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         help
 112           This builds standard PCI serial support. You may be able to
 113           disable this feature if you only need legacy serial support.
 114           Saves about 9K.
 115           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
 116           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
 117
 118 config SERIAL_8250_HP300
 119         tristate
 120         depends on SERIAL_8250 && HP300
 121         default SERIAL_8250
 122
 123 config SERIAL_8250_CS
 124         tristate "8250/16550 PCMCIA device support"
 125         depends on PCMCIA && SERIAL_8250
 126         ---help---
 127           Say Y here to enable support for 16-bit PCMCIA serial devices,
 128           including serial port cards, modems, and the modem functions of
 129           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
 130           credit-card size devices often used with laptops.)
 131
 132           To compile this driver as a module, choose M here: the
 133           module will be called serial_cs.
 134
 135           If unsure, say N.
 136
 137 config SERIAL_8250_NR_UARTS
 138         int "Maximum number of 8250/16550 serial ports"
 139         depends on SERIAL_8250
 140         default "4"
 141         help
 142           Set this to the number of serial ports you want the driver
 143           to support.  This includes any ports discovered via ACPI or
 144           PCI enumeration and any ports that may be added at run-time
 145           via hot-plug, or any ISA multi-port serial cards.
 146
 147 config SERIAL_8250_RUNTIME_UARTS
 148         int "Number of 8250/16550 serial ports to register at runtime"
 149         depends on SERIAL_8250
 150         range 0 SERIAL_8250_NR_UARTS
 151         default "4"
 152         help
 153           Set this to the maximum number of serial ports you want
 154           the kernel to register at boot time.  This can be overridden
 155           with the module parameter "nr_uarts", or boot-time parameter
 156           8250.nr_uarts
 157
 158 config SERIAL_8250_EXTENDED
 159         bool "Extended 8250/16550 serial driver options"
 160         depends on SERIAL_8250
 161         help
 162           If you wish to use any non-standard features of the standard "dumb"
 163           driver, say Y here. This includes HUB6 support, shared serial
 164           interrupts, special multiport support, support for more than the
 165           four COM 1/2/3/4 boards, etc.
 166
 167           Note that the answer to this question won't directly affect the
 168           kernel: saying N will just cause the configurator to skip all
 169           the questions about serial driver options. If unsure, say N.
 170
 171 config SERIAL_8250_MANY_PORTS
 172         bool "Support more than 4 legacy serial ports"
 173         depends on SERIAL_8250_EXTENDED && !IA64
 174         help
 175           Say Y here if you have dumb serial boards other than the four
 176           standard COM 1/2/3/4 ports. This may happen if you have an AST
 177           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
 178           from <http://www.tldp.org/docs.html#howto>), or other custom
 179           serial port hardware which acts similar to standard serial port
 180           hardware. If you only use the standard COM 1/2/3/4 ports, you can
 181           say N here to save some memory. You can also say Y if you have an
 182           "intelligent" multiport card such as Cyclades, Digiboards, etc.
 183
 184 #
 185 # Multi-port serial cards
 186 #
 187
 188 config SERIAL_8250_FOURPORT
 189         tristate "Support Fourport cards"
 190         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 191         help
 192           Say Y here if you have an AST FourPort serial board.
 193
 194           To compile this driver as a module, choose M here: the module
 195           will be called 8250_fourport.
 196
 197 config SERIAL_8250_ACCENT
 198         tristate "Support Accent cards"
 199         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 200         help
 201           Say Y here if you have an Accent Async serial board.
 202
 203           To compile this driver as a module, choose M here: the module
 204           will be called 8250_accent.
 205
 206 config SERIAL_8250_BOCA
 207         tristate "Support Boca cards"
 208         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 209         help
 210           Say Y here if you have a Boca serial board.  Please read the Boca
 211           mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
 212
 213           To compile this driver as a module, choose M here: the module
 214           will be called 8250_boca.
 215
 216 config SERIAL_8250_EXAR_ST16C554
 217         tristate "Support Exar ST16C554/554D Quad UART"
 218         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 219         help
 220           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
 221           tinkering with your Envoy TU301, or have a machine with this UART,
 222           say Y here.
 223
 224           To compile this driver as a module, choose M here: the module
 225           will be called 8250_exar_st16c554.
 226
 227 config SERIAL_8250_HUB6
 228         tristate "Support Hub6 cards"
 229         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 230         help
 231           Say Y here if you have a HUB6 serial board.
 232
 233           To compile this driver as a module, choose M here: the module
 234           will be called 8250_hub6.
 235
 236 #
 237 # Misc. options/drivers.
 238 #
 239
 240 config SERIAL_8250_SHARE_IRQ
 241         bool "Support for sharing serial interrupts"
 242         depends on SERIAL_8250_EXTENDED
 243         help
 244           Some serial boards have hardware support which allows multiple dumb
 245           serial ports on the same board to share a single IRQ. To enable
 246           support for this in the serial driver, say Y here.
 247
 248 config SERIAL_8250_DETECT_IRQ
 249         bool "Autodetect IRQ on standard ports (unsafe)"
 250         depends on SERIAL_8250_EXTENDED
 251         help
 252           Say Y here if you want the kernel to try to guess which IRQ
 253           to use for your serial port.
 254
 255           This is considered unsafe; it is far better to configure the IRQ in
 256           a boot script using the setserial command.
 257
 258           If unsure, say N.
 259
 260 config SERIAL_8250_RSA
 261         bool "Support RSA serial ports"
 262         depends on SERIAL_8250_EXTENDED
 263         help
 264           ::: To be written :::
 265
 266 config SERIAL_8250_ACORN
 267         tristate "Acorn expansion card serial port support"
 268         depends on ARCH_ACORN && SERIAL_8250
 269         help
 270           If you have an Atomwide Serial card or Serial Port card for an Acorn
 271           system, say Y to this option.  The driver can handle 1, 2, or 3 port
 272           cards.  If unsure, say N.
 273
 274 config SERIAL_8250_FSL
 275         bool
 276         depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
 277         default PPC
 278
 279 config SERIAL_8250_DW
 280         tristate "Support for Synopsys DesignWare 8250 quirks"
 281         depends on SERIAL_8250
 282         help
 283           Selecting this option will enable handling of the extra features
 284           present in the Synopsys DesignWare APB UART.
 285
 286 config SERIAL_8250_EM
 287         tristate "Support for Emma Mobile integrated serial port"
 288         depends on SERIAL_8250 && ARM && HAVE_CLK
 289         help
 290           Selecting this option will add support for the integrated serial
 291           port hardware found on the Emma Mobile line of processors.
 292           If unsure, say N.
 293
 294 config SERIAL_8250_RT288X
 295         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
 296         depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620)
 297         help
 298           If you have a Ralink RT288x/RT305x SoC based board and want to use the
 299           serial port, say Y to this option. The driver can handle up to 2 serial
 300           ports. If unsure, say N.
 301
 302 config SERIAL_8250_OMAP
 303         tristate "Support for OMAP internal UART (8250 based driver)"
 304         depends on SERIAL_8250 && ARCH_OMAP2PLUS
 305         help
 306           If you have a machine based on an Texas Instruments OMAP CPU you
 307           can enable its onboard serial ports by enabling this option.
 308
 309           This driver uses ttyS instead of ttyO.
 310
 311 config SERIAL_8250_OMAP_TTYO_FIXUP
 312         bool "Replace ttyO with ttyS"
 313         depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
 314         default y
 315         help
 316           This option replaces the "console=ttyO" argument with the matching
 317           ttyS argument if the user did not specified it on the command line.
 318           This ensures that the user can see the kernel output during boot
 319           which he wouldn't see otherwise. The getty has still to be configured
 320           for ttyS instead of ttyO regardless of this option.
 321           This option is intended for people who "automatically" enable this
 322           driver without knowing that this driver requires a different console=
 323           argument. If you read this, please keep this option disabled and
 324           instead update your kernel command line. If you prepare a kernel for a
 325           distribution or other kind of larger user base then you probably want
 326           to keep this option enabled. Otherwise people might complain about a
 327           not booting kernel because the serial console remains silent in case
 328           they forgot to update the command line.
 329
 330 config SERIAL_8250_FINTEK
 331         tristate "Support for Fintek F81216A LPC to 4 UART"
 332         depends on SERIAL_8250 && PNP
 333         help
 334           Selecting this option will add support for the Fintek F81216A
 335           LPC to 4 UART. This device has some RS485 functionality not available
 336           through the PNP driver. If unsure, say N.
 337
 338 config SERIAL_8250_MT6577
 339         bool "Mediatek serial port support"
 340         depends on SERIAL_8250 && ARCH_MEDIATEK
 341         help
 342           If you have a Mediatek based board and want to use the
 343           serial port, say Y to this option. If unsure, say N.