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 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 35config 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 52config 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 60config 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 94config SERIAL_8250_GSC 95 tristate 96 depends on SERIAL_8250 && GSC 97 default SERIAL_8250 98 99config 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 107config 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 118config SERIAL_8250_HP300 119 tristate 120 depends on SERIAL_8250 && HP300 121 default SERIAL_8250 122 123config 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 137config 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 147config 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 158config 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 171config 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 188config 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 197config 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 206config 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 216config 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 227config 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 240config 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 248config 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 260config SERIAL_8250_RSA 261 bool "Support RSA serial ports" 262 depends on SERIAL_8250_EXTENDED 263 help 264 ::: To be written ::: 265 266config 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 274config SERIAL_8250_FSL 275 bool 276 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 277 default PPC 278 279config 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 286config 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 294config SERIAL_8250_RT288X 295 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 296 depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883) 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