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 depends on !S390 9 select SERIAL_CORE 10 ---help--- 11 This selects whether you want to include the driver for the standard 12 serial ports. The standard answer is Y. People who might say N 13 here are those that are setting up dedicated Ethernet WWW/FTP 14 servers, or users that have one of the various bus mice instead of a 15 serial mouse and don't intend to use their machine's standard serial 16 port for anything. (Note that the Cyclades multi serial port driver 17 does not need this driver built in for it to 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 8250_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_FINTEK 62 bool "Support for Fintek F81216A LPC to 4 UART RS485 API" 63 depends on SERIAL_8250 64 ---help--- 65 Selecting this option will add support for the RS485 capabilities 66 of the Fintek F81216A LPC to 4 UART. 67 68 If this option is not selected the device will be configured as a 69 standard 16550A serial port. 70 71 If unsure, say N. 72 73config SERIAL_8250_CONSOLE 74 bool "Console on 8250/16550 and compatible serial port" 75 depends on SERIAL_8250=y 76 select SERIAL_CORE_CONSOLE 77 select SERIAL_EARLYCON 78 ---help--- 79 If you say Y here, it will be possible to use a serial port as the 80 system console (the system console is the device which receives all 81 kernel messages and warnings and which allows logins in single user 82 mode). This could be useful if some terminal or printer is connected 83 to that serial port. 84 85 Even if you say Y here, the currently visible virtual console 86 (/dev/tty0) will still be used as the system console by default, but 87 you can alter that using a kernel command line option such as 88 "console=ttyS1". (Try "man bootparam" or see the documentation of 89 your boot loader (grub or lilo or loadlin) about how to pass options 90 to the kernel at boot time.) 91 92 If you don't have a VGA card installed and you say Y here, the 93 kernel will automatically use the first serial line, /dev/ttyS0, as 94 system console. 95 96 You can set that using a kernel command line option such as 97 "console=uart8250,io,0x3f8,9600n8" 98 "console=uart8250,mmio,0xff5e0000,115200n8". 99 and it will switch to normal serial console when the corresponding 100 port is ready. 101 "earlycon=uart8250,io,0x3f8,9600n8" 102 "earlycon=uart8250,mmio,0xff5e0000,115200n8". 103 it will not only setup early console. 104 105 If unsure, say N. 106 107config SERIAL_8250_GSC 108 tristate 109 depends on SERIAL_8250 && GSC 110 default SERIAL_8250 111 112config SERIAL_8250_DMA 113 bool "DMA support for 16550 compatible UART controllers" if EXPERT 114 depends on SERIAL_8250 && DMADEVICES=y 115 default SERIAL_8250 116 help 117 This builds DMA support that can be used with 8250/16650 118 compatible UART controllers that support DMA signaling. 119 120config SERIAL_8250_PCI 121 tristate "8250/16550 PCI device support" 122 depends on SERIAL_8250 && PCI 123 default SERIAL_8250 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_EXAR 132 tristate "8250/16550 Exar/Commtech PCI/PCIe device support" 133 depends on SERIAL_8250_PCI 134 default SERIAL_8250 135 help 136 This builds support for XR17C1xx, XR17V3xx and some Commtech 137 422x PCIe serial cards that are not covered by the more generic 138 SERIAL_8250_PCI option. 139 140config SERIAL_8250_HP300 141 tristate 142 depends on SERIAL_8250 && HP300 143 default SERIAL_8250 144 145config SERIAL_8250_CS 146 tristate "8250/16550 PCMCIA device support" 147 depends on PCMCIA && SERIAL_8250 148 ---help--- 149 Say Y here to enable support for 16-bit PCMCIA serial devices, 150 including serial port cards, modems, and the modem functions of 151 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 152 credit-card size devices often used with laptops.) 153 154 To compile this driver as a module, choose M here: the 155 module will be called serial_cs. 156 157 If unsure, say N. 158 159config SERIAL_8250_MEN_MCB 160 tristate "MEN MCB UART device support" 161 depends on MCB && SERIAL_8250 162 help 163 This enables support for FPGA based UARTs found on many MEN 164 boards. This driver enables support for the 16z025, 16z057 165 and 16z125 UARTs. 166 167 To compile this driver as a module, chose M here: the 168 module will be called 8250_men_mcb. 169 170 171config SERIAL_8250_NR_UARTS 172 int "Maximum number of 8250/16550 serial ports" 173 depends on SERIAL_8250 174 default "4" 175 help 176 Set this to the number of serial ports you want the driver 177 to support. This includes any ports discovered via ACPI or 178 PCI enumeration and any ports that may be added at run-time 179 via hot-plug, or any ISA multi-port serial cards. 180 181config SERIAL_8250_RUNTIME_UARTS 182 int "Number of 8250/16550 serial ports to register at runtime" 183 depends on SERIAL_8250 184 range 0 SERIAL_8250_NR_UARTS 185 default "4" 186 help 187 Set this to the maximum number of serial ports you want 188 the kernel to register at boot time. This can be overridden 189 with the module parameter "nr_uarts", or boot-time parameter 190 8250.nr_uarts 191 192config SERIAL_8250_EXTENDED 193 bool "Extended 8250/16550 serial driver options" 194 depends on SERIAL_8250 195 help 196 If you wish to use any non-standard features of the standard "dumb" 197 driver, say Y here. This includes HUB6 support, shared serial 198 interrupts, special multiport support, support for more than the 199 four COM 1/2/3/4 boards, etc. 200 201 Note that the answer to this question won't directly affect the 202 kernel: saying N will just cause the configurator to skip all 203 the questions about serial driver options. If unsure, say N. 204 205config SERIAL_8250_MANY_PORTS 206 bool "Support more than 4 legacy serial ports" 207 depends on SERIAL_8250_EXTENDED && !IA64 208 help 209 Say Y here if you have dumb serial boards other than the four 210 standard COM 1/2/3/4 ports. This may happen if you have an AST 211 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 212 from <http://www.tldp.org/docs.html#howto>), or other custom 213 serial port hardware which acts similar to standard serial port 214 hardware. If you only use the standard COM 1/2/3/4 ports, you can 215 say N here to save some memory. You can also say Y if you have an 216 "intelligent" multiport card such as Cyclades, Digiboards, etc. 217 218# 219# Multi-port serial cards 220# 221 222config SERIAL_8250_FOURPORT 223 tristate "Support Fourport cards" 224 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 225 help 226 Say Y here if you have an AST FourPort serial board. 227 228 To compile this driver as a module, choose M here: the module 229 will be called 8250_fourport. 230 231config SERIAL_8250_ACCENT 232 tristate "Support Accent cards" 233 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 234 help 235 Say Y here if you have an Accent Async serial board. 236 237 To compile this driver as a module, choose M here: the module 238 will be called 8250_accent. 239 240config SERIAL_8250_ASPEED_VUART 241 tristate "Aspeed Virtual UART" 242 depends on SERIAL_8250 243 depends on OF 244 help 245 If you want to use the virtual UART (VUART) device on Aspeed 246 BMC platforms, enable this option. This enables the 16550A- 247 compatible device on the local LPC bus, giving a UART device 248 with no physical RS232 connections. 249 250config SERIAL_8250_BOCA 251 tristate "Support Boca cards" 252 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 253 help 254 Say Y here if you have a Boca serial board. Please read the Boca 255 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 256 257 To compile this driver as a module, choose M here: the module 258 will be called 8250_boca. 259 260config SERIAL_8250_EXAR_ST16C554 261 tristate "Support Exar ST16C554/554D Quad UART" 262 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 263 help 264 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 265 tinkering with your Envoy TU301, or have a machine with this UART, 266 say Y here. 267 268 To compile this driver as a module, choose M here: the module 269 will be called 8250_exar_st16c554. 270 271config SERIAL_8250_HUB6 272 tristate "Support Hub6 cards" 273 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 274 help 275 Say Y here if you have a HUB6 serial board. 276 277 To compile this driver as a module, choose M here: the module 278 will be called 8250_hub6. 279 280# 281# Misc. options/drivers. 282# 283 284config SERIAL_8250_SHARE_IRQ 285 bool "Support for sharing serial interrupts" 286 depends on SERIAL_8250_EXTENDED 287 help 288 Some serial boards have hardware support which allows multiple dumb 289 serial ports on the same board to share a single IRQ. To enable 290 support for this in the serial driver, say Y here. 291 292config SERIAL_8250_DETECT_IRQ 293 bool "Autodetect IRQ on standard ports (unsafe)" 294 depends on SERIAL_8250_EXTENDED 295 help 296 Say Y here if you want the kernel to try to guess which IRQ 297 to use for your serial port. 298 299 This is considered unsafe; it is far better to configure the IRQ in 300 a boot script using the setserial command. 301 302 If unsure, say N. 303 304config SERIAL_8250_RSA 305 bool "Support RSA serial ports" 306 depends on SERIAL_8250_EXTENDED 307 help 308 Say Y here if you have a IODATA RSA-DV II/S ISA card and 309 would like to use its >115kbps speeds. 310 You will need to provide module parameter "probe_rsa", or boot-time 311 parameter 8250.probe_rsa with I/O addresses of this card then. 312 313 If you don't have such card, or if unsure, say N. 314 315config SERIAL_8250_ACORN 316 tristate "Acorn expansion card serial port support" 317 depends on ARCH_ACORN && SERIAL_8250 318 help 319 If you have an Atomwide Serial card or Serial Port card for an Acorn 320 system, say Y to this option. The driver can handle 1, 2, or 3 port 321 cards. If unsure, say N. 322 323config SERIAL_8250_BCM2835AUX 324 tristate "BCM2835 auxiliar mini UART support" 325 depends on ARCH_BCM2835 || COMPILE_TEST 326 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 327 help 328 Support for the BCM2835 auxiliar mini UART. 329 330 Features and limitations of the UART are 331 Registers are similar to 16650 registers, 332 set bits in the control registers that are unsupported 333 are ignored and read back as 0 334 7/8 bit operation with 1 start and 1 stop bit 335 8 symbols deep fifo for rx and tx 336 SW controlled RTS and SW readable CTS 337 Clock rate derived from system clock 338 Uses 8 times oversampling (compared to 16 times for 16650) 339 Missing break detection (but break generation) 340 Missing framing error detection 341 Missing parity bit 342 Missing receive time-out interrupt 343 Missing DCD, DSR, DTR and RI signals 344 345 If unsure, say N. 346 347config SERIAL_8250_FSL 348 bool 349 depends on SERIAL_8250_CONSOLE 350 default PPC || ARM || ARM64 351 352config SERIAL_8250_DW 353 tristate "Support for Synopsys DesignWare 8250 quirks" 354 depends on SERIAL_8250 355 help 356 Selecting this option will enable handling of the extra features 357 present in the Synopsys DesignWare APB UART. 358 359config SERIAL_8250_EM 360 tristate "Support for Emma Mobile integrated serial port" 361 depends on SERIAL_8250 && ARM && HAVE_CLK 362 help 363 Selecting this option will add support for the integrated serial 364 port hardware found on the Emma Mobile line of processors. 365 If unsure, say N. 366 367config SERIAL_8250_RT288X 368 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 369 depends on SERIAL_8250 370 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 371 help 372 Selecting this option will add support for the alternate register 373 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 374 If unsure, say N. 375 376config SERIAL_8250_OMAP 377 tristate "Support for OMAP internal UART (8250 based driver)" 378 depends on SERIAL_8250 && (ARCH_OMAP2PLUS || ARCH_K3) 379 help 380 If you have a machine based on an Texas Instruments OMAP CPU you 381 can enable its onboard serial ports by enabling this option. 382 383 This driver uses ttyS instead of ttyO. 384 385config SERIAL_8250_OMAP_TTYO_FIXUP 386 bool "Replace ttyO with ttyS" 387 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 388 default y 389 help 390 This option replaces the "console=ttyO" argument with the matching 391 ttyS argument if the user did not specified it on the command line. 392 This ensures that the user can see the kernel output during boot 393 which he wouldn't see otherwise. The getty has still to be configured 394 for ttyS instead of ttyO regardless of this option. 395 This option is intended for people who "automatically" enable this 396 driver without knowing that this driver requires a different console= 397 argument. If you read this, please keep this option disabled and 398 instead update your kernel command line. If you prepare a kernel for a 399 distribution or other kind of larger user base then you probably want 400 to keep this option enabled. Otherwise people might complain about a 401 not booting kernel because the serial console remains silent in case 402 they forgot to update the command line. 403 404config SERIAL_8250_LPC18XX 405 tristate "NXP LPC18xx/43xx serial port support" 406 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 407 default ARCH_LPC18XX 408 help 409 If you have a LPC18xx/43xx based board and want to use the 410 serial port, say Y to this option. If unsure, say Y. 411 412config SERIAL_8250_MT6577 413 tristate "Mediatek serial port support" 414 depends on SERIAL_8250 && ARCH_MEDIATEK 415 help 416 If you have a Mediatek based board and want to use the 417 serial port, say Y to this option. If unsure, say N. 418 419config SERIAL_8250_UNIPHIER 420 tristate "Support for UniPhier on-chip UART" 421 depends on SERIAL_8250 422 depends on ARCH_UNIPHIER || COMPILE_TEST 423 help 424 If you have a UniPhier based board and want to use the on-chip 425 serial ports, say Y to this option. If unsure, say N. 426 427config SERIAL_8250_INGENIC 428 tristate "Support for Ingenic SoC serial ports" 429 depends on SERIAL_8250 430 depends on OF_FLATTREE 431 depends on MIPS || COMPILE_TEST 432 help 433 If you have a system using an Ingenic SoC and wish to make use of 434 its UARTs, say Y to this option. If unsure, say N. 435 436config SERIAL_8250_LPSS 437 tristate "Support for serial ports on Intel LPSS platforms" 438 default SERIAL_8250 439 depends on SERIAL_8250 && PCI 440 depends on X86 || COMPILE_TEST 441 select DW_DMAC_CORE if SERIAL_8250_DMA 442 select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS) 443 select RATIONAL 444 help 445 Selecting this option will enable handling of the extra features 446 present on the UART found on various Intel platforms such as: 447 - Intel Baytrail SoC 448 - Intel Braswell SoC 449 - Intel Quark X1000 SoC 450 451config SERIAL_8250_MID 452 tristate "Support for serial ports on Intel MID platforms" 453 default SERIAL_8250 454 depends on SERIAL_8250 && PCI 455 depends on X86 || COMPILE_TEST 456 select HSU_DMA if SERIAL_8250_DMA 457 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 458 select RATIONAL 459 help 460 Selecting this option will enable handling of the extra features 461 present on the UART found on Intel Medfield SOC and various other 462 Intel platforms. 463 464config SERIAL_8250_MOXA 465 tristate "MOXA SmartIO MUE support" 466 depends on SERIAL_8250 && PCI 467 help 468 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 469 If unsure, say N. 470 471 This driver can also be built as a module. The module will be called 472 8250_moxa. If you want to do that, say M here. 473 474config SERIAL_8250_PXA 475 tristate "PXA serial port support" 476 depends on SERIAL_8250 477 depends on ARCH_PXA || ARCH_MMP 478 help 479 If you have a machine based on an Intel XScale PXA2xx CPU you can 480 enable its onboard serial ports by enabling this option. The option is 481 applicable to both devicetree and legacy boards, and early console is 482 part of its support. 483 484config SERIAL_OF_PLATFORM 485 tristate "Devicetree based probing for 8250 ports" 486 depends on SERIAL_8250 && OF 487 help 488 This option is used for all 8250 compatible serial ports that 489 are probed through devicetree, including Open Firmware based 490 PowerPC systems and embedded systems on architectures using the 491 flattened device tree format. 492