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 Z125 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 Z125 UARTs. 165 166 To compile this driver as a module, chose M here: the 167 module will be called 8250_men_mcb. 168 169 170config SERIAL_8250_NR_UARTS 171 int "Maximum number of 8250/16550 serial ports" 172 depends on SERIAL_8250 173 default "4" 174 help 175 Set this to the number of serial ports you want the driver 176 to support. This includes any ports discovered via ACPI or 177 PCI enumeration and any ports that may be added at run-time 178 via hot-plug, or any ISA multi-port serial cards. 179 180config SERIAL_8250_RUNTIME_UARTS 181 int "Number of 8250/16550 serial ports to register at runtime" 182 depends on SERIAL_8250 183 range 0 SERIAL_8250_NR_UARTS 184 default "4" 185 help 186 Set this to the maximum number of serial ports you want 187 the kernel to register at boot time. This can be overridden 188 with the module parameter "nr_uarts", or boot-time parameter 189 8250.nr_uarts 190 191config SERIAL_8250_EXTENDED 192 bool "Extended 8250/16550 serial driver options" 193 depends on SERIAL_8250 194 help 195 If you wish to use any non-standard features of the standard "dumb" 196 driver, say Y here. This includes HUB6 support, shared serial 197 interrupts, special multiport support, support for more than the 198 four COM 1/2/3/4 boards, etc. 199 200 Note that the answer to this question won't directly affect the 201 kernel: saying N will just cause the configurator to skip all 202 the questions about serial driver options. If unsure, say N. 203 204config SERIAL_8250_MANY_PORTS 205 bool "Support more than 4 legacy serial ports" 206 depends on SERIAL_8250_EXTENDED && !IA64 207 help 208 Say Y here if you have dumb serial boards other than the four 209 standard COM 1/2/3/4 ports. This may happen if you have an AST 210 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 211 from <http://www.tldp.org/docs.html#howto>), or other custom 212 serial port hardware which acts similar to standard serial port 213 hardware. If you only use the standard COM 1/2/3/4 ports, you can 214 say N here to save some memory. You can also say Y if you have an 215 "intelligent" multiport card such as Cyclades, Digiboards, etc. 216 217# 218# Multi-port serial cards 219# 220 221config SERIAL_8250_FOURPORT 222 tristate "Support Fourport cards" 223 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 224 help 225 Say Y here if you have an AST FourPort serial board. 226 227 To compile this driver as a module, choose M here: the module 228 will be called 8250_fourport. 229 230config SERIAL_8250_ACCENT 231 tristate "Support Accent cards" 232 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 233 help 234 Say Y here if you have an Accent Async serial board. 235 236 To compile this driver as a module, choose M here: the module 237 will be called 8250_accent. 238 239config SERIAL_8250_ASPEED_VUART 240 tristate "Aspeed Virtual UART" 241 depends on SERIAL_8250 242 depends on OF 243 help 244 If you want to use the virtual UART (VUART) device on Aspeed 245 BMC platforms, enable this option. This enables the 16550A- 246 compatible device on the local LPC bus, giving a UART device 247 with no physical RS232 connections. 248 249config SERIAL_8250_BOCA 250 tristate "Support Boca cards" 251 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 252 help 253 Say Y here if you have a Boca serial board. Please read the Boca 254 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 255 256 To compile this driver as a module, choose M here: the module 257 will be called 8250_boca. 258 259config SERIAL_8250_EXAR_ST16C554 260 tristate "Support Exar ST16C554/554D Quad UART" 261 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 262 help 263 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 264 tinkering with your Envoy TU301, or have a machine with this UART, 265 say Y here. 266 267 To compile this driver as a module, choose M here: the module 268 will be called 8250_exar_st16c554. 269 270config SERIAL_8250_HUB6 271 tristate "Support Hub6 cards" 272 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 273 help 274 Say Y here if you have a HUB6 serial board. 275 276 To compile this driver as a module, choose M here: the module 277 will be called 8250_hub6. 278 279# 280# Misc. options/drivers. 281# 282 283config SERIAL_8250_SHARE_IRQ 284 bool "Support for sharing serial interrupts" 285 depends on SERIAL_8250_EXTENDED 286 help 287 Some serial boards have hardware support which allows multiple dumb 288 serial ports on the same board to share a single IRQ. To enable 289 support for this in the serial driver, say Y here. 290 291config SERIAL_8250_DETECT_IRQ 292 bool "Autodetect IRQ on standard ports (unsafe)" 293 depends on SERIAL_8250_EXTENDED 294 help 295 Say Y here if you want the kernel to try to guess which IRQ 296 to use for your serial port. 297 298 This is considered unsafe; it is far better to configure the IRQ in 299 a boot script using the setserial command. 300 301 If unsure, say N. 302 303config SERIAL_8250_RSA 304 bool "Support RSA serial ports" 305 depends on SERIAL_8250_EXTENDED 306 help 307 Say Y here if you have a IODATA RSA-DV II/S ISA card and 308 would like to use its >115kbps speeds. 309 You will need to provide module parameter "probe_rsa", or boot-time 310 parameter 8250.probe_rsa with I/O addresses of this card then. 311 312 If you don't have such card, or if unsure, say N. 313 314config SERIAL_8250_ACORN 315 tristate "Acorn expansion card serial port support" 316 depends on ARCH_ACORN && SERIAL_8250 317 help 318 If you have an Atomwide Serial card or Serial Port card for an Acorn 319 system, say Y to this option. The driver can handle 1, 2, or 3 port 320 cards. If unsure, say N. 321 322config SERIAL_8250_BCM2835AUX 323 tristate "BCM2835 auxiliar mini UART support" 324 depends on ARCH_BCM2835 || COMPILE_TEST 325 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 326 help 327 Support for the BCM2835 auxiliar mini UART. 328 329 Features and limitations of the UART are 330 Registers are similar to 16650 registers, 331 set bits in the control registers that are unsupported 332 are ignored and read back as 0 333 7/8 bit operation with 1 start and 1 stop bit 334 8 symbols deep fifo for rx and tx 335 SW controlled RTS and SW readable CTS 336 Clock rate derived from system clock 337 Uses 8 times oversampling (compared to 16 times for 16650) 338 Missing break detection (but break generation) 339 Missing framing error detection 340 Missing parity bit 341 Missing receive time-out interrupt 342 Missing DCD, DSR, DTR and RI signals 343 344 If unsure, say N. 345 346config SERIAL_8250_FSL 347 bool 348 depends on SERIAL_8250_CONSOLE 349 default PPC || ARM || ARM64 350 351config SERIAL_8250_DW 352 tristate "Support for Synopsys DesignWare 8250 quirks" 353 depends on SERIAL_8250 354 help 355 Selecting this option will enable handling of the extra features 356 present in the Synopsys DesignWare APB UART. 357 358config SERIAL_8250_EM 359 tristate "Support for Emma Mobile integrated serial port" 360 depends on SERIAL_8250 && ARM && HAVE_CLK 361 help 362 Selecting this option will add support for the integrated serial 363 port hardware found on the Emma Mobile line of processors. 364 If unsure, say N. 365 366config SERIAL_8250_RT288X 367 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 368 depends on SERIAL_8250 369 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 370 help 371 Selecting this option will add support for the alternate register 372 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 373 If unsure, say N. 374 375config SERIAL_8250_OMAP 376 tristate "Support for OMAP internal UART (8250 based driver)" 377 depends on SERIAL_8250 && ARCH_OMAP2PLUS 378 help 379 If you have a machine based on an Texas Instruments OMAP CPU you 380 can enable its onboard serial ports by enabling this option. 381 382 This driver uses ttyS instead of ttyO. 383 384config SERIAL_8250_OMAP_TTYO_FIXUP 385 bool "Replace ttyO with ttyS" 386 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 387 default y 388 help 389 This option replaces the "console=ttyO" argument with the matching 390 ttyS argument if the user did not specified it on the command line. 391 This ensures that the user can see the kernel output during boot 392 which he wouldn't see otherwise. The getty has still to be configured 393 for ttyS instead of ttyO regardless of this option. 394 This option is intended for people who "automatically" enable this 395 driver without knowing that this driver requires a different console= 396 argument. If you read this, please keep this option disabled and 397 instead update your kernel command line. If you prepare a kernel for a 398 distribution or other kind of larger user base then you probably want 399 to keep this option enabled. Otherwise people might complain about a 400 not booting kernel because the serial console remains silent in case 401 they forgot to update the command line. 402 403config SERIAL_8250_LPC18XX 404 tristate "NXP LPC18xx/43xx serial port support" 405 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 406 default ARCH_LPC18XX 407 help 408 If you have a LPC18xx/43xx based board and want to use the 409 serial port, say Y to this option. If unsure, say Y. 410 411config SERIAL_8250_MT6577 412 tristate "Mediatek serial port support" 413 depends on SERIAL_8250 && ARCH_MEDIATEK 414 help 415 If you have a Mediatek based board and want to use the 416 serial port, say Y to this option. If unsure, say N. 417 418config SERIAL_8250_UNIPHIER 419 tristate "Support for UniPhier on-chip UART" 420 depends on SERIAL_8250 421 depends on ARCH_UNIPHIER || COMPILE_TEST 422 help 423 If you have a UniPhier based board and want to use the on-chip 424 serial ports, say Y to this option. If unsure, say N. 425 426config SERIAL_8250_INGENIC 427 tristate "Support for Ingenic SoC serial ports" 428 depends on SERIAL_8250 429 depends on OF_FLATTREE 430 depends on MIPS || COMPILE_TEST 431 help 432 If you have a system using an Ingenic SoC and wish to make use of 433 its UARTs, say Y to this option. If unsure, say N. 434 435config SERIAL_8250_LPSS 436 tristate "Support for serial ports on Intel LPSS platforms" 437 default SERIAL_8250 438 depends on SERIAL_8250 && PCI 439 depends on X86 || COMPILE_TEST 440 select DW_DMAC_CORE if SERIAL_8250_DMA 441 select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS) 442 select RATIONAL 443 help 444 Selecting this option will enable handling of the extra features 445 present on the UART found on various Intel platforms such as: 446 - Intel Baytrail SoC 447 - Intel Braswell SoC 448 - Intel Quark X1000 SoC 449 450config SERIAL_8250_MID 451 tristate "Support for serial ports on Intel MID platforms" 452 default SERIAL_8250 453 depends on SERIAL_8250 && PCI 454 depends on X86 || COMPILE_TEST 455 select HSU_DMA if SERIAL_8250_DMA 456 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 457 select RATIONAL 458 help 459 Selecting this option will enable handling of the extra features 460 present on the UART found on Intel Medfield SOC and various other 461 Intel platforms. 462 463config SERIAL_8250_MOXA 464 tristate "MOXA SmartIO MUE support" 465 depends on SERIAL_8250 && PCI 466 help 467 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 468 If unsure, say N. 469 470 This driver can also be built as a module. The module will be called 471 8250_moxa. If you want to do that, say M here. 472 473config SERIAL_8250_PXA 474 tristate "PXA serial port support" 475 depends on SERIAL_8250 476 depends on ARCH_PXA || ARCH_MMP 477 help 478 If you have a machine based on an Intel XScale PXA2xx CPU you can 479 enable its onboard serial ports by enabling this option. The option is 480 applicable to both devicetree and legacy boards, and early console is 481 part of its support. 482 483config SERIAL_OF_PLATFORM 484 tristate "Devicetree based probing for 8250 ports" 485 depends on SERIAL_8250 && OF 486 help 487 This option is used for all 8250 compatible serial ports that 488 are probed through devicetree, including Open Firmware based 489 PowerPC systems and embedded systems on architectures using the 490 flattened device tree format. 491