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 6config 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 36config 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 44config 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 77config FIX_EARLYCON_MEM 78 bool 79 depends on X86 80 default y 81 82config SERIAL_8250_GSC 83 tristate 84 depends on SERIAL_8250 && GSC 85 default SERIAL_8250 86 87config 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 95config 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 104config SERIAL_8250_HP300 105 tristate 106 depends on SERIAL_8250 && HP300 107 default SERIAL_8250 108 109config 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 123config 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 133config 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 144config 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 157config 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 174config 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 183config 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 192config 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 202config 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 213config 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 226config 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 234config 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 246config SERIAL_8250_RSA 247 bool "Support RSA serial ports" 248 depends on SERIAL_8250_EXTENDED 249 help 250 ::: To be written ::: 251 252config 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 260config SERIAL_8250_FSL 261 bool 262 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 263 default PPC 264 265config 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 272config 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 280config 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. 287