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_FINTEK 61 bool "Support for Fintek F81216A LPC to 4 UART RS485 API" 62 depends on SERIAL_8250 63 ---help--- 64 Selecting this option will add support for the RS485 capabilities 65 of the Fintek F81216A LPC to 4 UART. 66 67 If this option is not selected the device will be configured as a 68 standard 16550A serial port. 69 70 If unsure, say N. 71 72config SERIAL_8250_CONSOLE 73 bool "Console on 8250/16550 and compatible serial port" 74 depends on SERIAL_8250=y 75 select SERIAL_CORE_CONSOLE 76 select SERIAL_EARLYCON 77 ---help--- 78 If you say Y here, it will be possible to use a serial port as the 79 system console (the system console is the device which receives all 80 kernel messages and warnings and which allows logins in single user 81 mode). This could be useful if some terminal or printer is connected 82 to that serial port. 83 84 Even if you say Y here, the currently visible virtual console 85 (/dev/tty0) will still be used as the system console by default, but 86 you can alter that using a kernel command line option such as 87 "console=ttyS1". (Try "man bootparam" or see the documentation of 88 your boot loader (grub or lilo or loadlin) about how to pass options 89 to the kernel at boot time.) 90 91 If you don't have a VGA card installed and you say Y here, the 92 kernel will automatically use the first serial line, /dev/ttyS0, as 93 system console. 94 95 You can set that using a kernel command line option such as 96 "console=uart8250,io,0x3f8,9600n8" 97 "console=uart8250,mmio,0xff5e0000,115200n8". 98 and it will switch to normal serial console when the corresponding 99 port is ready. 100 "earlycon=uart8250,io,0x3f8,9600n8" 101 "earlycon=uart8250,mmio,0xff5e0000,115200n8". 102 it will not only setup early console. 103 104 If unsure, say N. 105 106config SERIAL_8250_GSC 107 tristate 108 depends on SERIAL_8250 && GSC 109 default SERIAL_8250 110 111config SERIAL_8250_DMA 112 bool "DMA support for 16550 compatible UART controllers" if EXPERT 113 depends on SERIAL_8250 && DMADEVICES=y 114 default SERIAL_8250 115 help 116 This builds DMA support that can be used with 8250/16650 117 compatible UART controllers that support DMA signaling. 118 119config SERIAL_8250_PCI 120 tristate "8250/16550 PCI device support" if EXPERT 121 depends on SERIAL_8250 && PCI 122 default SERIAL_8250 123 select RATIONAL 124 help 125 This builds standard PCI serial support. You may be able to 126 disable this feature if you only need legacy serial support. 127 Saves about 9K. 128 Note that serial ports on NetMos 9835 Multi-I/O cards are handled 129 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL. 130 131config SERIAL_8250_HP300 132 tristate 133 depends on SERIAL_8250 && HP300 134 default SERIAL_8250 135 136config SERIAL_8250_CS 137 tristate "8250/16550 PCMCIA device support" 138 depends on PCMCIA && SERIAL_8250 139 ---help--- 140 Say Y here to enable support for 16-bit PCMCIA serial devices, 141 including serial port cards, modems, and the modem functions of 142 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 143 credit-card size devices often used with laptops.) 144 145 To compile this driver as a module, choose M here: the 146 module will be called serial_cs. 147 148 If unsure, say N. 149 150config SERIAL_8250_NR_UARTS 151 int "Maximum number of 8250/16550 serial ports" 152 depends on SERIAL_8250 153 default "4" 154 help 155 Set this to the number of serial ports you want the driver 156 to support. This includes any ports discovered via ACPI or 157 PCI enumeration and any ports that may be added at run-time 158 via hot-plug, or any ISA multi-port serial cards. 159 160config SERIAL_8250_RUNTIME_UARTS 161 int "Number of 8250/16550 serial ports to register at runtime" 162 depends on SERIAL_8250 163 range 0 SERIAL_8250_NR_UARTS 164 default "4" 165 help 166 Set this to the maximum number of serial ports you want 167 the kernel to register at boot time. This can be overridden 168 with the module parameter "nr_uarts", or boot-time parameter 169 8250.nr_uarts 170 171config SERIAL_8250_EXTENDED 172 bool "Extended 8250/16550 serial driver options" 173 depends on SERIAL_8250 174 help 175 If you wish to use any non-standard features of the standard "dumb" 176 driver, say Y here. This includes HUB6 support, shared serial 177 interrupts, special multiport support, support for more than the 178 four COM 1/2/3/4 boards, etc. 179 180 Note that the answer to this question won't directly affect the 181 kernel: saying N will just cause the configurator to skip all 182 the questions about serial driver options. If unsure, say N. 183 184config SERIAL_8250_MANY_PORTS 185 bool "Support more than 4 legacy serial ports" 186 depends on SERIAL_8250_EXTENDED && !IA64 187 help 188 Say Y here if you have dumb serial boards other than the four 189 standard COM 1/2/3/4 ports. This may happen if you have an AST 190 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 191 from <http://www.tldp.org/docs.html#howto>), or other custom 192 serial port hardware which acts similar to standard serial port 193 hardware. If you only use the standard COM 1/2/3/4 ports, you can 194 say N here to save some memory. You can also say Y if you have an 195 "intelligent" multiport card such as Cyclades, Digiboards, etc. 196 197# 198# Multi-port serial cards 199# 200 201config SERIAL_8250_FOURPORT 202 tristate "Support Fourport cards" 203 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 204 help 205 Say Y here if you have an AST FourPort serial board. 206 207 To compile this driver as a module, choose M here: the module 208 will be called 8250_fourport. 209 210config SERIAL_8250_ACCENT 211 tristate "Support Accent cards" 212 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 213 help 214 Say Y here if you have an Accent Async serial board. 215 216 To compile this driver as a module, choose M here: the module 217 will be called 8250_accent. 218 219config SERIAL_8250_BOCA 220 tristate "Support Boca cards" 221 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 222 help 223 Say Y here if you have a Boca serial board. Please read the Boca 224 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 225 226 To compile this driver as a module, choose M here: the module 227 will be called 8250_boca. 228 229config SERIAL_8250_EXAR_ST16C554 230 tristate "Support Exar ST16C554/554D Quad UART" 231 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 232 help 233 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 234 tinkering with your Envoy TU301, or have a machine with this UART, 235 say Y here. 236 237 To compile this driver as a module, choose M here: the module 238 will be called 8250_exar_st16c554. 239 240config SERIAL_8250_HUB6 241 tristate "Support Hub6 cards" 242 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 243 help 244 Say Y here if you have a HUB6 serial board. 245 246 To compile this driver as a module, choose M here: the module 247 will be called 8250_hub6. 248 249# 250# Misc. options/drivers. 251# 252 253config SERIAL_8250_SHARE_IRQ 254 bool "Support for sharing serial interrupts" 255 depends on SERIAL_8250_EXTENDED 256 help 257 Some serial boards have hardware support which allows multiple dumb 258 serial ports on the same board to share a single IRQ. To enable 259 support for this in the serial driver, say Y here. 260 261config SERIAL_8250_DETECT_IRQ 262 bool "Autodetect IRQ on standard ports (unsafe)" 263 depends on SERIAL_8250_EXTENDED 264 help 265 Say Y here if you want the kernel to try to guess which IRQ 266 to use for your serial port. 267 268 This is considered unsafe; it is far better to configure the IRQ in 269 a boot script using the setserial command. 270 271 If unsure, say N. 272 273config SERIAL_8250_RSA 274 bool "Support RSA serial ports" 275 depends on SERIAL_8250_EXTENDED 276 help 277 Say Y here if you have a IODATA RSA-DV II/S ISA card and 278 would like to use its >115kbps speeds. 279 You will need to provide module parameter "probe_rsa", or boot-time 280 parameter 8250.probe_rsa with I/O addresses of this card then. 281 282 If you don't have such card, or if unsure, say N. 283 284config SERIAL_8250_ACORN 285 tristate "Acorn expansion card serial port support" 286 depends on ARCH_ACORN && SERIAL_8250 287 help 288 If you have an Atomwide Serial card or Serial Port card for an Acorn 289 system, say Y to this option. The driver can handle 1, 2, or 3 port 290 cards. If unsure, say N. 291 292config SERIAL_8250_BCM2835AUX 293 tristate "BCM2835 auxiliar mini UART support" 294 depends on ARCH_BCM2835 || COMPILE_TEST 295 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 296 help 297 Support for the BCM2835 auxiliar mini UART. 298 299 Features and limitations of the UART are 300 Registers are similar to 16650 registers, 301 set bits in the control registers that are unsupported 302 are ignored and read back as 0 303 7/8 bit operation with 1 start and 1 stop bit 304 8 symbols deep fifo for rx and tx 305 SW controlled RTS and SW readable CTS 306 Clock rate derived from system clock 307 Uses 8 times oversampling (compared to 16 times for 16650) 308 Missing break detection (but break generation) 309 Missing framing error detection 310 Missing parity bit 311 Missing receive time-out interrupt 312 Missing DCD, DSR, DTR and RI signals 313 314 If unsure, say N. 315 316config SERIAL_8250_FSL 317 bool 318 depends on SERIAL_8250_CONSOLE 319 default PPC || ARM || ARM64 320 321config SERIAL_8250_DW 322 tristate "Support for Synopsys DesignWare 8250 quirks" 323 depends on SERIAL_8250 324 help 325 Selecting this option will enable handling of the extra features 326 present in the Synopsys DesignWare APB UART. 327 328config SERIAL_8250_EM 329 tristate "Support for Emma Mobile integrated serial port" 330 depends on SERIAL_8250 && ARM && HAVE_CLK 331 help 332 Selecting this option will add support for the integrated serial 333 port hardware found on the Emma Mobile line of processors. 334 If unsure, say N. 335 336config SERIAL_8250_RT288X 337 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 338 depends on SERIAL_8250 339 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 340 help 341 Selecting this option will add support for the alternate register 342 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 343 If unsure, say N. 344 345config SERIAL_8250_OMAP 346 tristate "Support for OMAP internal UART (8250 based driver)" 347 depends on SERIAL_8250 && ARCH_OMAP2PLUS 348 help 349 If you have a machine based on an Texas Instruments OMAP CPU you 350 can enable its onboard serial ports by enabling this option. 351 352 This driver uses ttyS instead of ttyO. 353 354config SERIAL_8250_OMAP_TTYO_FIXUP 355 bool "Replace ttyO with ttyS" 356 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 357 default y 358 help 359 This option replaces the "console=ttyO" argument with the matching 360 ttyS argument if the user did not specified it on the command line. 361 This ensures that the user can see the kernel output during boot 362 which he wouldn't see otherwise. The getty has still to be configured 363 for ttyS instead of ttyO regardless of this option. 364 This option is intended for people who "automatically" enable this 365 driver without knowing that this driver requires a different console= 366 argument. If you read this, please keep this option disabled and 367 instead update your kernel command line. If you prepare a kernel for a 368 distribution or other kind of larger user base then you probably want 369 to keep this option enabled. Otherwise people might complain about a 370 not booting kernel because the serial console remains silent in case 371 they forgot to update the command line. 372 373config SERIAL_8250_LPC18XX 374 tristate "NXP LPC18xx/43xx serial port support" 375 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 376 default ARCH_LPC18XX 377 help 378 If you have a LPC18xx/43xx based board and want to use the 379 serial port, say Y to this option. If unsure, say Y. 380 381config SERIAL_8250_MT6577 382 tristate "Mediatek serial port support" 383 depends on SERIAL_8250 && ARCH_MEDIATEK 384 help 385 If you have a Mediatek based board and want to use the 386 serial port, say Y to this option. If unsure, say N. 387 388config SERIAL_8250_UNIPHIER 389 tristate "Support for UniPhier on-chip UART" 390 depends on SERIAL_8250 391 depends on ARCH_UNIPHIER || COMPILE_TEST 392 help 393 If you have a UniPhier based board and want to use the on-chip 394 serial ports, say Y to this option. If unsure, say N. 395 396config SERIAL_8250_INGENIC 397 tristate "Support for Ingenic SoC serial ports" 398 depends on SERIAL_8250 399 depends on OF_FLATTREE 400 depends on MIPS || COMPILE_TEST 401 help 402 If you have a system using an Ingenic SoC and wish to make use of 403 its UARTs, say Y to this option. If unsure, say N. 404 405config SERIAL_8250_MID 406 tristate "Support for serial ports on Intel MID platforms" if EXPERT 407 default SERIAL_8250 408 depends on SERIAL_8250 && PCI 409 depends on X86 || COMPILE_TEST 410 select HSU_DMA if SERIAL_8250_DMA 411 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 412 select RATIONAL 413 help 414 Selecting this option will enable handling of the extra features 415 present on the UART found on Intel Medfield SOC and various other 416 Intel platforms. 417 418config SERIAL_8250_MOXA 419 tristate "MOXA SmartIO MUE support" 420 depends on SERIAL_8250 && PCI 421 help 422 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 423 If unsure, say N. 424 425 This driver can also be built as a module. The module will be called 426 8250_moxa. If you want to do that, say M here. 427 428config SERIAL_OF_PLATFORM 429 tristate "Devicetree based probing for 8250 ports" 430 depends on SERIAL_8250 && OF 431 help 432 This option is used for all 8250 compatible serial ports that 433 are probed through devicetree, including Open Firmware based 434 PowerPC systems and embedded systems on architectures using the 435 flattened device tree format. 436