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" 121 depends on SERIAL_8250 && PCI 122 default SERIAL_8250 123 help 124 This builds standard PCI serial support. You may be able to 125 disable this feature if you only need legacy serial support. 126 Saves about 9K. 127 Note that serial ports on NetMos 9835 Multi-I/O cards are handled 128 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL. 129 130config SERIAL_8250_EXAR 131 tristate "8250/16550 PCI device support" 132 depends on SERIAL_8250_PCI 133 default SERIAL_8250 134 135config SERIAL_8250_HP300 136 tristate 137 depends on SERIAL_8250 && HP300 138 default SERIAL_8250 139 140config SERIAL_8250_CS 141 tristate "8250/16550 PCMCIA device support" 142 depends on PCMCIA && SERIAL_8250 143 ---help--- 144 Say Y here to enable support for 16-bit PCMCIA serial devices, 145 including serial port cards, modems, and the modem functions of 146 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 147 credit-card size devices often used with laptops.) 148 149 To compile this driver as a module, choose M here: the 150 module will be called serial_cs. 151 152 If unsure, say N. 153 154config SERIAL_8250_NR_UARTS 155 int "Maximum number of 8250/16550 serial ports" 156 depends on SERIAL_8250 157 default "4" 158 help 159 Set this to the number of serial ports you want the driver 160 to support. This includes any ports discovered via ACPI or 161 PCI enumeration and any ports that may be added at run-time 162 via hot-plug, or any ISA multi-port serial cards. 163 164config SERIAL_8250_RUNTIME_UARTS 165 int "Number of 8250/16550 serial ports to register at runtime" 166 depends on SERIAL_8250 167 range 0 SERIAL_8250_NR_UARTS 168 default "4" 169 help 170 Set this to the maximum number of serial ports you want 171 the kernel to register at boot time. This can be overridden 172 with the module parameter "nr_uarts", or boot-time parameter 173 8250.nr_uarts 174 175config SERIAL_8250_EXTENDED 176 bool "Extended 8250/16550 serial driver options" 177 depends on SERIAL_8250 178 help 179 If you wish to use any non-standard features of the standard "dumb" 180 driver, say Y here. This includes HUB6 support, shared serial 181 interrupts, special multiport support, support for more than the 182 four COM 1/2/3/4 boards, etc. 183 184 Note that the answer to this question won't directly affect the 185 kernel: saying N will just cause the configurator to skip all 186 the questions about serial driver options. If unsure, say N. 187 188config SERIAL_8250_MANY_PORTS 189 bool "Support more than 4 legacy serial ports" 190 depends on SERIAL_8250_EXTENDED && !IA64 191 help 192 Say Y here if you have dumb serial boards other than the four 193 standard COM 1/2/3/4 ports. This may happen if you have an AST 194 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 195 from <http://www.tldp.org/docs.html#howto>), or other custom 196 serial port hardware which acts similar to standard serial port 197 hardware. If you only use the standard COM 1/2/3/4 ports, you can 198 say N here to save some memory. You can also say Y if you have an 199 "intelligent" multiport card such as Cyclades, Digiboards, etc. 200 201# 202# Multi-port serial cards 203# 204 205config SERIAL_8250_FOURPORT 206 tristate "Support Fourport cards" 207 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 208 help 209 Say Y here if you have an AST FourPort serial board. 210 211 To compile this driver as a module, choose M here: the module 212 will be called 8250_fourport. 213 214config SERIAL_8250_ACCENT 215 tristate "Support Accent cards" 216 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 217 help 218 Say Y here if you have an Accent Async serial board. 219 220 To compile this driver as a module, choose M here: the module 221 will be called 8250_accent. 222 223config SERIAL_8250_BOCA 224 tristate "Support Boca cards" 225 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 226 help 227 Say Y here if you have a Boca serial board. Please read the Boca 228 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 229 230 To compile this driver as a module, choose M here: the module 231 will be called 8250_boca. 232 233config SERIAL_8250_EXAR_ST16C554 234 tristate "Support Exar ST16C554/554D Quad UART" 235 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 236 help 237 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 238 tinkering with your Envoy TU301, or have a machine with this UART, 239 say Y here. 240 241 To compile this driver as a module, choose M here: the module 242 will be called 8250_exar_st16c554. 243 244config SERIAL_8250_HUB6 245 tristate "Support Hub6 cards" 246 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 247 help 248 Say Y here if you have a HUB6 serial board. 249 250 To compile this driver as a module, choose M here: the module 251 will be called 8250_hub6. 252 253# 254# Misc. options/drivers. 255# 256 257config SERIAL_8250_SHARE_IRQ 258 bool "Support for sharing serial interrupts" 259 depends on SERIAL_8250_EXTENDED 260 help 261 Some serial boards have hardware support which allows multiple dumb 262 serial ports on the same board to share a single IRQ. To enable 263 support for this in the serial driver, say Y here. 264 265config SERIAL_8250_DETECT_IRQ 266 bool "Autodetect IRQ on standard ports (unsafe)" 267 depends on SERIAL_8250_EXTENDED 268 help 269 Say Y here if you want the kernel to try to guess which IRQ 270 to use for your serial port. 271 272 This is considered unsafe; it is far better to configure the IRQ in 273 a boot script using the setserial command. 274 275 If unsure, say N. 276 277config SERIAL_8250_RSA 278 bool "Support RSA serial ports" 279 depends on SERIAL_8250_EXTENDED 280 help 281 Say Y here if you have a IODATA RSA-DV II/S ISA card and 282 would like to use its >115kbps speeds. 283 You will need to provide module parameter "probe_rsa", or boot-time 284 parameter 8250.probe_rsa with I/O addresses of this card then. 285 286 If you don't have such card, or if unsure, say N. 287 288config SERIAL_8250_ACORN 289 tristate "Acorn expansion card serial port support" 290 depends on ARCH_ACORN && SERIAL_8250 291 help 292 If you have an Atomwide Serial card or Serial Port card for an Acorn 293 system, say Y to this option. The driver can handle 1, 2, or 3 port 294 cards. If unsure, say N. 295 296config SERIAL_8250_BCM2835AUX 297 tristate "BCM2835 auxiliar mini UART support" 298 depends on ARCH_BCM2835 || COMPILE_TEST 299 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 300 help 301 Support for the BCM2835 auxiliar mini UART. 302 303 Features and limitations of the UART are 304 Registers are similar to 16650 registers, 305 set bits in the control registers that are unsupported 306 are ignored and read back as 0 307 7/8 bit operation with 1 start and 1 stop bit 308 8 symbols deep fifo for rx and tx 309 SW controlled RTS and SW readable CTS 310 Clock rate derived from system clock 311 Uses 8 times oversampling (compared to 16 times for 16650) 312 Missing break detection (but break generation) 313 Missing framing error detection 314 Missing parity bit 315 Missing receive time-out interrupt 316 Missing DCD, DSR, DTR and RI signals 317 318 If unsure, say N. 319 320config SERIAL_8250_FSL 321 bool 322 depends on SERIAL_8250_CONSOLE 323 default PPC || ARM || ARM64 324 325config SERIAL_8250_DW 326 tristate "Support for Synopsys DesignWare 8250 quirks" 327 depends on SERIAL_8250 328 help 329 Selecting this option will enable handling of the extra features 330 present in the Synopsys DesignWare APB UART. 331 332config SERIAL_8250_EM 333 tristate "Support for Emma Mobile integrated serial port" 334 depends on SERIAL_8250 && ARM && HAVE_CLK 335 help 336 Selecting this option will add support for the integrated serial 337 port hardware found on the Emma Mobile line of processors. 338 If unsure, say N. 339 340config SERIAL_8250_RT288X 341 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 342 depends on SERIAL_8250 343 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 344 help 345 Selecting this option will add support for the alternate register 346 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 347 If unsure, say N. 348 349config SERIAL_8250_OMAP 350 tristate "Support for OMAP internal UART (8250 based driver)" 351 depends on SERIAL_8250 && ARCH_OMAP2PLUS 352 help 353 If you have a machine based on an Texas Instruments OMAP CPU you 354 can enable its onboard serial ports by enabling this option. 355 356 This driver uses ttyS instead of ttyO. 357 358config SERIAL_8250_OMAP_TTYO_FIXUP 359 bool "Replace ttyO with ttyS" 360 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 361 default y 362 help 363 This option replaces the "console=ttyO" argument with the matching 364 ttyS argument if the user did not specified it on the command line. 365 This ensures that the user can see the kernel output during boot 366 which he wouldn't see otherwise. The getty has still to be configured 367 for ttyS instead of ttyO regardless of this option. 368 This option is intended for people who "automatically" enable this 369 driver without knowing that this driver requires a different console= 370 argument. If you read this, please keep this option disabled and 371 instead update your kernel command line. If you prepare a kernel for a 372 distribution or other kind of larger user base then you probably want 373 to keep this option enabled. Otherwise people might complain about a 374 not booting kernel because the serial console remains silent in case 375 they forgot to update the command line. 376 377config SERIAL_8250_LPC18XX 378 tristate "NXP LPC18xx/43xx serial port support" 379 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 380 default ARCH_LPC18XX 381 help 382 If you have a LPC18xx/43xx based board and want to use the 383 serial port, say Y to this option. If unsure, say Y. 384 385config SERIAL_8250_MT6577 386 tristate "Mediatek serial port support" 387 depends on SERIAL_8250 && ARCH_MEDIATEK 388 help 389 If you have a Mediatek based board and want to use the 390 serial port, say Y to this option. If unsure, say N. 391 392config SERIAL_8250_UNIPHIER 393 tristate "Support for UniPhier on-chip UART" 394 depends on SERIAL_8250 395 depends on ARCH_UNIPHIER || COMPILE_TEST 396 help 397 If you have a UniPhier based board and want to use the on-chip 398 serial ports, say Y to this option. If unsure, say N. 399 400config SERIAL_8250_INGENIC 401 tristate "Support for Ingenic SoC serial ports" 402 depends on SERIAL_8250 403 depends on OF_FLATTREE 404 depends on MIPS || COMPILE_TEST 405 help 406 If you have a system using an Ingenic SoC and wish to make use of 407 its UARTs, say Y to this option. If unsure, say N. 408 409config SERIAL_8250_LPSS 410 tristate "Support for serial ports on Intel LPSS platforms" 411 default SERIAL_8250 412 depends on SERIAL_8250 && PCI 413 depends on X86 || COMPILE_TEST 414 select DW_DMAC_CORE if SERIAL_8250_DMA 415 select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS) 416 select RATIONAL 417 help 418 Selecting this option will enable handling of the extra features 419 present on the UART found on various Intel platforms such as: 420 - Intel Baytrail SoC 421 - Intel Braswell SoC 422 - Intel Quark X1000 SoC 423 424config SERIAL_8250_MID 425 tristate "Support for serial ports on Intel MID platforms" 426 default SERIAL_8250 427 depends on SERIAL_8250 && PCI 428 depends on X86 || COMPILE_TEST 429 select HSU_DMA if SERIAL_8250_DMA 430 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 431 select RATIONAL 432 help 433 Selecting this option will enable handling of the extra features 434 present on the UART found on Intel Medfield SOC and various other 435 Intel platforms. 436 437config SERIAL_8250_MOXA 438 tristate "MOXA SmartIO MUE support" 439 depends on SERIAL_8250 && PCI 440 help 441 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 442 If unsure, say N. 443 444 This driver can also be built as a module. The module will be called 445 8250_moxa. If you want to do that, say M here. 446 447config SERIAL_8250_PXA 448 tristate "PXA serial port support" 449 depends on SERIAL_8250 450 depends on ARCH_PXA || ARCH_MMP 451 help 452 If you have a machine based on an Intel XScale PXA2xx CPU you can 453 enable its onboard serial ports by enabling this option. The option is 454 applicable to both devicetree and legacy boards, and early console is 455 part of its support. 456 457config SERIAL_OF_PLATFORM 458 tristate "Devicetree based probing for 8250 ports" 459 depends on SERIAL_8250 && OF 460 help 461 This option is used for all 8250 compatible serial ports that 462 are probed through devicetree, including Open Firmware based 463 PowerPC systems and embedded systems on architectures using the 464 flattened device tree format. 465