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" if EXPERT 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_HP300 131 tristate 132 depends on SERIAL_8250 && HP300 133 default SERIAL_8250 134 135config SERIAL_8250_CS 136 tristate "8250/16550 PCMCIA device support" 137 depends on PCMCIA && SERIAL_8250 138 ---help--- 139 Say Y here to enable support for 16-bit PCMCIA serial devices, 140 including serial port cards, modems, and the modem functions of 141 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 142 credit-card size devices often used with laptops.) 143 144 To compile this driver as a module, choose M here: the 145 module will be called serial_cs. 146 147 If unsure, say N. 148 149config SERIAL_8250_NR_UARTS 150 int "Maximum number of 8250/16550 serial ports" 151 depends on SERIAL_8250 152 default "4" 153 help 154 Set this to the number of serial ports you want the driver 155 to support. This includes any ports discovered via ACPI or 156 PCI enumeration and any ports that may be added at run-time 157 via hot-plug, or any ISA multi-port serial cards. 158 159config SERIAL_8250_RUNTIME_UARTS 160 int "Number of 8250/16550 serial ports to register at runtime" 161 depends on SERIAL_8250 162 range 0 SERIAL_8250_NR_UARTS 163 default "4" 164 help 165 Set this to the maximum number of serial ports you want 166 the kernel to register at boot time. This can be overridden 167 with the module parameter "nr_uarts", or boot-time parameter 168 8250.nr_uarts 169 170config SERIAL_8250_EXTENDED 171 bool "Extended 8250/16550 serial driver options" 172 depends on SERIAL_8250 173 help 174 If you wish to use any non-standard features of the standard "dumb" 175 driver, say Y here. This includes HUB6 support, shared serial 176 interrupts, special multiport support, support for more than the 177 four COM 1/2/3/4 boards, etc. 178 179 Note that the answer to this question won't directly affect the 180 kernel: saying N will just cause the configurator to skip all 181 the questions about serial driver options. If unsure, say N. 182 183config SERIAL_8250_MANY_PORTS 184 bool "Support more than 4 legacy serial ports" 185 depends on SERIAL_8250_EXTENDED && !IA64 186 help 187 Say Y here if you have dumb serial boards other than the four 188 standard COM 1/2/3/4 ports. This may happen if you have an AST 189 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 190 from <http://www.tldp.org/docs.html#howto>), or other custom 191 serial port hardware which acts similar to standard serial port 192 hardware. If you only use the standard COM 1/2/3/4 ports, you can 193 say N here to save some memory. You can also say Y if you have an 194 "intelligent" multiport card such as Cyclades, Digiboards, etc. 195 196# 197# Multi-port serial cards 198# 199 200config SERIAL_8250_FOURPORT 201 tristate "Support Fourport cards" 202 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 203 help 204 Say Y here if you have an AST FourPort serial board. 205 206 To compile this driver as a module, choose M here: the module 207 will be called 8250_fourport. 208 209config SERIAL_8250_ACCENT 210 tristate "Support Accent cards" 211 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 212 help 213 Say Y here if you have an Accent Async serial board. 214 215 To compile this driver as a module, choose M here: the module 216 will be called 8250_accent. 217 218config SERIAL_8250_BOCA 219 tristate "Support Boca cards" 220 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 221 help 222 Say Y here if you have a Boca serial board. Please read the Boca 223 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 224 225 To compile this driver as a module, choose M here: the module 226 will be called 8250_boca. 227 228config SERIAL_8250_EXAR_ST16C554 229 tristate "Support Exar ST16C554/554D Quad UART" 230 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 231 help 232 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 233 tinkering with your Envoy TU301, or have a machine with this UART, 234 say Y here. 235 236 To compile this driver as a module, choose M here: the module 237 will be called 8250_exar_st16c554. 238 239config SERIAL_8250_HUB6 240 tristate "Support Hub6 cards" 241 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 242 help 243 Say Y here if you have a HUB6 serial board. 244 245 To compile this driver as a module, choose M here: the module 246 will be called 8250_hub6. 247 248# 249# Misc. options/drivers. 250# 251 252config SERIAL_8250_SHARE_IRQ 253 bool "Support for sharing serial interrupts" 254 depends on SERIAL_8250_EXTENDED 255 help 256 Some serial boards have hardware support which allows multiple dumb 257 serial ports on the same board to share a single IRQ. To enable 258 support for this in the serial driver, say Y here. 259 260config SERIAL_8250_DETECT_IRQ 261 bool "Autodetect IRQ on standard ports (unsafe)" 262 depends on SERIAL_8250_EXTENDED 263 help 264 Say Y here if you want the kernel to try to guess which IRQ 265 to use for your serial port. 266 267 This is considered unsafe; it is far better to configure the IRQ in 268 a boot script using the setserial command. 269 270 If unsure, say N. 271 272config SERIAL_8250_RSA 273 bool "Support RSA serial ports" 274 depends on SERIAL_8250_EXTENDED 275 help 276 Say Y here if you have a IODATA RSA-DV II/S ISA card and 277 would like to use its >115kbps speeds. 278 You will need to provide module parameter "probe_rsa", or boot-time 279 parameter 8250.probe_rsa with I/O addresses of this card then. 280 281 If you don't have such card, or if unsure, say N. 282 283config SERIAL_8250_ACORN 284 tristate "Acorn expansion card serial port support" 285 depends on ARCH_ACORN && SERIAL_8250 286 help 287 If you have an Atomwide Serial card or Serial Port card for an Acorn 288 system, say Y to this option. The driver can handle 1, 2, or 3 port 289 cards. If unsure, say N. 290 291config SERIAL_8250_BCM2835AUX 292 tristate "BCM2835 auxiliar mini UART support" 293 depends on ARCH_BCM2835 || COMPILE_TEST 294 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 295 help 296 Support for the BCM2835 auxiliar mini UART. 297 298 Features and limitations of the UART are 299 Registers are similar to 16650 registers, 300 set bits in the control registers that are unsupported 301 are ignored and read back as 0 302 7/8 bit operation with 1 start and 1 stop bit 303 8 symbols deep fifo for rx and tx 304 SW controlled RTS and SW readable CTS 305 Clock rate derived from system clock 306 Uses 8 times oversampling (compared to 16 times for 16650) 307 Missing break detection (but break generation) 308 Missing framing error detection 309 Missing parity bit 310 Missing receive time-out interrupt 311 Missing DCD, DSR, DTR and RI signals 312 313 If unsure, say N. 314 315config SERIAL_8250_FSL 316 bool 317 depends on SERIAL_8250_CONSOLE 318 default PPC || ARM || ARM64 319 320config SERIAL_8250_DW 321 tristate "Support for Synopsys DesignWare 8250 quirks" 322 depends on SERIAL_8250 323 help 324 Selecting this option will enable handling of the extra features 325 present in the Synopsys DesignWare APB UART. 326 327config SERIAL_8250_EM 328 tristate "Support for Emma Mobile integrated serial port" 329 depends on SERIAL_8250 && ARM && HAVE_CLK 330 help 331 Selecting this option will add support for the integrated serial 332 port hardware found on the Emma Mobile line of processors. 333 If unsure, say N. 334 335config SERIAL_8250_RT288X 336 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 337 depends on SERIAL_8250 338 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 339 help 340 Selecting this option will add support for the alternate register 341 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 342 If unsure, say N. 343 344config SERIAL_8250_OMAP 345 tristate "Support for OMAP internal UART (8250 based driver)" 346 depends on SERIAL_8250 && ARCH_OMAP2PLUS 347 help 348 If you have a machine based on an Texas Instruments OMAP CPU you 349 can enable its onboard serial ports by enabling this option. 350 351 This driver uses ttyS instead of ttyO. 352 353config SERIAL_8250_OMAP_TTYO_FIXUP 354 bool "Replace ttyO with ttyS" 355 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 356 default y 357 help 358 This option replaces the "console=ttyO" argument with the matching 359 ttyS argument if the user did not specified it on the command line. 360 This ensures that the user can see the kernel output during boot 361 which he wouldn't see otherwise. The getty has still to be configured 362 for ttyS instead of ttyO regardless of this option. 363 This option is intended for people who "automatically" enable this 364 driver without knowing that this driver requires a different console= 365 argument. If you read this, please keep this option disabled and 366 instead update your kernel command line. If you prepare a kernel for a 367 distribution or other kind of larger user base then you probably want 368 to keep this option enabled. Otherwise people might complain about a 369 not booting kernel because the serial console remains silent in case 370 they forgot to update the command line. 371 372config SERIAL_8250_LPC18XX 373 tristate "NXP LPC18xx/43xx serial port support" 374 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 375 default ARCH_LPC18XX 376 help 377 If you have a LPC18xx/43xx based board and want to use the 378 serial port, say Y to this option. If unsure, say Y. 379 380config SERIAL_8250_MT6577 381 tristate "Mediatek serial port support" 382 depends on SERIAL_8250 && ARCH_MEDIATEK 383 help 384 If you have a Mediatek based board and want to use the 385 serial port, say Y to this option. If unsure, say N. 386 387config SERIAL_8250_UNIPHIER 388 tristate "Support for UniPhier on-chip UART" 389 depends on SERIAL_8250 390 depends on ARCH_UNIPHIER || COMPILE_TEST 391 help 392 If you have a UniPhier based board and want to use the on-chip 393 serial ports, say Y to this option. If unsure, say N. 394 395config SERIAL_8250_INGENIC 396 tristate "Support for Ingenic SoC serial ports" 397 depends on SERIAL_8250 398 depends on OF_FLATTREE 399 depends on MIPS || COMPILE_TEST 400 help 401 If you have a system using an Ingenic SoC and wish to make use of 402 its UARTs, say Y to this option. If unsure, say N. 403 404config SERIAL_8250_LPSS 405 tristate "Support for serial ports on Intel LPSS platforms" if EXPERT 406 default SERIAL_8250 407 depends on SERIAL_8250 && PCI 408 depends on X86 || COMPILE_TEST 409 select DW_DMAC_CORE if SERIAL_8250_DMA 410 select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS) 411 select RATIONAL 412 help 413 Selecting this option will enable handling of the extra features 414 present on the UART found on various Intel platforms such as: 415 - Intel Baytrail SoC 416 - Intel Braswell SoC 417 - Intel Quark X1000 SoC 418 419config SERIAL_8250_MID 420 tristate "Support for serial ports on Intel MID platforms" if EXPERT 421 default SERIAL_8250 422 depends on SERIAL_8250 && PCI 423 depends on X86 || COMPILE_TEST 424 select HSU_DMA if SERIAL_8250_DMA 425 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 426 select RATIONAL 427 help 428 Selecting this option will enable handling of the extra features 429 present on the UART found on Intel Medfield SOC and various other 430 Intel platforms. 431 432config SERIAL_8250_MOXA 433 tristate "MOXA SmartIO MUE support" 434 depends on SERIAL_8250 && PCI 435 help 436 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 437 If unsure, say N. 438 439 This driver can also be built as a module. The module will be called 440 8250_moxa. If you want to do that, say M here. 441 442config SERIAL_8250_PXA 443 tristate "PXA serial port support" 444 depends on SERIAL_8250 445 depends on ARCH_PXA || ARCH_MMP 446 help 447 If you have a machine based on an Intel XScale PXA2xx CPU you can 448 enable its onboard serial ports by enabling this option. The option is 449 applicable to both devicetree and legacy boards, and early console is 450 part of its support. 451 452config SERIAL_OF_PLATFORM 453 tristate "Devicetree based probing for 8250 ports" 454 depends on SERIAL_8250 && OF 455 help 456 This option is used for all 8250 compatible serial ports that 457 are probed through devicetree, including Open Firmware based 458 PowerPC systems and embedded systems on architectures using the 459 flattened device tree format. 460