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"
 121         depends on SERIAL_8250 && PCI
 122         default SERIAL_8250
 123         help
 124           This builds standard PCI serial support. You may be able to
 125           disable this feature if you only need legacy serial support.
 126           Saves about 9K.
 127           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
 128           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
 129
 130 config SERIAL_8250_EXAR
 131         tristate "8250/16550 PCI device support"
 132         depends on SERIAL_8250_PCI
 133         default SERIAL_8250
 134
 135 config SERIAL_8250_HP300
 136         tristate
 137         depends on SERIAL_8250 && HP300
 138         default SERIAL_8250
 139
 140 config SERIAL_8250_CS
 141         tristate "8250/16550 PCMCIA device support"
 142         depends on PCMCIA && SERIAL_8250
 143         ---help---
 144           Say Y here to enable support for 16-bit PCMCIA serial devices,
 145           including serial port cards, modems, and the modem functions of
 146           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
 147           credit-card size devices often used with laptops.)
 148
 149           To compile this driver as a module, choose M here: the
 150           module will be called serial_cs.
 151
 152           If unsure, say N.
 153
 154 config SERIAL_8250_NR_UARTS
 155         int "Maximum number of 8250/16550 serial ports"
 156         depends on SERIAL_8250
 157         default "4"
 158         help
 159           Set this to the number of serial ports you want the driver
 160           to support.  This includes any ports discovered via ACPI or
 161           PCI enumeration and any ports that may be added at run-time
 162           via hot-plug, or any ISA multi-port serial cards.
 163
 164 config SERIAL_8250_RUNTIME_UARTS
 165         int "Number of 8250/16550 serial ports to register at runtime"
 166         depends on SERIAL_8250
 167         range 0 SERIAL_8250_NR_UARTS
 168         default "4"
 169         help
 170           Set this to the maximum number of serial ports you want
 171           the kernel to register at boot time.  This can be overridden
 172           with the module parameter "nr_uarts", or boot-time parameter
 173           8250.nr_uarts
 174
 175 config SERIAL_8250_EXTENDED
 176         bool "Extended 8250/16550 serial driver options"
 177         depends on SERIAL_8250
 178         help
 179           If you wish to use any non-standard features of the standard "dumb"
 180           driver, say Y here. This includes HUB6 support, shared serial
 181           interrupts, special multiport support, support for more than the
 182           four COM 1/2/3/4 boards, etc.
 183
 184           Note that the answer to this question won't directly affect the
 185           kernel: saying N will just cause the configurator to skip all
 186           the questions about serial driver options. If unsure, say N.
 187
 188 config SERIAL_8250_MANY_PORTS
 189         bool "Support more than 4 legacy serial ports"
 190         depends on SERIAL_8250_EXTENDED && !IA64
 191         help
 192           Say Y here if you have dumb serial boards other than the four
 193           standard COM 1/2/3/4 ports. This may happen if you have an AST
 194           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
 195           from <http://www.tldp.org/docs.html#howto>), or other custom
 196           serial port hardware which acts similar to standard serial port
 197           hardware. If you only use the standard COM 1/2/3/4 ports, you can
 198           say N here to save some memory. You can also say Y if you have an
 199           "intelligent" multiport card such as Cyclades, Digiboards, etc.
 200
 201 #
 202 # Multi-port serial cards
 203 #
 204
 205 config SERIAL_8250_FOURPORT
 206         tristate "Support Fourport cards"
 207         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 208         help
 209           Say Y here if you have an AST FourPort serial board.
 210
 211           To compile this driver as a module, choose M here: the module
 212           will be called 8250_fourport.
 213
 214 config SERIAL_8250_ACCENT
 215         tristate "Support Accent cards"
 216         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 217         help
 218           Say Y here if you have an Accent Async serial board.
 219
 220           To compile this driver as a module, choose M here: the module
 221           will be called 8250_accent.
 222
 223 config SERIAL_8250_BOCA
 224         tristate "Support Boca cards"
 225         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 226         help
 227           Say Y here if you have a Boca serial board.  Please read the Boca
 228           mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
 229
 230           To compile this driver as a module, choose M here: the module
 231           will be called 8250_boca.
 232
 233 config SERIAL_8250_EXAR_ST16C554
 234         tristate "Support Exar ST16C554/554D Quad UART"
 235         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 236         help
 237           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
 238           tinkering with your Envoy TU301, or have a machine with this UART,
 239           say Y here.
 240
 241           To compile this driver as a module, choose M here: the module
 242           will be called 8250_exar_st16c554.
 243
 244 config SERIAL_8250_HUB6
 245         tristate "Support Hub6 cards"
 246         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 247         help
 248           Say Y here if you have a HUB6 serial board.
 249
 250           To compile this driver as a module, choose M here: the module
 251           will be called 8250_hub6.
 252
 253 #
 254 # Misc. options/drivers.
 255 #
 256
 257 config SERIAL_8250_SHARE_IRQ
 258         bool "Support for sharing serial interrupts"
 259         depends on SERIAL_8250_EXTENDED
 260         help
 261           Some serial boards have hardware support which allows multiple dumb
 262           serial ports on the same board to share a single IRQ. To enable
 263           support for this in the serial driver, say Y here.
 264
 265 config SERIAL_8250_DETECT_IRQ
 266         bool "Autodetect IRQ on standard ports (unsafe)"
 267         depends on SERIAL_8250_EXTENDED
 268         help
 269           Say Y here if you want the kernel to try to guess which IRQ
 270           to use for your serial port.
 271
 272           This is considered unsafe; it is far better to configure the IRQ in
 273           a boot script using the setserial command.
 274
 275           If unsure, say N.
 276
 277 config SERIAL_8250_RSA
 278         bool "Support RSA serial ports"
 279         depends on SERIAL_8250_EXTENDED
 280         help
 281           Say Y here if you have a IODATA RSA-DV II/S ISA card and
 282           would like to use its >115kbps speeds.
 283           You will need to provide module parameter "probe_rsa", or boot-time
 284           parameter 8250.probe_rsa with I/O addresses of this card then.
 285
 286           If you don't have such card, or if unsure, say N.
 287
 288 config SERIAL_8250_ACORN
 289         tristate "Acorn expansion card serial port support"
 290         depends on ARCH_ACORN && SERIAL_8250
 291         help
 292           If you have an Atomwide Serial card or Serial Port card for an Acorn
 293           system, say Y to this option.  The driver can handle 1, 2, or 3 port
 294           cards.  If unsure, say N.
 295
 296 config SERIAL_8250_BCM2835AUX
 297         tristate "BCM2835 auxiliar mini UART support"
 298         depends on ARCH_BCM2835 || COMPILE_TEST
 299         depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
 300         help
 301           Support for the BCM2835 auxiliar mini UART.
 302
 303           Features and limitations of the UART are
 304             Registers are similar to 16650 registers,
 305               set bits in the control registers that are unsupported
 306               are ignored and read back as 0
 307             7/8 bit operation with 1 start and 1 stop bit
 308             8 symbols deep fifo for rx and tx
 309             SW controlled RTS and SW readable CTS
 310             Clock rate derived from system clock
 311             Uses 8 times oversampling (compared to 16 times for 16650)
 312             Missing break detection (but break generation)
 313             Missing framing error detection
 314             Missing parity bit
 315             Missing receive time-out interrupt
 316             Missing DCD, DSR, DTR and RI signals
 317
 318           If unsure, say N.
 319
 320 config SERIAL_8250_FSL
 321         bool
 322         depends on SERIAL_8250_CONSOLE
 323         default PPC || ARM || ARM64
 324
 325 config SERIAL_8250_DW
 326         tristate "Support for Synopsys DesignWare 8250 quirks"
 327         depends on SERIAL_8250
 328         help
 329           Selecting this option will enable handling of the extra features
 330           present in the Synopsys DesignWare APB UART.
 331
 332 config SERIAL_8250_EM
 333         tristate "Support for Emma Mobile integrated serial port"
 334         depends on SERIAL_8250 && ARM && HAVE_CLK
 335         help
 336           Selecting this option will add support for the integrated serial
 337           port hardware found on the Emma Mobile line of processors.
 338           If unsure, say N.
 339
 340 config SERIAL_8250_RT288X
 341         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
 342         depends on SERIAL_8250
 343         default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
 344         help
 345           Selecting this option will add support for the alternate register
 346           layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
 347           If unsure, say N.
 348
 349 config SERIAL_8250_OMAP
 350         tristate "Support for OMAP internal UART (8250 based driver)"
 351         depends on SERIAL_8250 && ARCH_OMAP2PLUS
 352         help
 353           If you have a machine based on an Texas Instruments OMAP CPU you
 354           can enable its onboard serial ports by enabling this option.
 355
 356           This driver uses ttyS instead of ttyO.
 357
 358 config SERIAL_8250_OMAP_TTYO_FIXUP
 359         bool "Replace ttyO with ttyS"
 360         depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
 361         default y
 362         help
 363           This option replaces the "console=ttyO" argument with the matching
 364           ttyS argument if the user did not specified it on the command line.
 365           This ensures that the user can see the kernel output during boot
 366           which he wouldn't see otherwise. The getty has still to be configured
 367           for ttyS instead of ttyO regardless of this option.
 368           This option is intended for people who "automatically" enable this
 369           driver without knowing that this driver requires a different console=
 370           argument. If you read this, please keep this option disabled and
 371           instead update your kernel command line. If you prepare a kernel for a
 372           distribution or other kind of larger user base then you probably want
 373           to keep this option enabled. Otherwise people might complain about a
 374           not booting kernel because the serial console remains silent in case
 375           they forgot to update the command line.
 376
 377 config SERIAL_8250_LPC18XX
 378         tristate "NXP LPC18xx/43xx serial port support"
 379         depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
 380         default ARCH_LPC18XX
 381         help
 382           If you have a LPC18xx/43xx based board and want to use the
 383           serial port, say Y to this option. If unsure, say Y.
 384
 385 config SERIAL_8250_MT6577
 386         tristate "Mediatek serial port support"
 387         depends on SERIAL_8250 && ARCH_MEDIATEK
 388         help
 389           If you have a Mediatek based board and want to use the
 390           serial port, say Y to this option. If unsure, say N.
 391
 392 config SERIAL_8250_UNIPHIER
 393         tristate "Support for UniPhier on-chip UART"
 394         depends on SERIAL_8250
 395         depends on ARCH_UNIPHIER || COMPILE_TEST
 396         help
 397           If you have a UniPhier based board and want to use the on-chip
 398           serial ports, say Y to this option. If unsure, say N.
 399
 400 config SERIAL_8250_INGENIC
 401         tristate "Support for Ingenic SoC serial ports"
 402         depends on SERIAL_8250
 403         depends on OF_FLATTREE
 404         depends on MIPS || COMPILE_TEST
 405         help
 406           If you have a system using an Ingenic SoC and wish to make use of
 407           its UARTs, say Y to this option. If unsure, say N.
 408
 409 config SERIAL_8250_LPSS
 410         tristate "Support for serial ports on Intel LPSS platforms"
 411         default SERIAL_8250
 412         depends on SERIAL_8250 && PCI
 413         depends on X86 || COMPILE_TEST
 414         select DW_DMAC_CORE if SERIAL_8250_DMA
 415         select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)
 416         select RATIONAL
 417         help
 418           Selecting this option will enable handling of the extra features
 419           present on the UART found on various Intel platforms such as:
 420             - Intel Baytrail SoC
 421             - Intel Braswell SoC
 422             - Intel Quark X1000 SoC
 423
 424 config SERIAL_8250_MID
 425         tristate "Support for serial ports on Intel MID platforms"
 426         default SERIAL_8250
 427         depends on SERIAL_8250 && PCI
 428         depends on X86 || COMPILE_TEST
 429         select HSU_DMA if SERIAL_8250_DMA
 430         select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
 431         select RATIONAL
 432         help
 433           Selecting this option will enable handling of the extra features
 434           present on the UART found on Intel Medfield SOC and various other
 435           Intel platforms.
 436
 437 config SERIAL_8250_MOXA
 438         tristate "MOXA SmartIO MUE support"
 439         depends on SERIAL_8250 && PCI
 440         help
 441           Say Y here if you have a Moxa SmartIO MUE multiport serial card.
 442           If unsure, say N.
 443
 444           This driver can also be built as a module. The module will be called
 445           8250_moxa. If you want to do that, say M here.
 446
 447 config SERIAL_8250_PXA
 448         tristate "PXA serial port support"
 449         depends on SERIAL_8250
 450         depends on ARCH_PXA || ARCH_MMP
 451         help
 452           If you have a machine based on an Intel XScale PXA2xx CPU you can
 453           enable its onboard serial ports by enabling this option. The option is
 454           applicable to both devicetree and legacy boards, and early console is
 455           part of its support.
 456
 457 config SERIAL_OF_PLATFORM
 458         tristate "Devicetree based probing for 8250 ports"
 459         depends on SERIAL_8250 && OF
 460         help
 461           This option is used for all 8250 compatible serial ports that
 462           are probed through devicetree, including Open Firmware based
 463           PowerPC systems and embedded systems on architectures using the
 464           flattened device tree format.