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Linux/drivers/tty/serial/8250/Kconfig

  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 
  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.)
 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 
 35 config 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 
 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.
 59 
 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         ---help---
 65           If you say Y here, it will be possible to use a serial port as the
 66           system console (the system console is the device which receives all
 67           kernel messages and warnings and which allows logins in single user
 68           mode). This could be useful if some terminal or printer is connected
 69           to that serial port.
 70 
 71           Even if you say Y here, the currently visible virtual console
 72           (/dev/tty0) will still be used as the system console by default, but
 73           you can alter that using a kernel command line option such as
 74           "console=ttyS1". (Try "man bootparam" or see the documentation of
 75           your boot loader (grub or lilo or loadlin) about how to pass options
 76           to the kernel at boot time.)
 77 
 78           If you don't have a VGA card installed and you say Y here, the
 79           kernel will automatically use the first serial line, /dev/ttyS0, as
 80           system console.
 81 
 82           You can set that using a kernel command line option such as
 83           "console=uart8250,io,0x3f8,9600n8"
 84           "console=uart8250,mmio,0xff5e0000,115200n8".
 85           and it will switch to normal serial console when the corresponding
 86           port is ready.
 87           "earlycon=uart8250,io,0x3f8,9600n8"
 88           "earlycon=uart8250,mmio,0xff5e0000,115200n8".
 89           it will not only setup early console.
 90 
 91           If unsure, say N.
 92 
 93 config FIX_EARLYCON_MEM
 94         bool
 95         depends on X86
 96         default y
 97 
 98 config SERIAL_8250_GSC
 99         tristate
100         depends on SERIAL_8250 && GSC
101         default SERIAL_8250
102 
103 config SERIAL_8250_DMA
104         bool "DMA support for 16550 compatible UART controllers" if EXPERT
105         depends on SERIAL_8250 && DMADEVICES=y
106         default SERIAL_8250
107         help
108           This builds DMA support that can be used with 8250/16650
109           compatible UART controllers that support DMA signaling.
110 
111 config SERIAL_8250_PCI
112         tristate "8250/16550 PCI device support" if EXPERT
113         depends on SERIAL_8250 && PCI
114         default SERIAL_8250
115         help
116           This builds standard PCI serial support. You may be able to
117           disable this feature if you only need legacy serial support.
118           Saves about 9K.
119           Note that serial ports on NetMos 9835 Multi-I/O cards are handled
120           by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
121 
122 config SERIAL_8250_HP300
123         tristate
124         depends on SERIAL_8250 && HP300
125         default SERIAL_8250
126 
127 config SERIAL_8250_CS
128         tristate "8250/16550 PCMCIA device support"
129         depends on PCMCIA && SERIAL_8250
130         ---help---
131           Say Y here to enable support for 16-bit PCMCIA serial devices,
132           including serial port cards, modems, and the modem functions of
133           multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
134           credit-card size devices often used with laptops.)
135 
136           To compile this driver as a module, choose M here: the
137           module will be called serial_cs.
138 
139           If unsure, say N.
140 
141 config SERIAL_8250_NR_UARTS
142         int "Maximum number of 8250/16550 serial ports"
143         depends on SERIAL_8250
144         default "4"
145         help
146           Set this to the number of serial ports you want the driver
147           to support.  This includes any ports discovered via ACPI or
148           PCI enumeration and any ports that may be added at run-time
149           via hot-plug, or any ISA multi-port serial cards.
150 
151 config SERIAL_8250_RUNTIME_UARTS
152         int "Number of 8250/16550 serial ports to register at runtime"
153         depends on SERIAL_8250
154         range 0 SERIAL_8250_NR_UARTS
155         default "4"
156         help
157           Set this to the maximum number of serial ports you want
158           the kernel to register at boot time.  This can be overridden
159           with the module parameter "nr_uarts", or boot-time parameter
160           8250.nr_uarts
161 
162 config SERIAL_8250_EXTENDED
163         bool "Extended 8250/16550 serial driver options"
164         depends on SERIAL_8250
165         help
166           If you wish to use any non-standard features of the standard "dumb"
167           driver, say Y here. This includes HUB6 support, shared serial
168           interrupts, special multiport support, support for more than the
169           four COM 1/2/3/4 boards, etc.
170 
171           Note that the answer to this question won't directly affect the
172           kernel: saying N will just cause the configurator to skip all
173           the questions about serial driver options. If unsure, say N.
174 
175 config SERIAL_8250_MANY_PORTS
176         bool "Support more than 4 legacy serial ports"
177         depends on SERIAL_8250_EXTENDED && !IA64
178         help
179           Say Y here if you have dumb serial boards other than the four
180           standard COM 1/2/3/4 ports. This may happen if you have an AST
181           FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
182           from <http://www.tldp.org/docs.html#howto>), or other custom
183           serial port hardware which acts similar to standard serial port
184           hardware. If you only use the standard COM 1/2/3/4 ports, you can
185           say N here to save some memory. You can also say Y if you have an
186           "intelligent" multiport card such as Cyclades, Digiboards, etc.
187 
188 #
189 # Multi-port serial cards
190 #
191 
192 config SERIAL_8250_FOURPORT
193         tristate "Support Fourport cards"
194         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
195         help
196           Say Y here if you have an AST FourPort serial board.
197 
198           To compile this driver as a module, choose M here: the module
199           will be called 8250_fourport.
200 
201 config SERIAL_8250_ACCENT
202         tristate "Support Accent cards"
203         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
204         help
205           Say Y here if you have an Accent Async serial board.
206 
207           To compile this driver as a module, choose M here: the module
208           will be called 8250_accent.
209 
210 config SERIAL_8250_BOCA
211         tristate "Support Boca cards"
212         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
213         help
214           Say Y here if you have a Boca serial board.  Please read the Boca
215           mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
216 
217           To compile this driver as a module, choose M here: the module
218           will be called 8250_boca.
219 
220 config SERIAL_8250_EXAR_ST16C554
221         tristate "Support Exar ST16C554/554D Quad UART"
222         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
223         help
224           The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
225           tinkering with your Envoy TU301, or have a machine with this UART,
226           say Y here.
227 
228           To compile this driver as a module, choose M here: the module
229           will be called 8250_exar_st16c554.
230 
231 config SERIAL_8250_HUB6
232         tristate "Support Hub6 cards"
233         depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
234         help
235           Say Y here if you have a HUB6 serial board.
236 
237           To compile this driver as a module, choose M here: the module
238           will be called 8250_hub6.
239 
240 #
241 # Misc. options/drivers.
242 #
243 
244 config SERIAL_8250_SHARE_IRQ
245         bool "Support for sharing serial interrupts"
246         depends on SERIAL_8250_EXTENDED
247         help
248           Some serial boards have hardware support which allows multiple dumb
249           serial ports on the same board to share a single IRQ. To enable
250           support for this in the serial driver, say Y here.
251 
252 config SERIAL_8250_DETECT_IRQ
253         bool "Autodetect IRQ on standard ports (unsafe)"
254         depends on SERIAL_8250_EXTENDED
255         help
256           Say Y here if you want the kernel to try to guess which IRQ
257           to use for your serial port.
258 
259           This is considered unsafe; it is far better to configure the IRQ in
260           a boot script using the setserial command.
261 
262           If unsure, say N.
263 
264 config SERIAL_8250_RSA
265         bool "Support RSA serial ports"
266         depends on SERIAL_8250_EXTENDED
267         help
268           ::: To be written :::
269 
270 config SERIAL_8250_ACORN
271         tristate "Acorn expansion card serial port support"
272         depends on ARCH_ACORN && SERIAL_8250
273         help
274           If you have an Atomwide Serial card or Serial Port card for an Acorn
275           system, say Y to this option.  The driver can handle 1, 2, or 3 port
276           cards.  If unsure, say N.
277 
278 config SERIAL_8250_FSL
279         bool
280         depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
281         default PPC
282 
283 config SERIAL_8250_DW
284         tristate "Support for Synopsys DesignWare 8250 quirks"
285         depends on SERIAL_8250
286         help
287           Selecting this option will enable handling of the extra features
288           present in the Synopsys DesignWare APB UART.
289 
290 config SERIAL_8250_EM
291         tristate "Support for Emma Mobile integrated serial port"
292         depends on SERIAL_8250 && ARM && HAVE_CLK
293         help
294           Selecting this option will add support for the integrated serial
295           port hardware found on the Emma Mobile line of processors.
296           If unsure, say N.
297 
298 config SERIAL_8250_RT288X
299         bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
300         depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
301         help
302           If you have a Ralink RT288x/RT305x SoC based board and want to use the
303           serial port, say Y to this option. The driver can handle up to 2 serial
304           ports. If unsure, say N.

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