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 Exar/Commtech PCI/PCIe device support" 132 depends on SERIAL_8250_PCI 133 default SERIAL_8250 134 help 135 This builds support for XR17C1xx, XR17V3xx and some Commtech 136 422x PCIe serial cards that are not covered by the more generic 137 SERIAL_8250_PCI option. 138 139config SERIAL_8250_HP300 140 tristate 141 depends on SERIAL_8250 && HP300 142 default SERIAL_8250 143 144config SERIAL_8250_CS 145 tristate "8250/16550 PCMCIA device support" 146 depends on PCMCIA && SERIAL_8250 147 ---help--- 148 Say Y here to enable support for 16-bit PCMCIA serial devices, 149 including serial port cards, modems, and the modem functions of 150 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 151 credit-card size devices often used with laptops.) 152 153 To compile this driver as a module, choose M here: the 154 module will be called serial_cs. 155 156 If unsure, say N. 157 158config SERIAL_8250_MEN_MCB 159 tristate "MEN Z125 UART device support" 160 depends on MCB && SERIAL_8250 161 help 162 This enables support for FPGA based UARTs found on many MEN 163 boards. This driver enables support for the Z125 UARTs. 164 165 To compile this driver as a module, chose M here: the 166 module will be called 8250_men_mcb. 167 168 169config SERIAL_8250_NR_UARTS 170 int "Maximum number of 8250/16550 serial ports" 171 depends on SERIAL_8250 172 default "4" 173 help 174 Set this to the number of serial ports you want the driver 175 to support. This includes any ports discovered via ACPI or 176 PCI enumeration and any ports that may be added at run-time 177 via hot-plug, or any ISA multi-port serial cards. 178 179config SERIAL_8250_RUNTIME_UARTS 180 int "Number of 8250/16550 serial ports to register at runtime" 181 depends on SERIAL_8250 182 range 0 SERIAL_8250_NR_UARTS 183 default "4" 184 help 185 Set this to the maximum number of serial ports you want 186 the kernel to register at boot time. This can be overridden 187 with the module parameter "nr_uarts", or boot-time parameter 188 8250.nr_uarts 189 190config SERIAL_8250_EXTENDED 191 bool "Extended 8250/16550 serial driver options" 192 depends on SERIAL_8250 193 help 194 If you wish to use any non-standard features of the standard "dumb" 195 driver, say Y here. This includes HUB6 support, shared serial 196 interrupts, special multiport support, support for more than the 197 four COM 1/2/3/4 boards, etc. 198 199 Note that the answer to this question won't directly affect the 200 kernel: saying N will just cause the configurator to skip all 201 the questions about serial driver options. If unsure, say N. 202 203config SERIAL_8250_MANY_PORTS 204 bool "Support more than 4 legacy serial ports" 205 depends on SERIAL_8250_EXTENDED && !IA64 206 help 207 Say Y here if you have dumb serial boards other than the four 208 standard COM 1/2/3/4 ports. This may happen if you have an AST 209 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 210 from <http://www.tldp.org/docs.html#howto>), or other custom 211 serial port hardware which acts similar to standard serial port 212 hardware. If you only use the standard COM 1/2/3/4 ports, you can 213 say N here to save some memory. You can also say Y if you have an 214 "intelligent" multiport card such as Cyclades, Digiboards, etc. 215 216# 217# Multi-port serial cards 218# 219 220config SERIAL_8250_FOURPORT 221 tristate "Support Fourport cards" 222 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 223 help 224 Say Y here if you have an AST FourPort serial board. 225 226 To compile this driver as a module, choose M here: the module 227 will be called 8250_fourport. 228 229config SERIAL_8250_ACCENT 230 tristate "Support Accent cards" 231 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 232 help 233 Say Y here if you have an Accent Async serial board. 234 235 To compile this driver as a module, choose M here: the module 236 will be called 8250_accent. 237 238config SERIAL_8250_ASPEED_VUART 239 tristate "Aspeed Virtual UART" 240 depends on SERIAL_8250 241 depends on OF 242 help 243 If you want to use the virtual UART (VUART) device on Aspeed 244 BMC platforms, enable this option. This enables the 16550A- 245 compatible device on the local LPC bus, giving a UART device 246 with no physical RS232 connections. 247 248config SERIAL_8250_BOCA 249 tristate "Support Boca cards" 250 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 251 help 252 Say Y here if you have a Boca serial board. Please read the Boca 253 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 254 255 To compile this driver as a module, choose M here: the module 256 will be called 8250_boca. 257 258config SERIAL_8250_EXAR_ST16C554 259 tristate "Support Exar ST16C554/554D Quad UART" 260 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 261 help 262 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 263 tinkering with your Envoy TU301, or have a machine with this UART, 264 say Y here. 265 266 To compile this driver as a module, choose M here: the module 267 will be called 8250_exar_st16c554. 268 269config SERIAL_8250_HUB6 270 tristate "Support Hub6 cards" 271 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 272 help 273 Say Y here if you have a HUB6 serial board. 274 275 To compile this driver as a module, choose M here: the module 276 will be called 8250_hub6. 277 278# 279# Misc. options/drivers. 280# 281 282config SERIAL_8250_SHARE_IRQ 283 bool "Support for sharing serial interrupts" 284 depends on SERIAL_8250_EXTENDED 285 help 286 Some serial boards have hardware support which allows multiple dumb 287 serial ports on the same board to share a single IRQ. To enable 288 support for this in the serial driver, say Y here. 289 290config SERIAL_8250_DETECT_IRQ 291 bool "Autodetect IRQ on standard ports (unsafe)" 292 depends on SERIAL_8250_EXTENDED 293 help 294 Say Y here if you want the kernel to try to guess which IRQ 295 to use for your serial port. 296 297 This is considered unsafe; it is far better to configure the IRQ in 298 a boot script using the setserial command. 299 300 If unsure, say N. 301 302config SERIAL_8250_RSA 303 bool "Support RSA serial ports" 304 depends on SERIAL_8250_EXTENDED 305 help 306 Say Y here if you have a IODATA RSA-DV II/S ISA card and 307 would like to use its >115kbps speeds. 308 You will need to provide module parameter "probe_rsa", or boot-time 309 parameter 8250.probe_rsa with I/O addresses of this card then. 310 311 If you don't have such card, or if unsure, say N. 312 313config SERIAL_8250_ACORN 314 tristate "Acorn expansion card serial port support" 315 depends on ARCH_ACORN && SERIAL_8250 316 help 317 If you have an Atomwide Serial card or Serial Port card for an Acorn 318 system, say Y to this option. The driver can handle 1, 2, or 3 port 319 cards. If unsure, say N. 320 321config SERIAL_8250_BCM2835AUX 322 tristate "BCM2835 auxiliar mini UART support" 323 depends on ARCH_BCM2835 || COMPILE_TEST 324 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 325 help 326 Support for the BCM2835 auxiliar mini UART. 327 328 Features and limitations of the UART are 329 Registers are similar to 16650 registers, 330 set bits in the control registers that are unsupported 331 are ignored and read back as 0 332 7/8 bit operation with 1 start and 1 stop bit 333 8 symbols deep fifo for rx and tx 334 SW controlled RTS and SW readable CTS 335 Clock rate derived from system clock 336 Uses 8 times oversampling (compared to 16 times for 16650) 337 Missing break detection (but break generation) 338 Missing framing error detection 339 Missing parity bit 340 Missing receive time-out interrupt 341 Missing DCD, DSR, DTR and RI signals 342 343 If unsure, say N. 344 345config SERIAL_8250_FSL 346 bool 347 depends on SERIAL_8250_CONSOLE 348 default PPC || ARM || ARM64 349 350config SERIAL_8250_DW 351 tristate "Support for Synopsys DesignWare 8250 quirks" 352 depends on SERIAL_8250 353 help 354 Selecting this option will enable handling of the extra features 355 present in the Synopsys DesignWare APB UART. 356 357config SERIAL_8250_EM 358 tristate "Support for Emma Mobile integrated serial port" 359 depends on SERIAL_8250 && ARM && HAVE_CLK 360 help 361 Selecting this option will add support for the integrated serial 362 port hardware found on the Emma Mobile line of processors. 363 If unsure, say N. 364 365config SERIAL_8250_RT288X 366 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 367 depends on SERIAL_8250 368 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 369 help 370 Selecting this option will add support for the alternate register 371 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 372 If unsure, say N. 373 374config SERIAL_8250_OMAP 375 tristate "Support for OMAP internal UART (8250 based driver)" 376 depends on SERIAL_8250 && ARCH_OMAP2PLUS 377 help 378 If you have a machine based on an Texas Instruments OMAP CPU you 379 can enable its onboard serial ports by enabling this option. 380 381 This driver uses ttyS instead of ttyO. 382 383config SERIAL_8250_OMAP_TTYO_FIXUP 384 bool "Replace ttyO with ttyS" 385 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 386 default y 387 help 388 This option replaces the "console=ttyO" argument with the matching 389 ttyS argument if the user did not specified it on the command line. 390 This ensures that the user can see the kernel output during boot 391 which he wouldn't see otherwise. The getty has still to be configured 392 for ttyS instead of ttyO regardless of this option. 393 This option is intended for people who "automatically" enable this 394 driver without knowing that this driver requires a different console= 395 argument. If you read this, please keep this option disabled and 396 instead update your kernel command line. If you prepare a kernel for a 397 distribution or other kind of larger user base then you probably want 398 to keep this option enabled. Otherwise people might complain about a 399 not booting kernel because the serial console remains silent in case 400 they forgot to update the command line. 401 402config SERIAL_8250_LPC18XX 403 tristate "NXP LPC18xx/43xx serial port support" 404 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 405 default ARCH_LPC18XX 406 help 407 If you have a LPC18xx/43xx based board and want to use the 408 serial port, say Y to this option. If unsure, say Y. 409 410config SERIAL_8250_MT6577 411 tristate "Mediatek serial port support" 412 depends on SERIAL_8250 && ARCH_MEDIATEK 413 help 414 If you have a Mediatek based board and want to use the 415 serial port, say Y to this option. If unsure, say N. 416 417config SERIAL_8250_UNIPHIER 418 tristate "Support for UniPhier on-chip UART" 419 depends on SERIAL_8250 420 depends on ARCH_UNIPHIER || COMPILE_TEST 421 help 422 If you have a UniPhier based board and want to use the on-chip 423 serial ports, say Y to this option. If unsure, say N. 424 425config SERIAL_8250_INGENIC 426 tristate "Support for Ingenic SoC serial ports" 427 depends on SERIAL_8250 428 depends on OF_FLATTREE 429 depends on MIPS || COMPILE_TEST 430 help 431 If you have a system using an Ingenic SoC and wish to make use of 432 its UARTs, say Y to this option. If unsure, say N. 433 434config SERIAL_8250_LPSS 435 tristate "Support for serial ports on Intel LPSS platforms" 436 default SERIAL_8250 437 depends on SERIAL_8250 && PCI 438 depends on X86 || COMPILE_TEST 439 select DW_DMAC_CORE if SERIAL_8250_DMA 440 select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS) 441 select RATIONAL 442 help 443 Selecting this option will enable handling of the extra features 444 present on the UART found on various Intel platforms such as: 445 - Intel Baytrail SoC 446 - Intel Braswell SoC 447 - Intel Quark X1000 SoC 448 449config SERIAL_8250_MID 450 tristate "Support for serial ports on Intel MID platforms" 451 default SERIAL_8250 452 depends on SERIAL_8250 && PCI 453 depends on X86 || COMPILE_TEST 454 select HSU_DMA if SERIAL_8250_DMA 455 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 456 select RATIONAL 457 help 458 Selecting this option will enable handling of the extra features 459 present on the UART found on Intel Medfield SOC and various other 460 Intel platforms. 461 462config SERIAL_8250_MOXA 463 tristate "MOXA SmartIO MUE support" 464 depends on SERIAL_8250 && PCI 465 help 466 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 467 If unsure, say N. 468 469 This driver can also be built as a module. The module will be called 470 8250_moxa. If you want to do that, say M here. 471 472config SERIAL_8250_PXA 473 tristate "PXA serial port support" 474 depends on SERIAL_8250 475 depends on ARCH_PXA || ARCH_MMP 476 help 477 If you have a machine based on an Intel XScale PXA2xx CPU you can 478 enable its onboard serial ports by enabling this option. The option is 479 applicable to both devicetree and legacy boards, and early console is 480 part of its support. 481 482config SERIAL_OF_PLATFORM 483 tristate "Devicetree based probing for 8250 ports" 484 depends on SERIAL_8250 && OF 485 help 486 This option is used for all 8250 compatible serial ports that 487 are probed through devicetree, including Open Firmware based 488 PowerPC systems and embedded systems on architectures using the 489 flattened device tree format. 490