 | config VIRQ_DEBUG |
| 104 | bool "Expose hardware/virtual IRQ mapping via debugfs" |
| 105 | depends on DEBUG_FS |
| 106 | help |
| 107 | This option will show the mapping relationship between hardware irq |
| 108 | numbers and virtual irq numbers. The mapping is exposed via debugfs |
| 109 | in the file powerpc/virq_mapping. |
| 110 | |
| 111 | If you don't know what this means you don't need it. |
| 112 | |
| 113 | config BDI_SWITCH |
| 114 | bool "Include BDI-2000 user context switcher" |
| 115 | depends on DEBUG_KERNEL && PPC32 |
| 116 | help |
| 117 | Include in-kernel support for the Abatron BDI2000 debugger. |
| 118 | Unless you are intending to debug the kernel with one of these |
| 119 | machines, say N here. |
| 120 | |
| 121 | config BOOTX_TEXT |
| 122 | bool "Support for early boot text console (BootX or OpenFirmware only)" |
| 123 | depends on PPC_OF && PPC_BOOK3S |
| 124 | help |
| 125 | Say Y here to see progress messages from the boot firmware in text |
| 126 | mode. Requires either BootX or Open Firmware. |
| 127 | |
| 128 | config PPC_EARLY_DEBUG |
| 129 | bool "Early debugging (dangerous)" |
| 130 | # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water |
| 131 | # mark, which doesn't work with current 440 KVM. |
| 132 | depends on !KVM |
| 133 | help |
| 134 | Say Y to enable some early debugging facilities that may be available |
| 135 | for your processor/board combination. Those facilities are hacks |
| 136 | intended to debug problems early during boot, this should not be |
| 137 | enabled in a production kernel. |
| 138 | Note that enabling this will also cause the kernel default log level |
| 139 | to be pushed to max automatically very early during boot |
| 140 | |
| 141 | choice |
| 142 | prompt "Early debugging console" |
| 143 | depends on PPC_EARLY_DEBUG |
| 144 | help |
| 145 | Use the selected console for early debugging. Careful, if you |
| 146 | enable debugging for the wrong type of machine your kernel |
| 147 | _will not boot_. |
| 148 | |
| 149 | config PPC_EARLY_DEBUG_LPAR |
| 150 | bool "LPAR HV Console" |
| 151 | depends on PPC_PSERIES |
| 152 | help |
| 153 | Select this to enable early debugging for a machine with a HVC |
| 154 | console on vterm 0. |
| 155 | |
| 156 | config PPC_EARLY_DEBUG_G5 |
| 157 | bool "Apple G5" |
| 158 | depends on PPC_PMAC64 |
| 159 | help |
| 160 | Select this to enable early debugging for Apple G5 machines. |
| 161 | |
| 162 | config PPC_EARLY_DEBUG_RTAS_PANEL |
| 163 | bool "RTAS Panel" |
| 164 | depends on PPC_RTAS |
| 165 | help |
| 166 | Select this to enable early debugging via the RTAS panel. |
| 167 | |
| 168 | config PPC_EARLY_DEBUG_RTAS_CONSOLE |
| 169 | bool "RTAS Console" |
| 170 | depends on PPC_RTAS |
| 171 | select UDBG_RTAS_CONSOLE |
| 172 | help |
| 173 | Select this to enable early debugging via the RTAS console. |
| 174 | |
| 175 | config PPC_EARLY_DEBUG_MAPLE |
| 176 | bool "Maple real mode" |
| 177 | depends on PPC_MAPLE |
| 178 | help |
| 179 | Select this to enable early debugging for Maple. |
| 180 | |
| 181 | config PPC_EARLY_DEBUG_ISERIES |
| 182 | bool "iSeries HV Console" |
| 183 | depends on PPC_ISERIES |
| 184 | help |
| 185 | Select this to enable early debugging for legacy iSeries. You need |
| 186 | to hit "Ctrl-x Ctrl-x" to see the messages on the console. |
| 187 | |
| 188 | config PPC_EARLY_DEBUG_PAS_REALMODE |
| 189 | bool "PA Semi real mode" |
| 190 | depends on PPC_PASEMI |
| 191 | help |
| 192 | Select this to enable early debugging for PA Semi. |
| 193 | Output will be on UART0. |
| 194 | |
| 195 | config PPC_EARLY_DEBUG_BEAT |
| 196 | bool "Beat HV Console" |
| 197 | depends on PPC_CELLEB |
| 198 | select PPC_UDBG_BEAT |
| 199 | help |
| 200 | Select this to enable early debugging for Celleb with Beat. |
| 201 | |
| 202 | config PPC_EARLY_DEBUG_44x |
| 203 | bool "Early serial debugging for IBM/AMCC 44x CPUs" |
| 204 | depends on 44x |
| 205 | help |
| 206 | Select this to enable early debugging for IBM 44x chips via the |
| 207 | inbuilt serial port. If you enable this, ensure you set |
| 208 | PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. |
| 209 | |
| 210 | config PPC_EARLY_DEBUG_40x |
| 211 | bool "Early serial debugging for IBM/AMCC 40x CPUs" |
| 212 | depends on 40x |
| 213 | help |
| 214 | Select this to enable early debugging for IBM 40x chips via the |
| 215 | inbuilt serial port. This works on chips with a 16550 compatible |
| 216 | UART. Xilinx chips with uartlite cannot use this option. |
| 217 | |
| 218 | config PPC_EARLY_DEBUG_CPM |
| 219 | bool "Early serial debugging for Freescale CPM-based serial ports" |
| 220 | depends on SERIAL_CPM |
| 221 | select PIN_TLB if PPC_8xx |
| 222 | help |
| 223 | Select this to enable early debugging for Freescale chips |
| 224 | using a CPM-based serial port. This assumes that the bootwrapper |
| 225 | has run, and set up the CPM in a particular way. |
| 226 | |
| 227 | endchoice |
| 228 | |
| 229 | config PPC_EARLY_DEBUG_44x_PHYSLOW |
| 230 | hex "Low 32 bits of early debug UART physical address" |
| 231 | depends on PPC_EARLY_DEBUG_44x |
| 232 | default "0x40000200" |
| 233 | help |
| 234 | You probably want 0x40000200 for ebony boards and |
| 235 | 0x40000300 for taishan |
| 236 | |
| 237 | config PPC_EARLY_DEBUG_44x_PHYSHIGH |
| 238 | hex "EPRN of early debug UART physical address" |
| 239 | depends on PPC_EARLY_DEBUG_44x |
| 240 | default "0x1" |
| 241 | |
| 242 | config PPC_EARLY_DEBUG_40x_PHYSADDR |
| 243 | hex "Early debug UART physical address" |
| 244 | depends on PPC_EARLY_DEBUG_40x |
| 245 | default "0xef600300" |
| 246 | |
| 247 | config PPC_EARLY_DEBUG_CPM_ADDR |
| 248 | hex "CPM UART early debug transmit descriptor address" |
| 249 | depends on PPC_EARLY_DEBUG_CPM |
| 250 | default "0xfa202008" if PPC_EP88XC |
| 251 | default "0xf0001ff8" if CPM2 |
| 252 | default "0xff002008" if CPM1 |
| 253 | help |
| 254 | This specifies the address of the transmit descriptor |
| 255 | used for early debug output. Because it is needed before |
| 256 | platform probing is done, all platforms selected must |
| 257 | share the same address. |
| 258 | |
| 259 | endmenu |