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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_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.
 67           If this option is not selected the device will be configured as a
 68           standard 16550A serial port.
 70           If unsure, say N.
 72 config 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.
 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.)
 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.
 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.
104           If unsure, say N.
106 config SERIAL_8250_GSC
107         tristate
108         depends on SERIAL_8250 && GSC
109         default SERIAL_8250
111 config 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.
119 config SERIAL_8250_PCI
120         tristate "8250/16550 PCI device support" if EXPERT
121         depends on SERIAL_8250 && PCI
122         default SERIAL_8250
123         select RATIONAL
124         help
125           This builds standard PCI serial support. You may be able to
126           disable this feature if you only need legacy serial support.
127           Saves about 9K.
128           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
129           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
131 config SERIAL_8250_HP300
132         tristate
133         depends on SERIAL_8250 && HP300
134         default SERIAL_8250
136 config SERIAL_8250_CS
137         tristate "8250/16550 PCMCIA device support"
138         depends on PCMCIA && SERIAL_8250
139         ---help---
140           Say Y here to enable support for 16-bit PCMCIA serial devices,
141           including serial port cards, modems, and the modem functions of
142           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
143           credit-card size devices often used with laptops.)
145           To compile this driver as a module, choose M here: the
146           module will be called serial_cs.
148           If unsure, say N.
150 config SERIAL_8250_NR_UARTS
151         int "Maximum number of 8250/16550 serial ports"
152         depends on SERIAL_8250
153         default "4"
154         help
155           Set this to the number of serial ports you want the driver
156           to support.  This includes any ports discovered via ACPI or
157           PCI enumeration and any ports that may be added at run-time
158           via hot-plug, or any ISA multi-port serial cards.
160 config SERIAL_8250_RUNTIME_UARTS
161         int "Number of 8250/16550 serial ports to register at runtime"
162         depends on SERIAL_8250
163         range 0 SERIAL_8250_NR_UARTS
164         default "4"
165         help
166           Set this to the maximum number of serial ports you want
167           the kernel to register at boot time.  This can be overridden
168           with the module parameter "nr_uarts", or boot-time parameter
169           8250.nr_uarts
171 config SERIAL_8250_EXTENDED
172         bool "Extended 8250/16550 serial driver options"
173         depends on SERIAL_8250
174         help
175           If you wish to use any non-standard features of the standard "dumb"
176           driver, say Y here. This includes HUB6 support, shared serial
177           interrupts, special multiport support, support for more than the
178           four COM 1/2/3/4 boards, etc.
180           Note that the answer to this question won't directly affect the
181           kernel: saying N will just cause the configurator to skip all
182           the questions about serial driver options. If unsure, say N.
184 config SERIAL_8250_MANY_PORTS
185         bool "Support more than 4 legacy serial ports"
186         depends on SERIAL_8250_EXTENDED && !IA64
187         help
188           Say Y here if you have dumb serial boards other than the four
189           standard COM 1/2/3/4 ports. This may happen if you have an AST
190           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
191           from <>), or other custom
192           serial port hardware which acts similar to standard serial port
193           hardware. If you only use the standard COM 1/2/3/4 ports, you can
194           say N here to save some memory. You can also say Y if you have an
195           "intelligent" multiport card such as Cyclades, Digiboards, etc.
197 #
198 # Multi-port serial cards
199 #
201 config SERIAL_8250_FOURPORT
202         tristate "Support Fourport cards"
203         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
204         help
205           Say Y here if you have an AST FourPort serial board.
207           To compile this driver as a module, choose M here: the module
208           will be called 8250_fourport.
210 config SERIAL_8250_ACCENT
211         tristate "Support Accent cards"
212         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
213         help
214           Say Y here if you have an Accent Async serial board.
216           To compile this driver as a module, choose M here: the module
217           will be called 8250_accent.
219 config SERIAL_8250_BOCA
220         tristate "Support Boca cards"
221         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
222         help
223           Say Y here if you have a Boca serial board.  Please read the Boca
224           mini-HOWTO, available from <>
226           To compile this driver as a module, choose M here: the module
227           will be called 8250_boca.
229 config SERIAL_8250_EXAR_ST16C554
230         tristate "Support Exar ST16C554/554D Quad UART"
231         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
232         help
233           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
234           tinkering with your Envoy TU301, or have a machine with this UART,
235           say Y here.
237           To compile this driver as a module, choose M here: the module
238           will be called 8250_exar_st16c554.
240 config SERIAL_8250_HUB6
241         tristate "Support Hub6 cards"
242         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
243         help
244           Say Y here if you have a HUB6 serial board.
246           To compile this driver as a module, choose M here: the module
247           will be called 8250_hub6.
249 #
250 # Misc. options/drivers.
251 #
253 config SERIAL_8250_SHARE_IRQ
254         bool "Support for sharing serial interrupts"
255         depends on SERIAL_8250_EXTENDED
256         help
257           Some serial boards have hardware support which allows multiple dumb
258           serial ports on the same board to share a single IRQ. To enable
259           support for this in the serial driver, say Y here.
261 config SERIAL_8250_DETECT_IRQ
262         bool "Autodetect IRQ on standard ports (unsafe)"
263         depends on SERIAL_8250_EXTENDED
264         help
265           Say Y here if you want the kernel to try to guess which IRQ
266           to use for your serial port.
268           This is considered unsafe; it is far better to configure the IRQ in
269           a boot script using the setserial command.
271           If unsure, say N.
273 config SERIAL_8250_RSA
274         bool "Support RSA serial ports"
275         depends on SERIAL_8250_EXTENDED
276         help
277           Say Y here if you have a IODATA RSA-DV II/S ISA card and
278           would like to use its >115kbps speeds.
279           You will need to provide module parameter "probe_rsa", or boot-time
280           parameter 8250.probe_rsa with I/O addresses of this card then.
282           If you don't have such card, or if unsure, say N.
284 config SERIAL_8250_ACORN
285         tristate "Acorn expansion card serial port support"
286         depends on ARCH_ACORN && SERIAL_8250
287         help
288           If you have an Atomwide Serial card or Serial Port card for an Acorn
289           system, say Y to this option.  The driver can handle 1, 2, or 3 port
290           cards.  If unsure, say N.
292 config SERIAL_8250_BCM2835AUX
293         tristate "BCM2835 auxiliar mini UART support"
294         depends on ARCH_BCM2835 || COMPILE_TEST
295         depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
296         help
297           Support for the BCM2835 auxiliar mini UART.
299           Features and limitations of the UART are
300             Registers are similar to 16650 registers,
301               set bits in the control registers that are unsupported
302               are ignored and read back as 0
303             7/8 bit operation with 1 start and 1 stop bit
304             8 symbols deep fifo for rx and tx
305             SW controlled RTS and SW readable CTS
306             Clock rate derived from system clock
307             Uses 8 times oversampling (compared to 16 times for 16650)
308             Missing break detection (but break generation)
309             Missing framing error detection
310             Missing parity bit
311             Missing receive time-out interrupt
312             Missing DCD, DSR, DTR and RI signals
314           If unsure, say N.
316 config SERIAL_8250_FSL
317         bool
318         depends on SERIAL_8250_CONSOLE
319         default PPC || ARM || ARM64
321 config SERIAL_8250_DW
322         tristate "Support for Synopsys DesignWare 8250 quirks"
323         depends on SERIAL_8250
324         help
325           Selecting this option will enable handling of the extra features
326           present in the Synopsys DesignWare APB UART.
328 config SERIAL_8250_EM
329         tristate "Support for Emma Mobile integrated serial port"
330         depends on SERIAL_8250 && ARM && HAVE_CLK
331         help
332           Selecting this option will add support for the integrated serial
333           port hardware found on the Emma Mobile line of processors.
334           If unsure, say N.
336 config SERIAL_8250_RT288X
337         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
338         depends on SERIAL_8250
339         default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
340         help
341           Selecting this option will add support for the alternate register
342           layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
343           If unsure, say N.
345 config SERIAL_8250_OMAP
346         tristate "Support for OMAP internal UART (8250 based driver)"
347         depends on SERIAL_8250 && ARCH_OMAP2PLUS
348         help
349           If you have a machine based on an Texas Instruments OMAP CPU you
350           can enable its onboard serial ports by enabling this option.
352           This driver uses ttyS instead of ttyO.
354 config SERIAL_8250_OMAP_TTYO_FIXUP
355         bool "Replace ttyO with ttyS"
356         depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
357         default y
358         help
359           This option replaces the "console=ttyO" argument with the matching
360           ttyS argument if the user did not specified it on the command line.
361           This ensures that the user can see the kernel output during boot
362           which he wouldn't see otherwise. The getty has still to be configured
363           for ttyS instead of ttyO regardless of this option.
364           This option is intended for people who "automatically" enable this
365           driver without knowing that this driver requires a different console=
366           argument. If you read this, please keep this option disabled and
367           instead update your kernel command line. If you prepare a kernel for a
368           distribution or other kind of larger user base then you probably want
369           to keep this option enabled. Otherwise people might complain about a
370           not booting kernel because the serial console remains silent in case
371           they forgot to update the command line.
373 config SERIAL_8250_LPC18XX
374         tristate "NXP LPC18xx/43xx serial port support"
375         depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
376         default ARCH_LPC18XX
377         help
378           If you have a LPC18xx/43xx based board and want to use the
379           serial port, say Y to this option. If unsure, say Y.
381 config SERIAL_8250_MT6577
382         tristate "Mediatek serial port support"
383         depends on SERIAL_8250 && ARCH_MEDIATEK
384         help
385           If you have a Mediatek based board and want to use the
386           serial port, say Y to this option. If unsure, say N.
388 config SERIAL_8250_UNIPHIER
389         tristate "Support for UniPhier on-chip UART"
390         depends on SERIAL_8250
391         depends on ARCH_UNIPHIER || COMPILE_TEST
392         help
393           If you have a UniPhier based board and want to use the on-chip
394           serial ports, say Y to this option. If unsure, say N.
396 config SERIAL_8250_INGENIC
397         tristate "Support for Ingenic SoC serial ports"
398         depends on SERIAL_8250
399         depends on OF_FLATTREE
400         depends on MIPS || COMPILE_TEST
401         help
402           If you have a system using an Ingenic SoC and wish to make use of
403           its UARTs, say Y to this option. If unsure, say N.
405 config SERIAL_8250_MID
406         tristate "Support for serial ports on Intel MID platforms" if EXPERT
407         default SERIAL_8250
408         depends on SERIAL_8250 && PCI
409         depends on X86 || COMPILE_TEST
410         select HSU_DMA if SERIAL_8250_DMA
411         select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
412         select RATIONAL
413         help
414           Selecting this option will enable handling of the extra features
415           present on the UART found on Intel Medfield SOC and various other
416           Intel platforms.
418 config SERIAL_8250_MOXA
419         tristate "MOXA SmartIO MUE support"
420         depends on SERIAL_8250 && PCI
421         help
422           Say Y here if you have a Moxa SmartIO MUE multiport serial card.
423           If unsure, say N.
425           This driver can also be built as a module. The module will be called
426           8250_moxa. If you want to do that, say M here.
429         tristate "Devicetree based probing for 8250 ports"
430         depends on SERIAL_8250 && OF
431         help
432           This option is used for all 8250 compatible serial ports that
433           are probed through devicetree, including Open Firmware based
434           PowerPC systems and embedded systems on architectures using the
435           flattened device tree format.

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