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_CONSOLE 61 bool "Console on 8250/16550 and compatible serial port" 62 depends on SERIAL_8250=y 63 select SERIAL_CORE_CONSOLE 64 select SERIAL_EARLYCON 65 ---help--- 66 If you say Y here, it will be possible to use a serial port as the 67 system console (the system console is the device which receives all 68 kernel messages and warnings and which allows logins in single user 69 mode). This could be useful if some terminal or printer is connected 70 to that serial port. 71 72 Even if you say Y here, the currently visible virtual console 73 (/dev/tty0) will still be used as the system console by default, but 74 you can alter that using a kernel command line option such as 75 "console=ttyS1". (Try "man bootparam" or see the documentation of 76 your boot loader (grub or lilo or loadlin) about how to pass options 77 to the kernel at boot time.) 78 79 If you don't have a VGA card installed and you say Y here, the 80 kernel will automatically use the first serial line, /dev/ttyS0, as 81 system console. 82 83 You can set that using a kernel command line option such as 84 "console=uart8250,io,0x3f8,9600n8" 85 "console=uart8250,mmio,0xff5e0000,115200n8". 86 and it will switch to normal serial console when the corresponding 87 port is ready. 88 "earlycon=uart8250,io,0x3f8,9600n8" 89 "earlycon=uart8250,mmio,0xff5e0000,115200n8". 90 it will not only setup early console. 91 92 If unsure, say N. 93 94config SERIAL_8250_GSC 95 tristate 96 depends on SERIAL_8250 && GSC 97 default SERIAL_8250 98 99config SERIAL_8250_DMA 100 bool "DMA support for 16550 compatible UART controllers" if EXPERT 101 depends on SERIAL_8250 && DMADEVICES=y 102 default SERIAL_8250 103 help 104 This builds DMA support that can be used with 8250/16650 105 compatible UART controllers that support DMA signaling. 106 107config SERIAL_8250_PCI 108 tristate "8250/16550 PCI device support" if EXPERT 109 depends on SERIAL_8250 && PCI 110 default SERIAL_8250 111 select RATIONAL 112 help 113 This builds standard PCI serial support. You may be able to 114 disable this feature if you only need legacy serial support. 115 Saves about 9K. 116 Note that serial ports on NetMos 9835 Multi-I/O cards are handled 117 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL. 118 119config SERIAL_8250_HP300 120 tristate 121 depends on SERIAL_8250 && HP300 122 default SERIAL_8250 123 124config SERIAL_8250_CS 125 tristate "8250/16550 PCMCIA device support" 126 depends on PCMCIA && SERIAL_8250 127 ---help--- 128 Say Y here to enable support for 16-bit PCMCIA serial devices, 129 including serial port cards, modems, and the modem functions of 130 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 131 credit-card size devices often used with laptops.) 132 133 To compile this driver as a module, choose M here: the 134 module will be called serial_cs. 135 136 If unsure, say N. 137 138config SERIAL_8250_NR_UARTS 139 int "Maximum number of 8250/16550 serial ports" 140 depends on SERIAL_8250 141 default "4" 142 help 143 Set this to the number of serial ports you want the driver 144 to support. This includes any ports discovered via ACPI or 145 PCI enumeration and any ports that may be added at run-time 146 via hot-plug, or any ISA multi-port serial cards. 147 148config SERIAL_8250_RUNTIME_UARTS 149 int "Number of 8250/16550 serial ports to register at runtime" 150 depends on SERIAL_8250 151 range 0 SERIAL_8250_NR_UARTS 152 default "4" 153 help 154 Set this to the maximum number of serial ports you want 155 the kernel to register at boot time. This can be overridden 156 with the module parameter "nr_uarts", or boot-time parameter 157 8250.nr_uarts 158 159config SERIAL_8250_EXTENDED 160 bool "Extended 8250/16550 serial driver options" 161 depends on SERIAL_8250 162 help 163 If you wish to use any non-standard features of the standard "dumb" 164 driver, say Y here. This includes HUB6 support, shared serial 165 interrupts, special multiport support, support for more than the 166 four COM 1/2/3/4 boards, etc. 167 168 Note that the answer to this question won't directly affect the 169 kernel: saying N will just cause the configurator to skip all 170 the questions about serial driver options. If unsure, say N. 171 172config SERIAL_8250_MANY_PORTS 173 bool "Support more than 4 legacy serial ports" 174 depends on SERIAL_8250_EXTENDED && !IA64 175 help 176 Say Y here if you have dumb serial boards other than the four 177 standard COM 1/2/3/4 ports. This may happen if you have an AST 178 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 179 from <http://www.tldp.org/docs.html#howto>), or other custom 180 serial port hardware which acts similar to standard serial port 181 hardware. If you only use the standard COM 1/2/3/4 ports, you can 182 say N here to save some memory. You can also say Y if you have an 183 "intelligent" multiport card such as Cyclades, Digiboards, etc. 184 185# 186# Multi-port serial cards 187# 188 189config SERIAL_8250_FOURPORT 190 tristate "Support Fourport cards" 191 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 192 help 193 Say Y here if you have an AST FourPort serial board. 194 195 To compile this driver as a module, choose M here: the module 196 will be called 8250_fourport. 197 198config SERIAL_8250_ACCENT 199 tristate "Support Accent cards" 200 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 201 help 202 Say Y here if you have an Accent Async serial board. 203 204 To compile this driver as a module, choose M here: the module 205 will be called 8250_accent. 206 207config SERIAL_8250_BOCA 208 tristate "Support Boca cards" 209 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 210 help 211 Say Y here if you have a Boca serial board. Please read the Boca 212 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 213 214 To compile this driver as a module, choose M here: the module 215 will be called 8250_boca. 216 217config SERIAL_8250_EXAR_ST16C554 218 tristate "Support Exar ST16C554/554D Quad UART" 219 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 220 help 221 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 222 tinkering with your Envoy TU301, or have a machine with this UART, 223 say Y here. 224 225 To compile this driver as a module, choose M here: the module 226 will be called 8250_exar_st16c554. 227 228config SERIAL_8250_HUB6 229 tristate "Support Hub6 cards" 230 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 231 help 232 Say Y here if you have a HUB6 serial board. 233 234 To compile this driver as a module, choose M here: the module 235 will be called 8250_hub6. 236 237# 238# Misc. options/drivers. 239# 240 241config SERIAL_8250_SHARE_IRQ 242 bool "Support for sharing serial interrupts" 243 depends on SERIAL_8250_EXTENDED 244 help 245 Some serial boards have hardware support which allows multiple dumb 246 serial ports on the same board to share a single IRQ. To enable 247 support for this in the serial driver, say Y here. 248 249config SERIAL_8250_DETECT_IRQ 250 bool "Autodetect IRQ on standard ports (unsafe)" 251 depends on SERIAL_8250_EXTENDED 252 help 253 Say Y here if you want the kernel to try to guess which IRQ 254 to use for your serial port. 255 256 This is considered unsafe; it is far better to configure the IRQ in 257 a boot script using the setserial command. 258 259 If unsure, say N. 260 261config SERIAL_8250_RSA 262 bool "Support RSA serial ports" 263 depends on SERIAL_8250_EXTENDED 264 help 265 Say Y here if you have a IODATA RSA-DV II/S ISA card and 266 would like to use its >115kbps speeds. 267 You will need to provide module parameter "probe_rsa", or boot-time 268 parameter 8250.probe_rsa with I/O addresses of this card then. 269 270 If you don't have such card, or if unsure, say N. 271 272config SERIAL_8250_ACORN 273 tristate "Acorn expansion card serial port support" 274 depends on ARCH_ACORN && SERIAL_8250 275 help 276 If you have an Atomwide Serial card or Serial Port card for an Acorn 277 system, say Y to this option. The driver can handle 1, 2, or 3 port 278 cards. If unsure, say N. 279 280config SERIAL_8250_BCM2835AUX 281 tristate "BCM2835 auxiliar mini UART support" 282 depends on ARCH_BCM2835 || COMPILE_TEST 283 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 284 help 285 Support for the BCM2835 auxiliar mini UART. 286 287 Features and limitations of the UART are 288 Registers are similar to 16650 registers, 289 set bits in the control registers that are unsupported 290 are ignored and read back as 0 291 7/8 bit operation with 1 start and 1 stop bit 292 8 symbols deep fifo for rx and tx 293 SW controlled RTS and SW readable CTS 294 Clock rate derived from system clock 295 Uses 8 times oversampling (compared to 16 times for 16650) 296 Missing break detection (but break generation) 297 Missing framing error detection 298 Missing parity bit 299 Missing receive time-out interrupt 300 Missing DCD, DSR, DTR and RI signals 301 302 If unsure, say N. 303 304config SERIAL_8250_FSL 305 bool 306 depends on SERIAL_8250_CONSOLE 307 default PPC || ARM || ARM64 308 309config SERIAL_8250_DW 310 tristate "Support for Synopsys DesignWare 8250 quirks" 311 depends on SERIAL_8250 312 help 313 Selecting this option will enable handling of the extra features 314 present in the Synopsys DesignWare APB UART. 315 316config SERIAL_8250_EM 317 tristate "Support for Emma Mobile integrated serial port" 318 depends on SERIAL_8250 && ARM && HAVE_CLK 319 help 320 Selecting this option will add support for the integrated serial 321 port hardware found on the Emma Mobile line of processors. 322 If unsure, say N. 323 324config SERIAL_8250_RT288X 325 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 326 depends on SERIAL_8250 327 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 328 help 329 Selecting this option will add support for the alternate register 330 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 331 If unsure, say N. 332 333config SERIAL_8250_OMAP 334 tristate "Support for OMAP internal UART (8250 based driver)" 335 depends on SERIAL_8250 && ARCH_OMAP2PLUS 336 help 337 If you have a machine based on an Texas Instruments OMAP CPU you 338 can enable its onboard serial ports by enabling this option. 339 340 This driver uses ttyS instead of ttyO. 341 342config SERIAL_8250_OMAP_TTYO_FIXUP 343 bool "Replace ttyO with ttyS" 344 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 345 default y 346 help 347 This option replaces the "console=ttyO" argument with the matching 348 ttyS argument if the user did not specified it on the command line. 349 This ensures that the user can see the kernel output during boot 350 which he wouldn't see otherwise. The getty has still to be configured 351 for ttyS instead of ttyO regardless of this option. 352 This option is intended for people who "automatically" enable this 353 driver without knowing that this driver requires a different console= 354 argument. If you read this, please keep this option disabled and 355 instead update your kernel command line. If you prepare a kernel for a 356 distribution or other kind of larger user base then you probably want 357 to keep this option enabled. Otherwise people might complain about a 358 not booting kernel because the serial console remains silent in case 359 they forgot to update the command line. 360 361config SERIAL_8250_FINTEK 362 tristate "Support for Fintek F81216A LPC to 4 UART" 363 depends on SERIAL_8250 && PNP 364 help 365 Selecting this option will add support for the Fintek F81216A 366 LPC to 4 UART. This device has some RS485 functionality not available 367 through the PNP driver. If unsure, say N. 368 369config SERIAL_8250_LPC18XX 370 tristate "NXP LPC18xx/43xx serial port support" 371 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 372 default ARCH_LPC18XX 373 help 374 If you have a LPC18xx/43xx based board and want to use the 375 serial port, say Y to this option. If unsure, say Y. 376 377config SERIAL_8250_MT6577 378 tristate "Mediatek serial port support" 379 depends on SERIAL_8250 && ARCH_MEDIATEK 380 help 381 If you have a Mediatek based board and want to use the 382 serial port, say Y to this option. If unsure, say N. 383 384config SERIAL_8250_UNIPHIER 385 tristate "Support for UniPhier on-chip UART" 386 depends on SERIAL_8250 && ARCH_UNIPHIER 387 help 388 If you have a UniPhier based board and want to use the on-chip 389 serial ports, say Y to this option. If unsure, say N. 390 391config SERIAL_8250_INGENIC 392 tristate "Support for Ingenic SoC serial ports" 393 depends on SERIAL_8250 394 depends on (OF_FLATTREE && SERIAL_8250_CONSOLE) || !SERIAL_EARLYCON 395 depends on MIPS || COMPILE_TEST 396 help 397 If you have a system using an Ingenic SoC and wish to make use of 398 its UARTs, say Y to this option. If unsure, say N. 399 400config SERIAL_8250_MID 401 tristate "Support for serial ports on Intel MID platforms" 402 depends on SERIAL_8250 && PCI 403 select HSU_DMA if SERIAL_8250_DMA 404 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 405 select RATIONAL 406 help 407 Selecting this option will enable handling of the extra features 408 present on the UART found on Intel Medfield SOC and various other 409 Intel platforms. 410 411config SERIAL_8250_MOXA 412 tristate "MOXA SmartIO MUE support" 413 depends on SERIAL_8250 && PCI 414 help 415 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 416 If unsure, say N. 417 418 This driver can also be built as a module. The module will be called 419 8250_moxa. If you want to do that, say M here. 420 421config SERIAL_OF_PLATFORM 422 tristate "Devicetree based probing for 8250 ports" 423 depends on SERIAL_8250 && OF 424 help 425 This option is used for all 8250 compatible serial ports that 426 are probed through devicetree, including Open Firmware based 427 PowerPC systems and embedded systems on architectures using the 428 flattened device tree format. 429