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 8350_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 ---help--- 65 If you say Y here, it will be possible to use a serial port as the 66 system console (the system console is the device which receives all 67 kernel messages and warnings and which allows logins in single user 68 mode). This could be useful if some terminal or printer is connected 69 to that serial port. 70 71 Even if you say Y here, the currently visible virtual console 72 (/dev/tty0) will still be used as the system console by default, but 73 you can alter that using a kernel command line option such as 74 "console=ttyS1". (Try "man bootparam" or see the documentation of 75 your boot loader (grub or lilo or loadlin) about how to pass options 76 to the kernel at boot time.) 77 78 If you don't have a VGA card installed and you say Y here, the 79 kernel will automatically use the first serial line, /dev/ttyS0, as 80 system console. 81 82 You can set that using a kernel command line option such as 83 "console=uart8250,io,0x3f8,9600n8" 84 "console=uart8250,mmio,0xff5e0000,115200n8". 85 and it will switch to normal serial console when the corresponding 86 port is ready. 87 "earlycon=uart8250,io,0x3f8,9600n8" 88 "earlycon=uart8250,mmio,0xff5e0000,115200n8". 89 it will not only setup early console. 90 91 If unsure, say N. 92 93config FIX_EARLYCON_MEM 94 bool 95 depends on X86 96 default y 97 98config SERIAL_8250_GSC 99 tristate 100 depends on SERIAL_8250 && GSC 101 default SERIAL_8250 102 103config SERIAL_8250_DMA 104 bool "DMA support for 16550 compatible UART controllers" if EXPERT 105 depends on SERIAL_8250 && DMADEVICES=y 106 default SERIAL_8250 107 help 108 This builds DMA support that can be used with 8250/16650 109 compatible UART controllers that support DMA signaling. 110 111config SERIAL_8250_PCI 112 tristate "8250/16550 PCI device support" if EXPERT 113 depends on SERIAL_8250 && PCI 114 default SERIAL_8250 115 help 116 This builds standard PCI serial support. You may be able to 117 disable this feature if you only need legacy serial support. 118 Saves about 9K. 119 120config SERIAL_8250_HP300 121 tristate 122 depends on SERIAL_8250 && HP300 123 default SERIAL_8250 124 125config SERIAL_8250_CS 126 tristate "8250/16550 PCMCIA device support" 127 depends on PCMCIA && SERIAL_8250 128 ---help--- 129 Say Y here to enable support for 16-bit PCMCIA serial devices, 130 including serial port cards, modems, and the modem functions of 131 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 132 credit-card size devices often used with laptops.) 133 134 To compile this driver as a module, choose M here: the 135 module will be called serial_cs. 136 137 If unsure, say N. 138 139config SERIAL_8250_NR_UARTS 140 int "Maximum number of 8250/16550 serial ports" 141 depends on SERIAL_8250 142 default "4" 143 help 144 Set this to the number of serial ports you want the driver 145 to support. This includes any ports discovered via ACPI or 146 PCI enumeration and any ports that may be added at run-time 147 via hot-plug, or any ISA multi-port serial cards. 148 149config SERIAL_8250_RUNTIME_UARTS 150 int "Number of 8250/16550 serial ports to register at runtime" 151 depends on SERIAL_8250 152 range 0 SERIAL_8250_NR_UARTS 153 default "4" 154 help 155 Set this to the maximum number of serial ports you want 156 the kernel to register at boot time. This can be overridden 157 with the module parameter "nr_uarts", or boot-time parameter 158 8250.nr_uarts 159 160config SERIAL_8250_EXTENDED 161 bool "Extended 8250/16550 serial driver options" 162 depends on SERIAL_8250 163 help 164 If you wish to use any non-standard features of the standard "dumb" 165 driver, say Y here. This includes HUB6 support, shared serial 166 interrupts, special multiport support, support for more than the 167 four COM 1/2/3/4 boards, etc. 168 169 Note that the answer to this question won't directly affect the 170 kernel: saying N will just cause the configurator to skip all 171 the questions about serial driver options. If unsure, say N. 172 173config SERIAL_8250_MANY_PORTS 174 bool "Support more than 4 legacy serial ports" 175 depends on SERIAL_8250_EXTENDED && !IA64 176 help 177 Say Y here if you have dumb serial boards other than the four 178 standard COM 1/2/3/4 ports. This may happen if you have an AST 179 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 180 from <http://www.tldp.org/docs.html#howto>), or other custom 181 serial port hardware which acts similar to standard serial port 182 hardware. If you only use the standard COM 1/2/3/4 ports, you can 183 say N here to save some memory. You can also say Y if you have an 184 "intelligent" multiport card such as Cyclades, Digiboards, etc. 185 186# 187# Multi-port serial cards 188# 189 190config SERIAL_8250_FOURPORT 191 tristate "Support Fourport cards" 192 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 193 help 194 Say Y here if you have an AST FourPort serial board. 195 196 To compile this driver as a module, choose M here: the module 197 will be called 8250_fourport. 198 199config SERIAL_8250_ACCENT 200 tristate "Support Accent cards" 201 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 202 help 203 Say Y here if you have an Accent Async serial board. 204 205 To compile this driver as a module, choose M here: the module 206 will be called 8250_accent. 207 208config SERIAL_8250_BOCA 209 tristate "Support Boca cards" 210 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 211 help 212 Say Y here if you have a Boca serial board. Please read the Boca 213 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 214 215 To compile this driver as a module, choose M here: the module 216 will be called 8250_boca. 217 218config SERIAL_8250_EXAR_ST16C554 219 tristate "Support Exar ST16C554/554D Quad UART" 220 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 221 help 222 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 223 tinkering with your Envoy TU301, or have a machine with this UART, 224 say Y here. 225 226 To compile this driver as a module, choose M here: the module 227 will be called 8250_exar_st16c554. 228 229config SERIAL_8250_HUB6 230 tristate "Support Hub6 cards" 231 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 232 help 233 Say Y here if you have a HUB6 serial board. 234 235 To compile this driver as a module, choose M here: the module 236 will be called 8250_hub6. 237 238# 239# Misc. options/drivers. 240# 241 242config SERIAL_8250_SHARE_IRQ 243 bool "Support for sharing serial interrupts" 244 depends on SERIAL_8250_EXTENDED 245 help 246 Some serial boards have hardware support which allows multiple dumb 247 serial ports on the same board to share a single IRQ. To enable 248 support for this in the serial driver, say Y here. 249 250config SERIAL_8250_DETECT_IRQ 251 bool "Autodetect IRQ on standard ports (unsafe)" 252 depends on SERIAL_8250_EXTENDED 253 help 254 Say Y here if you want the kernel to try to guess which IRQ 255 to use for your serial port. 256 257 This is considered unsafe; it is far better to configure the IRQ in 258 a boot script using the setserial command. 259 260 If unsure, say N. 261 262config SERIAL_8250_RSA 263 bool "Support RSA serial ports" 264 depends on SERIAL_8250_EXTENDED 265 help 266 ::: To be written ::: 267 268config SERIAL_8250_ACORN 269 tristate "Acorn expansion card serial port support" 270 depends on ARCH_ACORN && SERIAL_8250 271 help 272 If you have an Atomwide Serial card or Serial Port card for an Acorn 273 system, say Y to this option. The driver can handle 1, 2, or 3 port 274 cards. If unsure, say N. 275 276config SERIAL_8250_FSL 277 bool 278 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 279 default PPC 280 281config SERIAL_8250_DW 282 tristate "Support for Synopsys DesignWare 8250 quirks" 283 depends on SERIAL_8250 284 help 285 Selecting this option will enable handling of the extra features 286 present in the Synopsys DesignWare APB UART. 287 288config SERIAL_8250_EM 289 tristate "Support for Emma Mobile integrated serial port" 290 depends on SERIAL_8250 && ARM && HAVE_CLK 291 help 292 Selecting this option will add support for the integrated serial 293 port hardware found on the Emma Mobile line of processors. 294 If unsure, say N. 295 296config SERIAL_8250_RT288X 297 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 298 depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883) 299 help 300 If you have a Ralink RT288x/RT305x SoC based board and want to use the 301 serial port, say Y to this option. The driver can handle up to 2 serial 302 ports. If unsure, say N. 303