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_CONSOLE 37 bool "Console on 8250/16550 and compatible serial port" 38 depends on SERIAL_8250=y 39 select SERIAL_CORE_CONSOLE 40 ---help--- 41 If you say Y here, it will be possible to use a serial port as the 42 system console (the system console is the device which receives all 43 kernel messages and warnings and which allows logins in single user 44 mode). This could be useful if some terminal or printer is connected 45 to that serial port. 46 47 Even if you say Y here, the currently visible virtual console 48 (/dev/tty0) will still be used as the system console by default, but 49 you can alter that using a kernel command line option such as 50 "console=ttyS1". (Try "man bootparam" or see the documentation of 51 your boot loader (grub or lilo or loadlin) about how to pass options 52 to the kernel at boot time.) 53 54 If you don't have a VGA card installed and you say Y here, the 55 kernel will automatically use the first serial line, /dev/ttyS0, as 56 system console. 57 58 You can set that using a kernel command line option such as 59 "console=uart8250,io,0x3f8,9600n8" 60 "console=uart8250,mmio,0xff5e0000,115200n8". 61 and it will switch to normal serial console when the corresponding 62 port is ready. 63 "earlycon=uart8250,io,0x3f8,9600n8" 64 "earlycon=uart8250,mmio,0xff5e0000,115200n8". 65 it will not only setup early console. 66 67 If unsure, say N. 68 69config FIX_EARLYCON_MEM 70 bool 71 depends on X86 72 default y 73 74config SERIAL_8250_GSC 75 tristate 76 depends on SERIAL_8250 && GSC 77 default SERIAL_8250 78 79config SERIAL_8250_PCI 80 tristate "8250/16550 PCI device support" if EXPERT 81 depends on SERIAL_8250 && PCI 82 default SERIAL_8250 83 help 84 This builds standard PCI serial support. You may be able to 85 disable this feature if you only need legacy serial support. 86 Saves about 9K. 87 88config SERIAL_8250_PNP 89 tristate "8250/16550 PNP device support" if EXPERT 90 depends on SERIAL_8250 && PNP 91 default SERIAL_8250 92 help 93 This builds standard PNP serial support. You may be able to 94 disable this feature if you only need legacy serial support. 95 96config SERIAL_8250_HP300 97 tristate 98 depends on SERIAL_8250 && HP300 99 default SERIAL_8250 100 101config SERIAL_8250_CS 102 tristate "8250/16550 PCMCIA device support" 103 depends on PCMCIA && SERIAL_8250 104 ---help--- 105 Say Y here to enable support for 16-bit PCMCIA serial devices, 106 including serial port cards, modems, and the modem functions of 107 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 108 credit-card size devices often used with laptops.) 109 110 To compile this driver as a module, choose M here: the 111 module will be called serial_cs. 112 113 If unsure, say N. 114 115config SERIAL_8250_NR_UARTS 116 int "Maximum number of 8250/16550 serial ports" 117 depends on SERIAL_8250 118 default "4" 119 help 120 Set this to the number of serial ports you want the driver 121 to support. This includes any ports discovered via ACPI or 122 PCI enumeration and any ports that may be added at run-time 123 via hot-plug, or any ISA multi-port serial cards. 124 125config SERIAL_8250_RUNTIME_UARTS 126 int "Number of 8250/16550 serial ports to register at runtime" 127 depends on SERIAL_8250 128 range 0 SERIAL_8250_NR_UARTS 129 default "4" 130 help 131 Set this to the maximum number of serial ports you want 132 the kernel to register at boot time. This can be overridden 133 with the module parameter "nr_uarts", or boot-time parameter 134 8250.nr_uarts 135 136config SERIAL_8250_EXTENDED 137 bool "Extended 8250/16550 serial driver options" 138 depends on SERIAL_8250 139 help 140 If you wish to use any non-standard features of the standard "dumb" 141 driver, say Y here. This includes HUB6 support, shared serial 142 interrupts, special multiport support, support for more than the 143 four COM 1/2/3/4 boards, etc. 144 145 Note that the answer to this question won't directly affect the 146 kernel: saying N will just cause the configurator to skip all 147 the questions about serial driver options. If unsure, say N. 148 149config SERIAL_8250_MANY_PORTS 150 bool "Support more than 4 legacy serial ports" 151 depends on SERIAL_8250_EXTENDED && !IA64 152 help 153 Say Y here if you have dumb serial boards other than the four 154 standard COM 1/2/3/4 ports. This may happen if you have an AST 155 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 156 from <http://www.tldp.org/docs.html#howto>), or other custom 157 serial port hardware which acts similar to standard serial port 158 hardware. If you only use the standard COM 1/2/3/4 ports, you can 159 say N here to save some memory. You can also say Y if you have an 160 "intelligent" multiport card such as Cyclades, Digiboards, etc. 161 162# 163# Multi-port serial cards 164# 165 166config SERIAL_8250_FOURPORT 167 tristate "Support Fourport cards" 168 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 169 help 170 Say Y here if you have an AST FourPort serial board. 171 172 To compile this driver as a module, choose M here: the module 173 will be called 8250_fourport. 174 175config SERIAL_8250_ACCENT 176 tristate "Support Accent cards" 177 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 178 help 179 Say Y here if you have an Accent Async serial board. 180 181 To compile this driver as a module, choose M here: the module 182 will be called 8250_accent. 183 184config SERIAL_8250_BOCA 185 tristate "Support Boca cards" 186 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 187 help 188 Say Y here if you have a Boca serial board. Please read the Boca 189 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 190 191 To compile this driver as a module, choose M here: the module 192 will be called 8250_boca. 193 194config SERIAL_8250_EXAR_ST16C554 195 tristate "Support Exar ST16C554/554D Quad UART" 196 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 197 help 198 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 199 tinkering with your Envoy TU301, or have a machine with this UART, 200 say Y here. 201 202 To compile this driver as a module, choose M here: the module 203 will be called 8250_exar_st16c554. 204 205config SERIAL_8250_HUB6 206 tristate "Support Hub6 cards" 207 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 208 help 209 Say Y here if you have a HUB6 serial board. 210 211 To compile this driver as a module, choose M here: the module 212 will be called 8250_hub6. 213 214# 215# Misc. options/drivers. 216# 217 218config SERIAL_8250_SHARE_IRQ 219 bool "Support for sharing serial interrupts" 220 depends on SERIAL_8250_EXTENDED 221 help 222 Some serial boards have hardware support which allows multiple dumb 223 serial ports on the same board to share a single IRQ. To enable 224 support for this in the serial driver, say Y here. 225 226config SERIAL_8250_DETECT_IRQ 227 bool "Autodetect IRQ on standard ports (unsafe)" 228 depends on SERIAL_8250_EXTENDED 229 help 230 Say Y here if you want the kernel to try to guess which IRQ 231 to use for your serial port. 232 233 This is considered unsafe; it is far better to configure the IRQ in 234 a boot script using the setserial command. 235 236 If unsure, say N. 237 238config SERIAL_8250_RSA 239 bool "Support RSA serial ports" 240 depends on SERIAL_8250_EXTENDED 241 help 242 ::: To be written ::: 243 244config SERIAL_8250_MCA 245 tristate "Support 8250-type ports on MCA buses" 246 depends on SERIAL_8250 != n && MCA 247 help 248 Say Y here if you have a MCA serial ports. 249 250 To compile this driver as a module, choose M here: the module 251 will be called 8250_mca. 252 253config SERIAL_8250_ACORN 254 tristate "Acorn expansion card serial port support" 255 depends on ARCH_ACORN && SERIAL_8250 256 help 257 If you have an Atomwide Serial card or Serial Port card for an Acorn 258 system, say Y to this option. The driver can handle 1, 2, or 3 port 259 cards. If unsure, say N. 260 261config SERIAL_8250_RM9K 262 bool "Support for MIPS RM9xxx integrated serial port" 263 depends on SERIAL_8250 != n && SERIAL_RM9000 264 select SERIAL_8250_SHARE_IRQ 265 help 266 Selecting this option will add support for the integrated serial 267 port hardware found on MIPS RM9122 and similar processors. 268 If unsure, say N. 269 270config SERIAL_8250_FSL 271 bool 272 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 273 default PPC 274 275config SERIAL_8250_DW 276 tristate "Support for Synopsys DesignWare 8250 quirks" 277 depends on SERIAL_8250 && OF 278 help 279 Selecting this option will enable handling of the extra features 280 present in the Synopsys DesignWare APB UART. 281