drivers/tty/serial/8250/Kconfig

   1 #
   2 # The 8250/16550 serial drivers.  You shouldn't be in this list unless
   3 # you somehow have an implicit or explicit dependency on SERIAL_8250.
   4 #
   5
   6 config SERIAL_8250
   7         tristate "8250/16550 and compatible serial support"
   8         select SERIAL_CORE
   9         ---help---
  10           This selects whether you want to include the driver for the standard
  11           serial ports.  The standard answer is Y.  People who might say N
  12           here are those that are setting up dedicated Ethernet WWW/FTP
  13           servers, or users that have one of the various bus mice instead of a
  14           serial mouse and don't intend to use their machine's standard serial
  15           port for anything.  (Note that the Cyclades multi serial port driver
  16           does not need this driver built in for it to work.)
  17
  18           To compile this driver as a module, choose M here: the
  19           module will be called 8250.
  20           [WARNING: Do not compile this driver as a module if you are using
  21           non-standard serial ports, since the configuration information will
  22           be lost when the driver is unloaded.  This limitation may be lifted
  23           in the future.]
  24
  25           BTW1: If you have a mouseman serial mouse which is not recognized by
  26           the X window system, try running gpm first.
  27
  28           BTW2: If you intend to use a software modem (also called Winmodem)
  29           under Linux, forget it.  These modems are crippled and require
  30           proprietary drivers which are only available under Windows.
  31
  32           Most people will say Y or M here, so that they can use serial mice,
  33           modems and similar devices connecting to the standard serial ports.
  34
  35 config SERIAL_8250_DEPRECATED_OPTIONS
  36         bool "Support 8250_core.* kernel options (DEPRECATED)"
  37         depends on SERIAL_8250
  38         default y
  39         ---help---
  40           In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
  41           accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
  42           8250.nr_uarts=4. We now renamed the module back to 8250, but if
  43           anybody noticed in 3.7 and changed their userspace we still have to
  44           keep the 8250_core.* options around until they revert the changes
  45           they already did.
  46
  47           If 8250 is built as a module, this adds 8250_core alias instead.
  48
  49           If you did not notice yet and/or you have userspace from pre-3.7, it
  50           is safe (and recommended) to say N here.
  51
  52 config SERIAL_8250_PNP
  53         bool "8250/16550 PNP device support" if EXPERT
  54         depends on SERIAL_8250 && PNP
  55         default y
  56         ---help---
  57           This builds standard PNP serial support. You may be able to
  58           disable this feature if you only need legacy serial support.
  59
  60 config SERIAL_8250_CONSOLE
  61         bool "Console on 8250/16550 and compatible serial port"
  62         depends on SERIAL_8250=y
  63         select SERIAL_CORE_CONSOLE
  64         select SERIAL_EARLYCON
  65         ---help---
  66           If you say Y here, it will be possible to use a serial port as the
  67           system console (the system console is the device which receives all
  68           kernel messages and warnings and which allows logins in single user
  69           mode). This could be useful if some terminal or printer is connected
  70           to that serial port.
  71
  72           Even if you say Y here, the currently visible virtual console
  73           (/dev/tty0) will still be used as the system console by default, but
  74           you can alter that using a kernel command line option such as
  75           "console=ttyS1". (Try "man bootparam" or see the documentation of
  76           your boot loader (grub or lilo or loadlin) about how to pass options
  77           to the kernel at boot time.)
  78
  79           If you don't have a VGA card installed and you say Y here, the
  80           kernel will automatically use the first serial line, /dev/ttyS0, as
  81           system console.
  82
  83           You can set that using a kernel command line option such as
  84           "console=uart8250,io,0x3f8,9600n8"
  85           "console=uart8250,mmio,0xff5e0000,115200n8".
  86           and it will switch to normal serial console when the corresponding
  87           port is ready.
  88           "earlycon=uart8250,io,0x3f8,9600n8"
  89           "earlycon=uart8250,mmio,0xff5e0000,115200n8".
  90           it will not only setup early console.
  91
  92           If unsure, say N.
  93
  94 config SERIAL_8250_GSC
  95         tristate
  96         depends on SERIAL_8250 && GSC
  97         default SERIAL_8250
  98
  99 config SERIAL_8250_DMA
 100         bool "DMA support for 16550 compatible UART controllers" if EXPERT
 101         depends on SERIAL_8250 && DMADEVICES=y
 102         default SERIAL_8250
 103         help
 104           This builds DMA support that can be used with 8250/16650
 105           compatible UART controllers that support DMA signaling.
 106
 107 config SERIAL_8250_PCI
 108         tristate "8250/16550 PCI device support" if EXPERT
 109         depends on SERIAL_8250 && PCI
 110         default SERIAL_8250
 111         select RATIONAL
 112         help
 113           This builds standard PCI serial support. You may be able to
 114           disable this feature if you only need legacy serial support.
 115           Saves about 9K.
 116           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
 117           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
 118
 119 config SERIAL_8250_HP300
 120         tristate
 121         depends on SERIAL_8250 && HP300
 122         default SERIAL_8250
 123
 124 config SERIAL_8250_CS
 125         tristate "8250/16550 PCMCIA device support"
 126         depends on PCMCIA && SERIAL_8250
 127         ---help---
 128           Say Y here to enable support for 16-bit PCMCIA serial devices,
 129           including serial port cards, modems, and the modem functions of
 130           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
 131           credit-card size devices often used with laptops.)
 132
 133           To compile this driver as a module, choose M here: the
 134           module will be called serial_cs.
 135
 136           If unsure, say N.
 137
 138 config SERIAL_8250_NR_UARTS
 139         int "Maximum number of 8250/16550 serial ports"
 140         depends on SERIAL_8250
 141         default "4"
 142         help
 143           Set this to the number of serial ports you want the driver
 144           to support.  This includes any ports discovered via ACPI or
 145           PCI enumeration and any ports that may be added at run-time
 146           via hot-plug, or any ISA multi-port serial cards.
 147
 148 config SERIAL_8250_RUNTIME_UARTS
 149         int "Number of 8250/16550 serial ports to register at runtime"
 150         depends on SERIAL_8250
 151         range 0 SERIAL_8250_NR_UARTS
 152         default "4"
 153         help
 154           Set this to the maximum number of serial ports you want
 155           the kernel to register at boot time.  This can be overridden
 156           with the module parameter "nr_uarts", or boot-time parameter
 157           8250.nr_uarts
 158
 159 config SERIAL_8250_EXTENDED
 160         bool "Extended 8250/16550 serial driver options"
 161         depends on SERIAL_8250
 162         help
 163           If you wish to use any non-standard features of the standard "dumb"
 164           driver, say Y here. This includes HUB6 support, shared serial
 165           interrupts, special multiport support, support for more than the
 166           four COM 1/2/3/4 boards, etc.
 167
 168           Note that the answer to this question won't directly affect the
 169           kernel: saying N will just cause the configurator to skip all
 170           the questions about serial driver options. If unsure, say N.
 171
 172 config SERIAL_8250_MANY_PORTS
 173         bool "Support more than 4 legacy serial ports"
 174         depends on SERIAL_8250_EXTENDED && !IA64
 175         help
 176           Say Y here if you have dumb serial boards other than the four
 177           standard COM 1/2/3/4 ports. This may happen if you have an AST
 178           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
 179           from <http://www.tldp.org/docs.html#howto>), or other custom
 180           serial port hardware which acts similar to standard serial port
 181           hardware. If you only use the standard COM 1/2/3/4 ports, you can
 182           say N here to save some memory. You can also say Y if you have an
 183           "intelligent" multiport card such as Cyclades, Digiboards, etc.
 184
 185 #
 186 # Multi-port serial cards
 187 #
 188
 189 config SERIAL_8250_FOURPORT
 190         tristate "Support Fourport cards"
 191         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 192         help
 193           Say Y here if you have an AST FourPort serial board.
 194
 195           To compile this driver as a module, choose M here: the module
 196           will be called 8250_fourport.
 197
 198 config SERIAL_8250_ACCENT
 199         tristate "Support Accent cards"
 200         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 201         help
 202           Say Y here if you have an Accent Async serial board.
 203
 204           To compile this driver as a module, choose M here: the module
 205           will be called 8250_accent.
 206
 207 config SERIAL_8250_BOCA
 208         tristate "Support Boca cards"
 209         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 210         help
 211           Say Y here if you have a Boca serial board.  Please read the Boca
 212           mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
 213
 214           To compile this driver as a module, choose M here: the module
 215           will be called 8250_boca.
 216
 217 config SERIAL_8250_EXAR_ST16C554
 218         tristate "Support Exar ST16C554/554D Quad UART"
 219         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 220         help
 221           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
 222           tinkering with your Envoy TU301, or have a machine with this UART,
 223           say Y here.
 224
 225           To compile this driver as a module, choose M here: the module
 226           will be called 8250_exar_st16c554.
 227
 228 config SERIAL_8250_HUB6
 229         tristate "Support Hub6 cards"
 230         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 231         help
 232           Say Y here if you have a HUB6 serial board.
 233
 234           To compile this driver as a module, choose M here: the module
 235           will be called 8250_hub6.
 236
 237 #
 238 # Misc. options/drivers.
 239 #
 240
 241 config SERIAL_8250_SHARE_IRQ
 242         bool "Support for sharing serial interrupts"
 243         depends on SERIAL_8250_EXTENDED
 244         help
 245           Some serial boards have hardware support which allows multiple dumb
 246           serial ports on the same board to share a single IRQ. To enable
 247           support for this in the serial driver, say Y here.
 248
 249 config SERIAL_8250_DETECT_IRQ
 250         bool "Autodetect IRQ on standard ports (unsafe)"
 251         depends on SERIAL_8250_EXTENDED
 252         help
 253           Say Y here if you want the kernel to try to guess which IRQ
 254           to use for your serial port.
 255
 256           This is considered unsafe; it is far better to configure the IRQ in
 257           a boot script using the setserial command.
 258
 259           If unsure, say N.
 260
 261 config SERIAL_8250_RSA
 262         bool "Support RSA serial ports"
 263         depends on SERIAL_8250_EXTENDED
 264         help
 265           Say Y here if you have a IODATA RSA-DV II/S ISA card and
 266           would like to use its >115kbps speeds.
 267           You will need to provide module parameter "probe_rsa", or boot-time
 268           parameter 8250.probe_rsa with I/O addresses of this card then.
 269
 270           If you don't have such card, or if unsure, say N.
 271
 272 config SERIAL_8250_ACORN
 273         tristate "Acorn expansion card serial port support"
 274         depends on ARCH_ACORN && SERIAL_8250
 275         help
 276           If you have an Atomwide Serial card or Serial Port card for an Acorn
 277           system, say Y to this option.  The driver can handle 1, 2, or 3 port
 278           cards.  If unsure, say N.
 279
 280 config SERIAL_8250_BCM2835AUX
 281         tristate "BCM2835 auxiliar mini UART support"
 282         depends on ARCH_BCM2835 || COMPILE_TEST
 283         depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
 284         help
 285           Support for the BCM2835 auxiliar mini UART.
 286
 287           Features and limitations of the UART are
 288             Registers are similar to 16650 registers,
 289               set bits in the control registers that are unsupported
 290               are ignored and read back as 0
 291             7/8 bit operation with 1 start and 1 stop bit
 292             8 symbols deep fifo for rx and tx
 293             SW controlled RTS and SW readable CTS
 294             Clock rate derived from system clock
 295             Uses 8 times oversampling (compared to 16 times for 16650)
 296             Missing break detection (but break generation)
 297             Missing framing error detection
 298             Missing parity bit
 299             Missing receive time-out interrupt
 300             Missing DCD, DSR, DTR and RI signals
 301
 302           If unsure, say N.
 303
 304 config SERIAL_8250_FSL
 305         bool
 306         depends on SERIAL_8250_CONSOLE
 307         default PPC || ARM || ARM64
 308
 309 config SERIAL_8250_DW
 310         tristate "Support for Synopsys DesignWare 8250 quirks"
 311         depends on SERIAL_8250
 312         help
 313           Selecting this option will enable handling of the extra features
 314           present in the Synopsys DesignWare APB UART.
 315
 316 config SERIAL_8250_EM
 317         tristate "Support for Emma Mobile integrated serial port"
 318         depends on SERIAL_8250 && ARM && HAVE_CLK
 319         help
 320           Selecting this option will add support for the integrated serial
 321           port hardware found on the Emma Mobile line of processors.
 322           If unsure, say N.
 323
 324 config SERIAL_8250_RT288X
 325         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
 326         depends on SERIAL_8250
 327         default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
 328         help
 329           Selecting this option will add support for the alternate register
 330           layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
 331           If unsure, say N.
 332
 333 config SERIAL_8250_OMAP
 334         tristate "Support for OMAP internal UART (8250 based driver)"
 335         depends on SERIAL_8250 && ARCH_OMAP2PLUS
 336         help
 337           If you have a machine based on an Texas Instruments OMAP CPU you
 338           can enable its onboard serial ports by enabling this option.
 339
 340           This driver uses ttyS instead of ttyO.
 341
 342 config SERIAL_8250_OMAP_TTYO_FIXUP
 343         bool "Replace ttyO with ttyS"
 344         depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
 345         default y
 346         help
 347           This option replaces the "console=ttyO" argument with the matching
 348           ttyS argument if the user did not specified it on the command line.
 349           This ensures that the user can see the kernel output during boot
 350           which he wouldn't see otherwise. The getty has still to be configured
 351           for ttyS instead of ttyO regardless of this option.
 352           This option is intended for people who "automatically" enable this
 353           driver without knowing that this driver requires a different console=
 354           argument. If you read this, please keep this option disabled and
 355           instead update your kernel command line. If you prepare a kernel for a
 356           distribution or other kind of larger user base then you probably want
 357           to keep this option enabled. Otherwise people might complain about a
 358           not booting kernel because the serial console remains silent in case
 359           they forgot to update the command line.
 360
 361 config SERIAL_8250_FINTEK
 362         tristate "Support for Fintek F81216A LPC to 4 UART"
 363         depends on SERIAL_8250 && PNP
 364         help
 365           Selecting this option will add support for the Fintek F81216A
 366           LPC to 4 UART. This device has some RS485 functionality not available
 367           through the PNP driver. If unsure, say N.
 368
 369 config SERIAL_8250_LPC18XX
 370         tristate "NXP LPC18xx/43xx serial port support"
 371         depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
 372         default ARCH_LPC18XX
 373         help
 374           If you have a LPC18xx/43xx based board and want to use the
 375           serial port, say Y to this option. If unsure, say Y.
 376
 377 config SERIAL_8250_MT6577
 378         tristate "Mediatek serial port support"
 379         depends on SERIAL_8250 && ARCH_MEDIATEK
 380         help
 381           If you have a Mediatek based board and want to use the
 382           serial port, say Y to this option. If unsure, say N.
 383
 384 config SERIAL_8250_UNIPHIER
 385         tristate "Support for UniPhier on-chip UART"
 386         depends on SERIAL_8250 && ARCH_UNIPHIER
 387         help
 388           If you have a UniPhier based board and want to use the on-chip
 389           serial ports, say Y to this option. If unsure, say N.
 390
 391 config SERIAL_8250_INGENIC
 392         tristate "Support for Ingenic SoC serial ports"
 393         depends on SERIAL_8250
 394         depends on (OF_FLATTREE && SERIAL_8250_CONSOLE) || !SERIAL_EARLYCON
 395         depends on MIPS || COMPILE_TEST
 396         help
 397           If you have a system using an Ingenic SoC and wish to make use of
 398           its UARTs, say Y to this option. If unsure, say N.
 399
 400 config SERIAL_8250_MID
 401         tristate "Support for serial ports on Intel MID platforms"
 402         depends on SERIAL_8250 && PCI
 403         select HSU_DMA if SERIAL_8250_DMA
 404         select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
 405         select RATIONAL
 406         help
 407           Selecting this option will enable handling of the extra features
 408           present on the UART found on Intel Medfield SOC and various other
 409           Intel platforms.
 410
 411 config SERIAL_8250_MOXA
 412         tristate "MOXA SmartIO MUE support"
 413         depends on SERIAL_8250 && PCI
 414         help
 415           Say Y here if you have a Moxa SmartIO MUE multiport serial card.
 416           If unsure, say N.
 417
 418           This driver can also be built as a module. The module will be called
 419           8250_moxa. If you want to do that, say M here.
 420
 421 config SERIAL_OF_PLATFORM
 422         tristate "Devicetree based probing for 8250 ports"
 423         depends on SERIAL_8250 && OF
 424         help
 425           This option is used for all 8250 compatible serial ports that
 426           are probed through devicetree, including Open Firmware based
 427           PowerPC systems and embedded systems on architectures using the
 428           flattened device tree format.