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