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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         help
112           This builds standard PCI serial support. You may be able to
113           disable this feature if you only need legacy serial support.
114           Saves about 9K.
115           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
116           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
118 config SERIAL_8250_HP300
119         tristate
120         depends on SERIAL_8250 && HP300
121         default SERIAL_8250
123 config SERIAL_8250_CS
124         tristate "8250/16550 PCMCIA device support"
125         depends on PCMCIA && SERIAL_8250
126         ---help---
127           Say Y here to enable support for 16-bit PCMCIA serial devices,
128           including serial port cards, modems, and the modem functions of
129           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
130           credit-card size devices often used with laptops.)
132           To compile this driver as a module, choose M here: the
133           module will be called serial_cs.
135           If unsure, say N.
137 config SERIAL_8250_NR_UARTS
138         int "Maximum number of 8250/16550 serial ports"
139         depends on SERIAL_8250
140         default "4"
141         help
142           Set this to the number of serial ports you want the driver
143           to support.  This includes any ports discovered via ACPI or
144           PCI enumeration and any ports that may be added at run-time
145           via hot-plug, or any ISA multi-port serial cards.
147 config SERIAL_8250_RUNTIME_UARTS
148         int "Number of 8250/16550 serial ports to register at runtime"
149         depends on SERIAL_8250
150         range 0 SERIAL_8250_NR_UARTS
151         default "4"
152         help
153           Set this to the maximum number of serial ports you want
154           the kernel to register at boot time.  This can be overridden
155           with the module parameter "nr_uarts", or boot-time parameter
156           8250.nr_uarts
158 config SERIAL_8250_EXTENDED
159         bool "Extended 8250/16550 serial driver options"
160         depends on SERIAL_8250
161         help
162           If you wish to use any non-standard features of the standard "dumb"
163           driver, say Y here. This includes HUB6 support, shared serial
164           interrupts, special multiport support, support for more than the
165           four COM 1/2/3/4 boards, etc.
167           Note that the answer to this question won't directly affect the
168           kernel: saying N will just cause the configurator to skip all
169           the questions about serial driver options. If unsure, say N.
171 config SERIAL_8250_MANY_PORTS
172         bool "Support more than 4 legacy serial ports"
173         depends on SERIAL_8250_EXTENDED && !IA64
174         help
175           Say Y here if you have dumb serial boards other than the four
176           standard COM 1/2/3/4 ports. This may happen if you have an AST
177           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
178           from <>), or other custom
179           serial port hardware which acts similar to standard serial port
180           hardware. If you only use the standard COM 1/2/3/4 ports, you can
181           say N here to save some memory. You can also say Y if you have an
182           "intelligent" multiport card such as Cyclades, Digiboards, etc.
184 #
185 # Multi-port serial cards
186 #
188 config SERIAL_8250_FOURPORT
189         tristate "Support Fourport cards"
190         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
191         help
192           Say Y here if you have an AST FourPort serial board.
194           To compile this driver as a module, choose M here: the module
195           will be called 8250_fourport.
197 config SERIAL_8250_ACCENT
198         tristate "Support Accent cards"
199         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
200         help
201           Say Y here if you have an Accent Async serial board.
203           To compile this driver as a module, choose M here: the module
204           will be called 8250_accent.
206 config SERIAL_8250_BOCA
207         tristate "Support Boca cards"
208         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
209         help
210           Say Y here if you have a Boca serial board.  Please read the Boca
211           mini-HOWTO, available from <>
213           To compile this driver as a module, choose M here: the module
214           will be called 8250_boca.
216 config SERIAL_8250_EXAR_ST16C554
217         tristate "Support Exar ST16C554/554D Quad UART"
218         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
219         help
220           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
221           tinkering with your Envoy TU301, or have a machine with this UART,
222           say Y here.
224           To compile this driver as a module, choose M here: the module
225           will be called 8250_exar_st16c554.
227 config SERIAL_8250_HUB6
228         tristate "Support Hub6 cards"
229         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
230         help
231           Say Y here if you have a HUB6 serial board.
233           To compile this driver as a module, choose M here: the module
234           will be called 8250_hub6.
236 #
237 # Misc. options/drivers.
238 #
240 config SERIAL_8250_SHARE_IRQ
241         bool "Support for sharing serial interrupts"
242         depends on SERIAL_8250_EXTENDED
243         help
244           Some serial boards have hardware support which allows multiple dumb
245           serial ports on the same board to share a single IRQ. To enable
246           support for this in the serial driver, say Y here.
248 config SERIAL_8250_DETECT_IRQ
249         bool "Autodetect IRQ on standard ports (unsafe)"
250         depends on SERIAL_8250_EXTENDED
251         help
252           Say Y here if you want the kernel to try to guess which IRQ
253           to use for your serial port.
255           This is considered unsafe; it is far better to configure the IRQ in
256           a boot script using the setserial command.
258           If unsure, say N.
260 config SERIAL_8250_RSA
261         bool "Support RSA serial ports"
262         depends on SERIAL_8250_EXTENDED
263         help
264           ::: To be written :::
266 config SERIAL_8250_ACORN
267         tristate "Acorn expansion card serial port support"
268         depends on ARCH_ACORN && SERIAL_8250
269         help
270           If you have an Atomwide Serial card or Serial Port card for an Acorn
271           system, say Y to this option.  The driver can handle 1, 2, or 3 port
272           cards.  If unsure, say N.
274 config SERIAL_8250_FSL
275         bool
276         depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
277         default PPC
279 config SERIAL_8250_DW
280         tristate "Support for Synopsys DesignWare 8250 quirks"
281         depends on SERIAL_8250
282         help
283           Selecting this option will enable handling of the extra features
284           present in the Synopsys DesignWare APB UART.
286 config SERIAL_8250_EM
287         tristate "Support for Emma Mobile integrated serial port"
288         depends on SERIAL_8250 && ARM && HAVE_CLK
289         help
290           Selecting this option will add support for the integrated serial
291           port hardware found on the Emma Mobile line of processors.
292           If unsure, say N.
294 config SERIAL_8250_RT288X
295         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
296         depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620)
297         help
298           If you have a Ralink RT288x/RT305x SoC based board and want to use the
299           serial port, say Y to this option. The driver can handle up to 2 serial
300           ports. If unsure, say N.
302 config SERIAL_8250_OMAP
303         tristate "Support for OMAP internal UART (8250 based driver)"
304         depends on SERIAL_8250 && ARCH_OMAP2PLUS
305         help
306           If you have a machine based on an Texas Instruments OMAP CPU you
307           can enable its onboard serial ports by enabling this option.
309           This driver uses ttyS instead of ttyO.
311 config SERIAL_8250_OMAP_TTYO_FIXUP
312         bool "Replace ttyO with ttyS"
313         depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
314         default y
315         help
316           This option replaces the "console=ttyO" argument with the matching
317           ttyS argument if the user did not specified it on the command line.
318           This ensures that the user can see the kernel output during boot
319           which he wouldn't see otherwise. The getty has still to be configured
320           for ttyS instead of ttyO regardless of this option.
321           This option is intended for people who "automatically" enable this
322           driver without knowing that this driver requires a different console=
323           argument. If you read this, please keep this option disabled and
324           instead update your kernel command line. If you prepare a kernel for a
325           distribution or other kind of larger user base then you probably want
326           to keep this option enabled. Otherwise people might complain about a
327           not booting kernel because the serial console remains silent in case
328           they forgot to update the command line.
330 config SERIAL_8250_FINTEK
331         tristate "Support for Fintek F81216A LPC to 4 UART"
332         depends on SERIAL_8250 && PNP
333         help
334           Selecting this option will add support for the Fintek F81216A
335           LPC to 4 UART. This device has some RS485 functionality not available
336           through the PNP driver. If unsure, say N.
338 config SERIAL_8250_MT6577
339         bool "Mediatek serial port support"
340         depends on SERIAL_8250 && ARCH_MEDIATEK
341         help
342           If you have a Mediatek based board and want to use the
343           serial port, say Y to this option. If unsure, say N.

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