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  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 #
  6 config 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.)
 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.]
 25           BTW1: If you have a mouseman serial mouse which is not recognized by
 26           the X window system, try running gpm first.
 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.
 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.
 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.
 47           If 8250 is built as a module, this adds 8250_core alias instead. 
 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.
 52 config 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.
 60 config 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.
 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.)
 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.
 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.
 92           If unsure, say N.
 94 config SERIAL_8250_GSC
 95         tristate
 96         depends on SERIAL_8250 && GSC
 97         default SERIAL_8250
 99 config 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.
107 config 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.
119 config SERIAL_8250_HP300
120         tristate
121         depends on SERIAL_8250 && HP300
122         default SERIAL_8250
124 config 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.)
133           To compile this driver as a module, choose M here: the
134           module will be called serial_cs.
136           If unsure, say N.
138 config 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.
148 config 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
159 config 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.
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.
172 config 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 <>), 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.
185 #
186 # Multi-port serial cards
187 #
189 config 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.
195           To compile this driver as a module, choose M here: the module
196           will be called 8250_fourport.
198 config 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.
204           To compile this driver as a module, choose M here: the module
205           will be called 8250_accent.
207 config 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 <>
214           To compile this driver as a module, choose M here: the module
215           will be called 8250_boca.
217 config 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.
225           To compile this driver as a module, choose M here: the module
226           will be called 8250_exar_st16c554.
228 config 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.
234           To compile this driver as a module, choose M here: the module
235           will be called 8250_hub6.
237 #
238 # Misc. options/drivers.
239 #
241 config 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.
249 config 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.
256           This is considered unsafe; it is far better to configure the IRQ in
257           a boot script using the setserial command.
259           If unsure, say N.
261 config 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.
270           If you don't have such card, or if unsure, say N.
272 config 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.
280 config 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.
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
302           If unsure, say N.
304 config SERIAL_8250_FSL
305         bool
306         depends on SERIAL_8250_CONSOLE
307         default PPC || ARM || ARM64
309 config 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.
316 config 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.
324 config 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.
333 config 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.
340           This driver uses ttyS instead of ttyO.
342 config 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.
361 config 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.
369 config 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.
377 config 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.
384 config 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.
391 config 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.
400 config 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.
411 config 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.
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.
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.

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