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 and Stallion multi
  16           serial port drivers do not need this driver built in for them to
  17           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_PNP
  37         bool "8250/16550 PNP device support" if EXPERT
  38         depends on SERIAL_8250 && PNP
  39         default y
  40         ---help---
  41           This builds standard PNP serial support. You may be able to
  42           disable this feature if you only need legacy serial support.
  43
  44 config SERIAL_8250_CONSOLE
  45         bool "Console on 8250/16550 and compatible serial port"
  46         depends on SERIAL_8250=y
  47         select SERIAL_CORE_CONSOLE
  48         ---help---
  49           If you say Y here, it will be possible to use a serial port as the
  50           system console (the system console is the device which receives all
  51           kernel messages and warnings and which allows logins in single user
  52           mode). This could be useful if some terminal or printer is connected
  53           to that serial port.
  54
  55           Even if you say Y here, the currently visible virtual console
  56           (/dev/tty0) will still be used as the system console by default, but
  57           you can alter that using a kernel command line option such as
  58           "console=ttyS1". (Try "man bootparam" or see the documentation of
  59           your boot loader (grub or lilo or loadlin) about how to pass options
  60           to the kernel at boot time.)
  61
  62           If you don't have a VGA card installed and you say Y here, the
  63           kernel will automatically use the first serial line, /dev/ttyS0, as
  64           system console.
  65
  66           You can set that using a kernel command line option such as
  67           "console=uart8250,io,0x3f8,9600n8"
  68           "console=uart8250,mmio,0xff5e0000,115200n8".
  69           and it will switch to normal serial console when the corresponding
  70           port is ready.
  71           "earlycon=uart8250,io,0x3f8,9600n8"
  72           "earlycon=uart8250,mmio,0xff5e0000,115200n8".
  73           it will not only setup early console.
  74
  75           If unsure, say N.
  76
  77 config FIX_EARLYCON_MEM
  78         bool
  79         depends on X86
  80         default y
  81
  82 config SERIAL_8250_GSC
  83         tristate
  84         depends on SERIAL_8250 && GSC
  85         default SERIAL_8250
  86
  87 config SERIAL_8250_DMA
  88         bool "DMA support for 16550 compatible UART controllers" if EXPERT
  89         depends on SERIAL_8250 && DMADEVICES=y
  90         default SERIAL_8250
  91         help
  92           This builds DMA support that can be used with 8250/16650
  93           compatible UART controllers that support DMA signaling.
  94
  95 config SERIAL_8250_PCI
  96         tristate "8250/16550 PCI device support" if EXPERT
  97         depends on SERIAL_8250 && PCI
  98         default SERIAL_8250
  99         help
 100           This builds standard PCI serial support. You may be able to
 101           disable this feature if you only need legacy serial support.
 102           Saves about 9K.
 103
 104 config SERIAL_8250_HP300
 105         tristate
 106         depends on SERIAL_8250 && HP300
 107         default SERIAL_8250
 108
 109 config SERIAL_8250_CS
 110         tristate "8250/16550 PCMCIA device support"
 111         depends on PCMCIA && SERIAL_8250
 112         ---help---
 113           Say Y here to enable support for 16-bit PCMCIA serial devices,
 114           including serial port cards, modems, and the modem functions of
 115           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
 116           credit-card size devices often used with laptops.)
 117
 118           To compile this driver as a module, choose M here: the
 119           module will be called serial_cs.
 120
 121           If unsure, say N.
 122
 123 config SERIAL_8250_NR_UARTS
 124         int "Maximum number of 8250/16550 serial ports"
 125         depends on SERIAL_8250
 126         default "4"
 127         help
 128           Set this to the number of serial ports you want the driver
 129           to support.  This includes any ports discovered via ACPI or
 130           PCI enumeration and any ports that may be added at run-time
 131           via hot-plug, or any ISA multi-port serial cards.
 132
 133 config SERIAL_8250_RUNTIME_UARTS
 134         int "Number of 8250/16550 serial ports to register at runtime"
 135         depends on SERIAL_8250
 136         range 0 SERIAL_8250_NR_UARTS
 137         default "4"
 138         help
 139           Set this to the maximum number of serial ports you want
 140           the kernel to register at boot time.  This can be overridden
 141           with the module parameter "nr_uarts", or boot-time parameter
 142           8250.nr_uarts
 143
 144 config SERIAL_8250_EXTENDED
 145         bool "Extended 8250/16550 serial driver options"
 146         depends on SERIAL_8250
 147         help
 148           If you wish to use any non-standard features of the standard "dumb"
 149           driver, say Y here. This includes HUB6 support, shared serial
 150           interrupts, special multiport support, support for more than the
 151           four COM 1/2/3/4 boards, etc.
 152
 153           Note that the answer to this question won't directly affect the
 154           kernel: saying N will just cause the configurator to skip all
 155           the questions about serial driver options. If unsure, say N.
 156
 157 config SERIAL_8250_MANY_PORTS
 158         bool "Support more than 4 legacy serial ports"
 159         depends on SERIAL_8250_EXTENDED && !IA64
 160         help
 161           Say Y here if you have dumb serial boards other than the four
 162           standard COM 1/2/3/4 ports. This may happen if you have an AST
 163           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
 164           from <http://www.tldp.org/docs.html#howto>), or other custom
 165           serial port hardware which acts similar to standard serial port
 166           hardware. If you only use the standard COM 1/2/3/4 ports, you can
 167           say N here to save some memory. You can also say Y if you have an
 168           "intelligent" multiport card such as Cyclades, Digiboards, etc.
 169
 170 #
 171 # Multi-port serial cards
 172 #
 173
 174 config SERIAL_8250_FOURPORT
 175         tristate "Support Fourport cards"
 176         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 177         help
 178           Say Y here if you have an AST FourPort serial board.
 179
 180           To compile this driver as a module, choose M here: the module
 181           will be called 8250_fourport.
 182
 183 config SERIAL_8250_ACCENT
 184         tristate "Support Accent cards"
 185         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 186         help
 187           Say Y here if you have an Accent Async serial board.
 188
 189           To compile this driver as a module, choose M here: the module
 190           will be called 8250_accent.
 191
 192 config SERIAL_8250_BOCA
 193         tristate "Support Boca cards"
 194         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 195         help
 196           Say Y here if you have a Boca serial board.  Please read the Boca
 197           mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
 198
 199           To compile this driver as a module, choose M here: the module
 200           will be called 8250_boca.
 201
 202 config SERIAL_8250_EXAR_ST16C554
 203         tristate "Support Exar ST16C554/554D Quad UART"
 204         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 205         help
 206           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
 207           tinkering with your Envoy TU301, or have a machine with this UART,
 208           say Y here.
 209
 210           To compile this driver as a module, choose M here: the module
 211           will be called 8250_exar_st16c554.
 212
 213 config SERIAL_8250_HUB6
 214         tristate "Support Hub6 cards"
 215         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
 216         help
 217           Say Y here if you have a HUB6 serial board.
 218
 219           To compile this driver as a module, choose M here: the module
 220           will be called 8250_hub6.
 221
 222 #
 223 # Misc. options/drivers.
 224 #
 225
 226 config SERIAL_8250_SHARE_IRQ
 227         bool "Support for sharing serial interrupts"
 228         depends on SERIAL_8250_EXTENDED
 229         help
 230           Some serial boards have hardware support which allows multiple dumb
 231           serial ports on the same board to share a single IRQ. To enable
 232           support for this in the serial driver, say Y here.
 233
 234 config SERIAL_8250_DETECT_IRQ
 235         bool "Autodetect IRQ on standard ports (unsafe)"
 236         depends on SERIAL_8250_EXTENDED
 237         help
 238           Say Y here if you want the kernel to try to guess which IRQ
 239           to use for your serial port.
 240
 241           This is considered unsafe; it is far better to configure the IRQ in
 242           a boot script using the setserial command.
 243
 244           If unsure, say N.
 245
 246 config SERIAL_8250_RSA
 247         bool "Support RSA serial ports"
 248         depends on SERIAL_8250_EXTENDED
 249         help
 250           ::: To be written :::
 251
 252 config SERIAL_8250_ACORN
 253         tristate "Acorn expansion card serial port support"
 254         depends on ARCH_ACORN && SERIAL_8250
 255         help
 256           If you have an Atomwide Serial card or Serial Port card for an Acorn
 257           system, say Y to this option.  The driver can handle 1, 2, or 3 port
 258           cards.  If unsure, say N.
 259
 260 config SERIAL_8250_FSL
 261         bool
 262         depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
 263         default PPC
 264
 265 config SERIAL_8250_DW
 266         tristate "Support for Synopsys DesignWare 8250 quirks"
 267         depends on SERIAL_8250
 268         help
 269           Selecting this option will enable handling of the extra features
 270           present in the Synopsys DesignWare APB UART.
 271
 272 config SERIAL_8250_EM
 273         tristate "Support for Emma Mobile integrated serial port"
 274         depends on SERIAL_8250 && ARM && HAVE_CLK
 275         help
 276           Selecting this option will add support for the integrated serial
 277           port hardware found on the Emma Mobile line of processors.
 278           If unsure, say N.
 279
 280 config SERIAL_8250_RT288X
 281         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
 282         depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
 283         help
 284           If you have a Ralink RT288x/RT305x SoC based board and want to use the
 285           serial port, say Y to this option. The driver can handle up to 2 serial
 286           ports. If unsure, say N.