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         select SERIAL_MCTRL_GPIO if GPIOLIB
  10         ---help---
  11           This selects whether you want to include the driver for the standard
  12           serial ports.  The standard answer is Y.  People who might say N
  13           here are those that are setting up dedicated Ethernet WWW/FTP
  14           servers, or users that have one of the various bus mice instead of a
  15           serial mouse and don't intend to use their machine's standard serial
  16           port for anything.  (Note that the Cyclades multi serial port driver
  17           does not need this driver built in for it to work.)
  18
  19           To compile this driver as a module, choose M here: the
  20           module will be called 8250.
  21           [WARNING: Do not compile this driver as a module if you are using
  22           non-standard serial ports, since the configuration information will
  23           be lost when the driver is unloaded.  This limitation may be lifted
  24           in the future.]
  25
  26           BTW1: If you have a mouseman serial mouse which is not recognized by
  27           the X window system, try running gpm first.
  28
  29           BTW2: If you intend to use a software modem (also called Winmodem)
  30           under Linux, forget it.  These modems are crippled and require
  31           proprietary drivers which are only available under Windows.
  32
  33           Most people will say Y or M here, so that they can use serial mice,
  34           modems and similar devices connecting to the standard serial ports.
  35
  36 config SERIAL_8250_DEPRECATED_OPTIONS
  37         bool "Support 8250_core.* kernel options (DEPRECATED)"
  38         depends on SERIAL_8250
  39         default y
  40         ---help---
  41           In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
  42           accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
  43           8250.nr_uarts=4. We now renamed the module back to 8250, but if
  44           anybody noticed in 3.7 and changed their userspace we still have to
  45           keep the 8250_core.* options around until they revert the changes
  46           they already did.
  47
  48           If 8250 is built as a module, this adds 8250_core alias instead.
  49
  50           If you did not notice yet and/or you have userspace from pre-3.7, it
  51           is safe (and recommended) to say N here.
  52
  53 config SERIAL_8250_PNP
  54         bool "8250/16550 PNP device support" if EXPERT
  55         depends on SERIAL_8250 && PNP
  56         default y
  57         ---help---
  58           This builds standard PNP serial support. You may be able to
  59           disable this feature if you only need legacy serial support.
  60
  61 config SERIAL_8250_FINTEK
  62         bool "Support for Fintek F81216A LPC to 4 UART RS485 API"
  63         depends on SERIAL_8250
  64         ---help---
  65           Selecting this option will add support for the RS485 capabilities
  66           of the Fintek F81216A LPC to 4 UART.
  67
  68           If this option is not selected the device will be configured as a
  69           standard 16550A serial port.
  70
  71           If unsure, say N.
  72
  73 config SERIAL_8250_CONSOLE
  74         bool "Console on 8250/16550 and compatible serial port"
  75         depends on SERIAL_8250=y
  76         select SERIAL_CORE_CONSOLE
  77         select SERIAL_EARLYCON
  78         ---help---
  79           If you say Y here, it will be possible to use a serial port as the
  80           system console (the system console is the device which receives all
  81           kernel messages and warnings and which allows logins in single user
  82           mode). This could be useful if some terminal or printer is connected
  83           to that serial port.
  84
  85           Even if you say Y here, the currently visible virtual console
  86           (/dev/tty0) will still be used as the system console by default, but
  87           you can alter that using a kernel command line option such as
  88           "console=ttyS1". (Try "man bootparam" or see the documentation of
  89           your boot loader (grub or lilo or loadlin) about how to pass options
  90           to the kernel at boot time.)
  91
  92           If you don't have a VGA card installed and you say Y here, the
  93           kernel will automatically use the first serial line, /dev/ttyS0, as
  94           system console.
  95
  96           You can set that using a kernel command line option such as
  97           "console=uart8250,io,0x3f8,9600n8"
  98           "console=uart8250,mmio,0xff5e0000,115200n8".
  99           and it will switch to normal serial console when the corresponding
 100           port is ready.
 101           "earlycon=uart8250,io,0x3f8,9600n8"
 102           "earlycon=uart8250,mmio,0xff5e0000,115200n8".
 103           it will not only setup early console.
 104
 105           If unsure, say N.
 106
 107 config SERIAL_8250_GSC
 108         tristate
 109         depends on SERIAL_8250 && GSC
 110         default SERIAL_8250
 111
 112 config SERIAL_8250_DMA
 113         bool "DMA support for 16550 compatible UART controllers" if EXPERT
 114         depends on SERIAL_8250 && DMADEVICES=y
 115         default SERIAL_8250
 116         help
 117           This builds DMA support that can be used with 8250/16650
 118           compatible UART controllers that support DMA signaling.
 119
 120 config SERIAL_8250_PCI
 121         tristate "8250/16550 PCI device support" if EXPERT
 122         depends on SERIAL_8250 && PCI
 123         default SERIAL_8250
 124         select RATIONAL
 125         help
 126           This builds standard PCI serial support. You may be able to
 127           disable this feature if you only need legacy serial support.
 128           Saves about 9K.
 129           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
 130           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
 131
 132 config SERIAL_8250_HP300
 133         tristate
 134         depends on SERIAL_8250 && HP300
 135         default SERIAL_8250
 136
 137 config SERIAL_8250_CS
 138         tristate "8250/16550 PCMCIA device support"
 139         depends on PCMCIA && SERIAL_8250
 140         ---help---
 141           Say Y here to enable support for 16-bit PCMCIA serial devices,
 142           including serial port cards, modems, and the modem functions of
 143           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
 144           credit-card size devices often used with laptops.)
 145
 146           To compile this driver as a module, choose M here: the
 147           module will be called serial_cs.
 148
 149           If unsure, say N.
 150
 151 config SERIAL_8250_NR_UARTS
 152         int "Maximum number of 8250/16550 serial ports"
 153         depends on SERIAL_8250
 154         default "4"
 155         help
 156           Set this to the number of serial ports you want the driver
 157           to support.  This includes any ports discovered via ACPI or
 158           PCI enumeration and any ports that may be added at run-time
 159           via hot-plug, or any ISA multi-port serial cards.
 160
 161 config SERIAL_8250_RUNTIME_UARTS
 162         int "Number of 8250/16550 serial ports to register at runtime"
 163         depends on SERIAL_8250
 164         range 0 SERIAL_8250_NR_UARTS
 165         default "4"
 166         help
 167           Set this to the maximum number of serial ports you want
 168           the kernel to register at boot time.  This can be overridden
 169           with the module parameter "nr_uarts", or boot-time parameter
 170           8250.nr_uarts
 171
 172 config SERIAL_8250_EXTENDED
 173         bool "Extended 8250/16550 serial driver options"
 174         depends on SERIAL_8250
 175         help
 176           If you wish to use any non-standard features of the standard "dumb"
 177           driver, say Y here. This includes HUB6 support, shared serial
 178           interrupts, special multiport support, support for more than the
 179           four COM 1/2/3/4 boards, etc.
 180
 181           Note that the answer to this question won't directly affect the
 182           kernel: saying N will just cause the configurator to skip all
 183           the questions about serial driver options. If unsure, say N.
 184
 185 config SERIAL_8250_MANY_PORTS
 186         bool "Support more than 4 legacy serial ports"
 187         depends on SERIAL_8250_EXTENDED && !IA64
 188         help
 189           Say Y here if you have dumb serial boards other than the four
 190           standard COM 1/2/3/4 ports. This may happen if you have an AST
 191           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
 192           from <http://www.tldp.org/docs.html#howto>), or other custom
 193           serial port hardware which acts similar to standard serial port
 194           hardware. If you only use the standard COM 1/2/3/4 ports, you can
 195           say N here to save some memory. You can also say Y if you have an
 196           "intelligent" multiport card such as Cyclades, Digiboards, etc.
 197
 198 #
 199 # Multi-port serial cards
 200 #
 201
 202 config SERIAL_8250_FOURPORT
 203         tristate "Support Fourport cards"
 204         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 205         help
 206           Say Y here if you have an AST FourPort serial board.
 207
 208           To compile this driver as a module, choose M here: the module
 209           will be called 8250_fourport.
 210
 211 config SERIAL_8250_ACCENT
 212         tristate "Support Accent cards"
 213         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 214         help
 215           Say Y here if you have an Accent Async serial board.
 216
 217           To compile this driver as a module, choose M here: the module
 218           will be called 8250_accent.
 219
 220 config SERIAL_8250_BOCA
 221         tristate "Support Boca cards"
 222         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 223         help
 224           Say Y here if you have a Boca serial board.  Please read the Boca
 225           mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
 226
 227           To compile this driver as a module, choose M here: the module
 228           will be called 8250_boca.
 229
 230 config SERIAL_8250_EXAR_ST16C554
 231         tristate "Support Exar ST16C554/554D Quad UART"
 232         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 233         help
 234           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
 235           tinkering with your Envoy TU301, or have a machine with this UART,
 236           say Y here.
 237
 238           To compile this driver as a module, choose M here: the module
 239           will be called 8250_exar_st16c554.
 240
 241 config SERIAL_8250_HUB6
 242         tristate "Support Hub6 cards"
 243         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 244         help
 245           Say Y here if you have a HUB6 serial board.
 246
 247           To compile this driver as a module, choose M here: the module
 248           will be called 8250_hub6.
 249
 250 #
 251 # Misc. options/drivers.
 252 #
 253
 254 config SERIAL_8250_SHARE_IRQ
 255         bool "Support for sharing serial interrupts"
 256         depends on SERIAL_8250_EXTENDED
 257         help
 258           Some serial boards have hardware support which allows multiple dumb
 259           serial ports on the same board to share a single IRQ. To enable
 260           support for this in the serial driver, say Y here.
 261
 262 config SERIAL_8250_DETECT_IRQ
 263         bool "Autodetect IRQ on standard ports (unsafe)"
 264         depends on SERIAL_8250_EXTENDED
 265         help
 266           Say Y here if you want the kernel to try to guess which IRQ
 267           to use for your serial port.
 268
 269           This is considered unsafe; it is far better to configure the IRQ in
 270           a boot script using the setserial command.
 271
 272           If unsure, say N.
 273
 274 config SERIAL_8250_RSA
 275         bool "Support RSA serial ports"
 276         depends on SERIAL_8250_EXTENDED
 277         help
 278           Say Y here if you have a IODATA RSA-DV II/S ISA card and
 279           would like to use its >115kbps speeds.
 280           You will need to provide module parameter "probe_rsa", or boot-time
 281           parameter 8250.probe_rsa with I/O addresses of this card then.
 282
 283           If you don't have such card, or if unsure, say N.
 284
 285 config SERIAL_8250_ACORN
 286         tristate "Acorn expansion card serial port support"
 287         depends on ARCH_ACORN && SERIAL_8250
 288         help
 289           If you have an Atomwide Serial card or Serial Port card for an Acorn
 290           system, say Y to this option.  The driver can handle 1, 2, or 3 port
 291           cards.  If unsure, say N.
 292
 293 config SERIAL_8250_BCM2835AUX
 294         tristate "BCM2835 auxiliar mini UART support"
 295         depends on ARCH_BCM2835 || COMPILE_TEST
 296         depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
 297         help
 298           Support for the BCM2835 auxiliar mini UART.
 299
 300           Features and limitations of the UART are
 301             Registers are similar to 16650 registers,
 302               set bits in the control registers that are unsupported
 303               are ignored and read back as 0
 304             7/8 bit operation with 1 start and 1 stop bit
 305             8 symbols deep fifo for rx and tx
 306             SW controlled RTS and SW readable CTS
 307             Clock rate derived from system clock
 308             Uses 8 times oversampling (compared to 16 times for 16650)
 309             Missing break detection (but break generation)
 310             Missing framing error detection
 311             Missing parity bit
 312             Missing receive time-out interrupt
 313             Missing DCD, DSR, DTR and RI signals
 314
 315           If unsure, say N.
 316
 317 config SERIAL_8250_FSL
 318         bool
 319         depends on SERIAL_8250_CONSOLE
 320         default PPC || ARM || ARM64
 321
 322 config SERIAL_8250_DW
 323         tristate "Support for Synopsys DesignWare 8250 quirks"
 324         depends on SERIAL_8250
 325         help
 326           Selecting this option will enable handling of the extra features
 327           present in the Synopsys DesignWare APB UART.
 328
 329 config SERIAL_8250_EM
 330         tristate "Support for Emma Mobile integrated serial port"
 331         depends on SERIAL_8250 && ARM && HAVE_CLK
 332         help
 333           Selecting this option will add support for the integrated serial
 334           port hardware found on the Emma Mobile line of processors.
 335           If unsure, say N.
 336
 337 config SERIAL_8250_RT288X
 338         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
 339         depends on SERIAL_8250
 340         default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
 341         help
 342           Selecting this option will add support for the alternate register
 343           layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
 344           If unsure, say N.
 345
 346 config SERIAL_8250_OMAP
 347         tristate "Support for OMAP internal UART (8250 based driver)"
 348         depends on SERIAL_8250 && ARCH_OMAP2PLUS
 349         help
 350           If you have a machine based on an Texas Instruments OMAP CPU you
 351           can enable its onboard serial ports by enabling this option.
 352
 353           This driver uses ttyS instead of ttyO.
 354
 355 config SERIAL_8250_OMAP_TTYO_FIXUP
 356         bool "Replace ttyO with ttyS"
 357         depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
 358         default y
 359         help
 360           This option replaces the "console=ttyO" argument with the matching
 361           ttyS argument if the user did not specified it on the command line.
 362           This ensures that the user can see the kernel output during boot
 363           which he wouldn't see otherwise. The getty has still to be configured
 364           for ttyS instead of ttyO regardless of this option.
 365           This option is intended for people who "automatically" enable this
 366           driver without knowing that this driver requires a different console=
 367           argument. If you read this, please keep this option disabled and
 368           instead update your kernel command line. If you prepare a kernel for a
 369           distribution or other kind of larger user base then you probably want
 370           to keep this option enabled. Otherwise people might complain about a
 371           not booting kernel because the serial console remains silent in case
 372           they forgot to update the command line.
 373
 374 config SERIAL_8250_LPC18XX
 375         tristate "NXP LPC18xx/43xx serial port support"
 376         depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
 377         default ARCH_LPC18XX
 378         help
 379           If you have a LPC18xx/43xx based board and want to use the
 380           serial port, say Y to this option. If unsure, say Y.
 381
 382 config SERIAL_8250_MT6577
 383         tristate "Mediatek serial port support"
 384         depends on SERIAL_8250 && ARCH_MEDIATEK
 385         help
 386           If you have a Mediatek based board and want to use the
 387           serial port, say Y to this option. If unsure, say N.
 388
 389 config SERIAL_8250_UNIPHIER
 390         tristate "Support for UniPhier on-chip UART"
 391         depends on SERIAL_8250
 392         depends on ARCH_UNIPHIER || COMPILE_TEST
 393         help
 394           If you have a UniPhier based board and want to use the on-chip
 395           serial ports, say Y to this option. If unsure, say N.
 396
 397 config SERIAL_8250_INGENIC
 398         tristate "Support for Ingenic SoC serial ports"
 399         depends on SERIAL_8250
 400         depends on OF_FLATTREE
 401         depends on MIPS || COMPILE_TEST
 402         help
 403           If you have a system using an Ingenic SoC and wish to make use of
 404           its UARTs, say Y to this option. If unsure, say N.
 405
 406 config SERIAL_8250_MID
 407         tristate "Support for serial ports on Intel MID platforms" if EXPERT
 408         default SERIAL_8250
 409         depends on SERIAL_8250 && PCI
 410         depends on X86 || COMPILE_TEST
 411         select HSU_DMA if SERIAL_8250_DMA
 412         select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
 413         select RATIONAL
 414         help
 415           Selecting this option will enable handling of the extra features
 416           present on the UART found on Intel Medfield SOC and various other
 417           Intel platforms.
 418
 419 config SERIAL_8250_MOXA
 420         tristate "MOXA SmartIO MUE support"
 421         depends on SERIAL_8250 && PCI
 422         help
 423           Say Y here if you have a Moxa SmartIO MUE multiport serial card.
 424           If unsure, say N.
 425
 426           This driver can also be built as a module. The module will be called
 427           8250_moxa. If you want to do that, say M here.
 428
 429 config SERIAL_OF_PLATFORM
 430         tristate "Devicetree based probing for 8250 ports"
 431         depends on SERIAL_8250 && OF
 432         help
 433           This option is used for all 8250 compatible serial ports that
 434           are probed through devicetree, including Open Firmware based
 435           PowerPC systems and embedded systems on architectures using the
 436           flattened device tree format.