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 select SERIAL_MCTRL_GPIO if GPIOLIB 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" if EXPERT 122 depends on SERIAL_8250 && PCI 123 default SERIAL_8250 124 select RATIONAL 125 help 126 This builds standard PCI serial support. You may be able to 127 disable this feature if you only need legacy serial support. 128 Saves about 9K. 129 Note that serial ports on NetMos 9835 Multi-I/O cards are handled 130 by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL. 131 132config SERIAL_8250_HP300 133 tristate 134 depends on SERIAL_8250 && HP300 135 default SERIAL_8250 136 137config SERIAL_8250_CS 138 tristate "8250/16550 PCMCIA device support" 139 depends on PCMCIA && SERIAL_8250 140 ---help--- 141 Say Y here to enable support for 16-bit PCMCIA serial devices, 142 including serial port cards, modems, and the modem functions of 143 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are 144 credit-card size devices often used with laptops.) 145 146 To compile this driver as a module, choose M here: the 147 module will be called serial_cs. 148 149 If unsure, say N. 150 151config SERIAL_8250_NR_UARTS 152 int "Maximum number of 8250/16550 serial ports" 153 depends on SERIAL_8250 154 default "4" 155 help 156 Set this to the number of serial ports you want the driver 157 to support. This includes any ports discovered via ACPI or 158 PCI enumeration and any ports that may be added at run-time 159 via hot-plug, or any ISA multi-port serial cards. 160 161config SERIAL_8250_RUNTIME_UARTS 162 int "Number of 8250/16550 serial ports to register at runtime" 163 depends on SERIAL_8250 164 range 0 SERIAL_8250_NR_UARTS 165 default "4" 166 help 167 Set this to the maximum number of serial ports you want 168 the kernel to register at boot time. This can be overridden 169 with the module parameter "nr_uarts", or boot-time parameter 170 8250.nr_uarts 171 172config SERIAL_8250_EXTENDED 173 bool "Extended 8250/16550 serial driver options" 174 depends on SERIAL_8250 175 help 176 If you wish to use any non-standard features of the standard "dumb" 177 driver, say Y here. This includes HUB6 support, shared serial 178 interrupts, special multiport support, support for more than the 179 four COM 1/2/3/4 boards, etc. 180 181 Note that the answer to this question won't directly affect the 182 kernel: saying N will just cause the configurator to skip all 183 the questions about serial driver options. If unsure, say N. 184 185config SERIAL_8250_MANY_PORTS 186 bool "Support more than 4 legacy serial ports" 187 depends on SERIAL_8250_EXTENDED && !IA64 188 help 189 Say Y here if you have dumb serial boards other than the four 190 standard COM 1/2/3/4 ports. This may happen if you have an AST 191 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available 192 from <http://www.tldp.org/docs.html#howto>), or other custom 193 serial port hardware which acts similar to standard serial port 194 hardware. If you only use the standard COM 1/2/3/4 ports, you can 195 say N here to save some memory. You can also say Y if you have an 196 "intelligent" multiport card such as Cyclades, Digiboards, etc. 197 198# 199# Multi-port serial cards 200# 201 202config SERIAL_8250_FOURPORT 203 tristate "Support Fourport cards" 204 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 205 help 206 Say Y here if you have an AST FourPort serial board. 207 208 To compile this driver as a module, choose M here: the module 209 will be called 8250_fourport. 210 211config SERIAL_8250_ACCENT 212 tristate "Support Accent cards" 213 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 214 help 215 Say Y here if you have an Accent Async serial board. 216 217 To compile this driver as a module, choose M here: the module 218 will be called 8250_accent. 219 220config SERIAL_8250_BOCA 221 tristate "Support Boca cards" 222 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 223 help 224 Say Y here if you have a Boca serial board. Please read the Boca 225 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> 226 227 To compile this driver as a module, choose M here: the module 228 will be called 8250_boca. 229 230config SERIAL_8250_EXAR_ST16C554 231 tristate "Support Exar ST16C554/554D Quad UART" 232 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 233 help 234 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are 235 tinkering with your Envoy TU301, or have a machine with this UART, 236 say Y here. 237 238 To compile this driver as a module, choose M here: the module 239 will be called 8250_exar_st16c554. 240 241config SERIAL_8250_HUB6 242 tristate "Support Hub6 cards" 243 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS 244 help 245 Say Y here if you have a HUB6 serial board. 246 247 To compile this driver as a module, choose M here: the module 248 will be called 8250_hub6. 249 250# 251# Misc. options/drivers. 252# 253 254config SERIAL_8250_SHARE_IRQ 255 bool "Support for sharing serial interrupts" 256 depends on SERIAL_8250_EXTENDED 257 help 258 Some serial boards have hardware support which allows multiple dumb 259 serial ports on the same board to share a single IRQ. To enable 260 support for this in the serial driver, say Y here. 261 262config SERIAL_8250_DETECT_IRQ 263 bool "Autodetect IRQ on standard ports (unsafe)" 264 depends on SERIAL_8250_EXTENDED 265 help 266 Say Y here if you want the kernel to try to guess which IRQ 267 to use for your serial port. 268 269 This is considered unsafe; it is far better to configure the IRQ in 270 a boot script using the setserial command. 271 272 If unsure, say N. 273 274config SERIAL_8250_RSA 275 bool "Support RSA serial ports" 276 depends on SERIAL_8250_EXTENDED 277 help 278 Say Y here if you have a IODATA RSA-DV II/S ISA card and 279 would like to use its >115kbps speeds. 280 You will need to provide module parameter "probe_rsa", or boot-time 281 parameter 8250.probe_rsa with I/O addresses of this card then. 282 283 If you don't have such card, or if unsure, say N. 284 285config SERIAL_8250_ACORN 286 tristate "Acorn expansion card serial port support" 287 depends on ARCH_ACORN && SERIAL_8250 288 help 289 If you have an Atomwide Serial card or Serial Port card for an Acorn 290 system, say Y to this option. The driver can handle 1, 2, or 3 port 291 cards. If unsure, say N. 292 293config SERIAL_8250_BCM2835AUX 294 tristate "BCM2835 auxiliar mini UART support" 295 depends on ARCH_BCM2835 || COMPILE_TEST 296 depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ 297 help 298 Support for the BCM2835 auxiliar mini UART. 299 300 Features and limitations of the UART are 301 Registers are similar to 16650 registers, 302 set bits in the control registers that are unsupported 303 are ignored and read back as 0 304 7/8 bit operation with 1 start and 1 stop bit 305 8 symbols deep fifo for rx and tx 306 SW controlled RTS and SW readable CTS 307 Clock rate derived from system clock 308 Uses 8 times oversampling (compared to 16 times for 16650) 309 Missing break detection (but break generation) 310 Missing framing error detection 311 Missing parity bit 312 Missing receive time-out interrupt 313 Missing DCD, DSR, DTR and RI signals 314 315 If unsure, say N. 316 317config SERIAL_8250_FSL 318 bool 319 depends on SERIAL_8250_CONSOLE 320 default PPC || ARM || ARM64 321 322config SERIAL_8250_DW 323 tristate "Support for Synopsys DesignWare 8250 quirks" 324 depends on SERIAL_8250 325 help 326 Selecting this option will enable handling of the extra features 327 present in the Synopsys DesignWare APB UART. 328 329config SERIAL_8250_EM 330 tristate "Support for Emma Mobile integrated serial port" 331 depends on SERIAL_8250 && ARM && HAVE_CLK 332 help 333 Selecting this option will add support for the integrated serial 334 port hardware found on the Emma Mobile line of processors. 335 If unsure, say N. 336 337config SERIAL_8250_RT288X 338 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" 339 depends on SERIAL_8250 340 default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620 341 help 342 Selecting this option will add support for the alternate register 343 layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others. 344 If unsure, say N. 345 346config SERIAL_8250_OMAP 347 tristate "Support for OMAP internal UART (8250 based driver)" 348 depends on SERIAL_8250 && ARCH_OMAP2PLUS 349 help 350 If you have a machine based on an Texas Instruments OMAP CPU you 351 can enable its onboard serial ports by enabling this option. 352 353 This driver uses ttyS instead of ttyO. 354 355config SERIAL_8250_OMAP_TTYO_FIXUP 356 bool "Replace ttyO with ttyS" 357 depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE 358 default y 359 help 360 This option replaces the "console=ttyO" argument with the matching 361 ttyS argument if the user did not specified it on the command line. 362 This ensures that the user can see the kernel output during boot 363 which he wouldn't see otherwise. The getty has still to be configured 364 for ttyS instead of ttyO regardless of this option. 365 This option is intended for people who "automatically" enable this 366 driver without knowing that this driver requires a different console= 367 argument. If you read this, please keep this option disabled and 368 instead update your kernel command line. If you prepare a kernel for a 369 distribution or other kind of larger user base then you probably want 370 to keep this option enabled. Otherwise people might complain about a 371 not booting kernel because the serial console remains silent in case 372 they forgot to update the command line. 373 374config SERIAL_8250_LPC18XX 375 tristate "NXP LPC18xx/43xx serial port support" 376 depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST) 377 default ARCH_LPC18XX 378 help 379 If you have a LPC18xx/43xx based board and want to use the 380 serial port, say Y to this option. If unsure, say Y. 381 382config SERIAL_8250_MT6577 383 tristate "Mediatek serial port support" 384 depends on SERIAL_8250 && ARCH_MEDIATEK 385 help 386 If you have a Mediatek based board and want to use the 387 serial port, say Y to this option. If unsure, say N. 388 389config SERIAL_8250_UNIPHIER 390 tristate "Support for UniPhier on-chip UART" 391 depends on SERIAL_8250 392 depends on ARCH_UNIPHIER || COMPILE_TEST 393 help 394 If you have a UniPhier based board and want to use the on-chip 395 serial ports, say Y to this option. If unsure, say N. 396 397config SERIAL_8250_INGENIC 398 tristate "Support for Ingenic SoC serial ports" 399 depends on SERIAL_8250 400 depends on OF_FLATTREE 401 depends on MIPS || COMPILE_TEST 402 help 403 If you have a system using an Ingenic SoC and wish to make use of 404 its UARTs, say Y to this option. If unsure, say N. 405 406config SERIAL_8250_MID 407 tristate "Support for serial ports on Intel MID platforms" if EXPERT 408 default SERIAL_8250 409 depends on SERIAL_8250 && PCI 410 depends on X86 || COMPILE_TEST 411 select HSU_DMA if SERIAL_8250_DMA 412 select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID) 413 select RATIONAL 414 help 415 Selecting this option will enable handling of the extra features 416 present on the UART found on Intel Medfield SOC and various other 417 Intel platforms. 418 419config SERIAL_8250_MOXA 420 tristate "MOXA SmartIO MUE support" 421 depends on SERIAL_8250 && PCI 422 help 423 Say Y here if you have a Moxa SmartIO MUE multiport serial card. 424 If unsure, say N. 425 426 This driver can also be built as a module. The module will be called 427 8250_moxa. If you want to do that, say M here. 428 429config SERIAL_OF_PLATFORM 430 tristate "Devicetree based probing for 8250 ports" 431 depends on SERIAL_8250 && OF 432 help 433 This option is used for all 8250 compatible serial ports that 434 are probed through devicetree, including Open Firmware based 435 PowerPC systems and embedded systems on architectures using the 436 flattened device tree format. 437