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_DEPRECATED_OPTIONS 37 bool "Support 8250_core.* kernel options (DEPRECATED)" 38 depends on SERIAL_8250 39 default y 40 ---help--- 41 In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to 42 accept kernel parameters in both forms like 8250_core.nr_uarts=4 and 43 8250.nr_uarts=4. We now renamed the module back to 8250, but if 44 anybody noticed in 3.7 and changed their userspace we still have to 45 keep the 8350_core.* options around until they revert the changes 46 they already did. 47 48 If 8250 is built as a module, this adds 8250_core alias instead. 49 50 If you did not notice yet and/or you have userspace from pre-3.7, it 51 is safe (and recommended) to say N here. 52 53config SERIAL_8250_PNP 54 bool "8250/16550 PNP device support" if EXPERT 55 depends on SERIAL_8250 && PNP 56 default y 57 ---help--- 58 This builds standard PNP serial support. You may be able to 59 disable this feature if you only need legacy serial support. 60 61config SERIAL_8250_CONSOLE 62 bool "Console on 8250/16550 and compatible serial port" 63 depends on SERIAL_8250=y 64 select SERIAL_CORE_CONSOLE 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 FIX_EARLYCON_MEM 95 bool 96 depends on X86 97 default y 98 99config SERIAL_8250_GSC 100 tristate 101 depends on SERIAL_8250 && GSC 102 default SERIAL_8250 103 104config SERIAL_8250_DMA 105 bool "DMA support for 16550 compatible UART controllers" if EXPERT 106 depends on SERIAL_8250 && DMADEVICES=y 107 default SERIAL_8250 108 help 109 This builds DMA support that can be used with 8250/16650 110 compatible UART controllers that support DMA signaling. 111 112config SERIAL_8250_PCI 113 tristate "8250/16550 PCI device support" if EXPERT 114 depends on SERIAL_8250 && PCI 115 default SERIAL_8250 116 help 117 This builds standard PCI serial support. You may be able to 118 disable this feature if you only need legacy serial support. 119 Saves about 9K. 120 121config SERIAL_8250_HP300 122 tristate 123 depends on SERIAL_8250 && HP300 124 default SERIAL_8250 125 126config SERIAL_8250_CS 127 tristate "8250/16550 PCMCIA device support" 128 depends on PCMCIA && SERIAL_8250 129 ---help--- 130 Say Y here to enable support for 16-bit PCMCIA serial devices, 131 including serial port cards, modems, and the modem functions of 132 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 133 credit-card size devices often used with laptops.) 134 135 To compile this driver as a module, choose M here: the 136 module will be called serial_cs. 137 138 If unsure, say N. 139 140config SERIAL_8250_NR_UARTS 141 int "Maximum number of 8250/16550 serial ports" 142 depends on SERIAL_8250 143 default "4" 144 help 145 Set this to the number of serial ports you want the driver 146 to support. This includes any ports discovered via ACPI or 147 PCI enumeration and any ports that may be added at run-time 148 via hot-plug, or any ISA multi-port serial cards. 149 150config SERIAL_8250_RUNTIME_UARTS 151 int "Number of 8250/16550 serial ports to register at runtime" 152 depends on SERIAL_8250 153 range 0 SERIAL_8250_NR_UARTS 154 default "4" 155 help 156 Set this to the maximum number of serial ports you want 157 the kernel to register at boot time. This can be overridden 158 with the module parameter "nr_uarts", or boot-time parameter 159 8250.nr_uarts 160 161config SERIAL_8250_EXTENDED 162 bool "Extended 8250/16550 serial driver options" 163 depends on SERIAL_8250 164 help 165 If you wish to use any non-standard features of the standard "dumb" 166 driver, say Y here. This includes HUB6 support, shared serial 167 interrupts, special multiport support, support for more than the 168 four COM 1/2/3/4 boards, etc. 169 170 Note that the answer to this question won't directly affect the 171 kernel: saying N will just cause the configurator to skip all 172 the questions about serial driver options. If unsure, say N. 173 174config SERIAL_8250_MANY_PORTS 175 bool "Support more than 4 legacy serial ports" 176 depends on SERIAL_8250_EXTENDED && !IA64 177 help 178 Say Y here if you have dumb serial boards other than the four 179 standard COM 1/2/3/4 ports. This may happen if you have an AST 180 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 181 from <http://www.tldp.org/docs.html#howto>), or other custom 182 serial port hardware which acts similar to standard serial port 183 hardware. If you only use the standard COM 1/2/3/4 ports, you can 184 say N here to save some memory. You can also say Y if you have an 185 "intelligent" multiport card such as Cyclades, Digiboards, etc. 186 187# 188# Multi-port serial cards 189# 190 191config SERIAL_8250_FOURPORT 192 tristate "Support Fourport cards" 193 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 194 help 195 Say Y here if you have an AST FourPort serial board. 196 197 To compile this driver as a module, choose M here: the module 198 will be called 8250_fourport. 199 200config SERIAL_8250_ACCENT 201 tristate "Support Accent cards" 202 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 203 help 204 Say Y here if you have an Accent Async serial board. 205 206 To compile this driver as a module, choose M here: the module 207 will be called 8250_accent. 208 209config SERIAL_8250_BOCA 210 tristate "Support Boca cards" 211 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 212 help 213 Say Y here if you have a Boca serial board. Please read the Boca 214 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 215 216 To compile this driver as a module, choose M here: the module 217 will be called 8250_boca. 218 219config SERIAL_8250_EXAR_ST16C554 220 tristate "Support Exar ST16C554/554D Quad UART" 221 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 222 help 223 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 224 tinkering with your Envoy TU301, or have a machine with this UART, 225 say Y here. 226 227 To compile this driver as a module, choose M here: the module 228 will be called 8250_exar_st16c554. 229 230config SERIAL_8250_HUB6 231 tristate "Support Hub6 cards" 232 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 233 help 234 Say Y here if you have a HUB6 serial board. 235 236 To compile this driver as a module, choose M here: the module 237 will be called 8250_hub6. 238 239# 240# Misc. options/drivers. 241# 242 243config SERIAL_8250_SHARE_IRQ 244 bool "Support for sharing serial interrupts" 245 depends on SERIAL_8250_EXTENDED 246 help 247 Some serial boards have hardware support which allows multiple dumb 248 serial ports on the same board to share a single IRQ. To enable 249 support for this in the serial driver, say Y here. 250 251config SERIAL_8250_DETECT_IRQ 252 bool "Autodetect IRQ on standard ports (unsafe)" 253 depends on SERIAL_8250_EXTENDED 254 help 255 Say Y here if you want the kernel to try to guess which IRQ 256 to use for your serial port. 257 258 This is considered unsafe; it is far better to configure the IRQ in 259 a boot script using the setserial command. 260 261 If unsure, say N. 262 263config SERIAL_8250_RSA 264 bool "Support RSA serial ports" 265 depends on SERIAL_8250_EXTENDED 266 help 267 ::: To be written ::: 268 269config SERIAL_8250_ACORN 270 tristate "Acorn expansion card serial port support" 271 depends on ARCH_ACORN && SERIAL_8250 272 help 273 If you have an Atomwide Serial card or Serial Port card for an Acorn 274 system, say Y to this option. The driver can handle 1, 2, or 3 port 275 cards. If unsure, say N. 276 277config SERIAL_8250_FSL 278 bool 279 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 280 default PPC 281 282config SERIAL_8250_DW 283 tristate "Support for Synopsys DesignWare 8250 quirks" 284 depends on SERIAL_8250 285 help 286 Selecting this option will enable handling of the extra features 287 present in the Synopsys DesignWare APB UART. 288 289config SERIAL_8250_EM 290 tristate "Support for Emma Mobile integrated serial port" 291 depends on SERIAL_8250 && ARM && HAVE_CLK 292 help 293 Selecting this option will add support for the integrated serial 294 port hardware found on the Emma Mobile line of processors. 295 If unsure, say N. 296 297config SERIAL_8250_RT288X 298 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 299 depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883) 300 help 301 If you have a Ralink RT288x/RT305x SoC based board and want to use the 302 serial port, say Y to this option. The driver can handle up to 2 serial 303 ports. If unsure, say N. 304