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