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 ---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 Note that serial ports on NetMos 9835 Multi-I/O cards are handled 120 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL. 121 122config SERIAL_8250_HP300 123 tristate 124 depends on SERIAL_8250 && HP300 125 default SERIAL_8250 126 127config SERIAL_8250_CS 128 tristate "8250/16550 PCMCIA device support" 129 depends on PCMCIA && SERIAL_8250 130 ---help--- 131 Say Y here to enable support for 16-bit PCMCIA serial devices, 132 including serial port cards, modems, and the modem functions of 133 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 134 credit-card size devices often used with laptops.) 135 136 To compile this driver as a module, choose M here: the 137 module will be called serial_cs. 138 139 If unsure, say N. 140 141config SERIAL_8250_NR_UARTS 142 int "Maximum number of 8250/16550 serial ports" 143 depends on SERIAL_8250 144 default "4" 145 help 146 Set this to the number of serial ports you want the driver 147 to support. This includes any ports discovered via ACPI or 148 PCI enumeration and any ports that may be added at run-time 149 via hot-plug, or any ISA multi-port serial cards. 150 151config SERIAL_8250_RUNTIME_UARTS 152 int "Number of 8250/16550 serial ports to register at runtime" 153 depends on SERIAL_8250 154 range 0 SERIAL_8250_NR_UARTS 155 default "4" 156 help 157 Set this to the maximum number of serial ports you want 158 the kernel to register at boot time. This can be overridden 159 with the module parameter "nr_uarts", or boot-time parameter 160 8250.nr_uarts 161 162config SERIAL_8250_EXTENDED 163 bool "Extended 8250/16550 serial driver options" 164 depends on SERIAL_8250 165 help 166 If you wish to use any non-standard features of the standard "dumb" 167 driver, say Y here. This includes HUB6 support, shared serial 168 interrupts, special multiport support, support for more than the 169 four COM 1/2/3/4 boards, etc. 170 171 Note that the answer to this question won't directly affect the 172 kernel: saying N will just cause the configurator to skip all 173 the questions about serial driver options. If unsure, say N. 174 175config SERIAL_8250_MANY_PORTS 176 bool "Support more than 4 legacy serial ports" 177 depends on SERIAL_8250_EXTENDED && !IA64 178 help 179 Say Y here if you have dumb serial boards other than the four 180 standard COM 1/2/3/4 ports. This may happen if you have an AST 181 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 182 from <http://www.tldp.org/docs.html#howto>), or other custom 183 serial port hardware which acts similar to standard serial port 184 hardware. If you only use the standard COM 1/2/3/4 ports, you can 185 say N here to save some memory. You can also say Y if you have an 186 "intelligent" multiport card such as Cyclades, Digiboards, etc. 187 188# 189# Multi-port serial cards 190# 191 192config SERIAL_8250_FOURPORT 193 tristate "Support Fourport cards" 194 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 195 help 196 Say Y here if you have an AST FourPort serial board. 197 198 To compile this driver as a module, choose M here: the module 199 will be called 8250_fourport. 200 201config SERIAL_8250_ACCENT 202 tristate "Support Accent cards" 203 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 204 help 205 Say Y here if you have an Accent Async serial board. 206 207 To compile this driver as a module, choose M here: the module 208 will be called 8250_accent. 209 210config SERIAL_8250_BOCA 211 tristate "Support Boca cards" 212 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 213 help 214 Say Y here if you have a Boca serial board. Please read the Boca 215 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 216 217 To compile this driver as a module, choose M here: the module 218 will be called 8250_boca. 219 220config SERIAL_8250_EXAR_ST16C554 221 tristate "Support Exar ST16C554/554D Quad UART" 222 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 223 help 224 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 225 tinkering with your Envoy TU301, or have a machine with this UART, 226 say Y here. 227 228 To compile this driver as a module, choose M here: the module 229 will be called 8250_exar_st16c554. 230 231config SERIAL_8250_HUB6 232 tristate "Support Hub6 cards" 233 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 234 help 235 Say Y here if you have a HUB6 serial board. 236 237 To compile this driver as a module, choose M here: the module 238 will be called 8250_hub6. 239 240# 241# Misc. options/drivers. 242# 243 244config SERIAL_8250_SHARE_IRQ 245 bool "Support for sharing serial interrupts" 246 depends on SERIAL_8250_EXTENDED 247 help 248 Some serial boards have hardware support which allows multiple dumb 249 serial ports on the same board to share a single IRQ. To enable 250 support for this in the serial driver, say Y here. 251 252config SERIAL_8250_DETECT_IRQ 253 bool "Autodetect IRQ on standard ports (unsafe)" 254 depends on SERIAL_8250_EXTENDED 255 help 256 Say Y here if you want the kernel to try to guess which IRQ 257 to use for your serial port. 258 259 This is considered unsafe; it is far better to configure the IRQ in 260 a boot script using the setserial command. 261 262 If unsure, say N. 263 264config SERIAL_8250_RSA 265 bool "Support RSA serial ports" 266 depends on SERIAL_8250_EXTENDED 267 help 268 ::: To be written ::: 269 270config SERIAL_8250_ACORN 271 tristate "Acorn expansion card serial port support" 272 depends on ARCH_ACORN && SERIAL_8250 273 help 274 If you have an Atomwide Serial card or Serial Port card for an Acorn 275 system, say Y to this option. The driver can handle 1, 2, or 3 port 276 cards. If unsure, say N. 277 278config SERIAL_8250_FSL 279 bool 280 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 281 default PPC 282 283config SERIAL_8250_DW 284 tristate "Support for Synopsys DesignWare 8250 quirks" 285 depends on SERIAL_8250 286 help 287 Selecting this option will enable handling of the extra features 288 present in the Synopsys DesignWare APB UART. 289 290config SERIAL_8250_EM 291 tristate "Support for Emma Mobile integrated serial port" 292 depends on SERIAL_8250 && ARM && HAVE_CLK 293 help 294 Selecting this option will add support for the integrated serial 295 port hardware found on the Emma Mobile line of processors. 296 If unsure, say N. 297 298config SERIAL_8250_RT288X 299 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 300 depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883) 301 help 302 If you have a Ralink RT288x/RT305x SoC based board and want to use the 303 serial port, say Y to this option. The driver can handle up to 2 serial 304 ports. If unsure, say N. 305