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.
7 tristate "8250/16550 and compatible serial support"
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 and Stallion multi
16 serial port drivers do not need this driver built in for them to
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
26 BTW1: If you have a mouseman serial mouse which is not recognized by
27 the X window system, try running gpm first.
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.
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.
36 config SERIAL_8250_CONSOLE
37 bool "Console on 8250/16550 and compatible serial port"
38 depends on SERIAL_8250=y
39 select SERIAL_CORE_CONSOLE
41 If you say Y here, it will be possible to use a serial port as the
42 system console (the system console is the device which receives all
43 kernel messages and warnings and which allows logins in single user
44 mode). This could be useful if some terminal or printer is connected
47 Even if you say Y here, the currently visible virtual console
48 (/dev/tty0) will still be used as the system console by default, but
49 you can alter that using a kernel command line option such as
50 "console=ttyS1". (Try "man bootparam" or see the documentation of
51 your boot loader (grub or lilo or loadlin) about how to pass options
52 to the kernel at boot time.)
54 If you don't have a VGA card installed and you say Y here, the
55 kernel will automatically use the first serial line, /dev/ttyS0, as
58 You can set that using a kernel command line option such as
59 "console=uart8250,io,0x3f8,9600n8"
60 "console=uart8250,mmio,0xff5e0000,115200n8".
61 and it will switch to normal serial console when the corresponding
63 "earlycon=uart8250,io,0x3f8,9600n8"
64 "earlycon=uart8250,mmio,0xff5e0000,115200n8".
65 it will not only setup early console.
69 config FIX_EARLYCON_MEM
74 config SERIAL_8250_GSC
76 depends on SERIAL_8250 && GSC
79 config SERIAL_8250_PCI
80 tristate "8250/16550 PCI device support" if EXPERT
81 depends on SERIAL_8250 && PCI
84 This builds standard PCI serial support. You may be able to
85 disable this feature if you only need legacy serial support.
88 config SERIAL_8250_PNP
89 tristate "8250/16550 PNP device support" if EXPERT
90 depends on SERIAL_8250 && PNP
93 This builds standard PNP serial support. You may be able to
94 disable this feature if you only need legacy serial support.
96 config SERIAL_8250_HP300
98 depends on SERIAL_8250 && HP300
101 config SERIAL_8250_CS
102 tristate "8250/16550 PCMCIA device support"
103 depends on PCMCIA && SERIAL_8250
105 Say Y here to enable support for 16-bit PCMCIA serial devices,
106 including serial port cards, modems, and the modem functions of
107 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
108 credit-card size devices often used with laptops.)
110 To compile this driver as a module, choose M here: the
111 module will be called serial_cs.
115 config SERIAL_8250_NR_UARTS
116 int "Maximum number of 8250/16550 serial ports"
117 depends on SERIAL_8250
120 Set this to the number of serial ports you want the driver
121 to support. This includes any ports discovered via ACPI or
122 PCI enumeration and any ports that may be added at run-time
123 via hot-plug, or any ISA multi-port serial cards.
125 config SERIAL_8250_RUNTIME_UARTS
126 int "Number of 8250/16550 serial ports to register at runtime"
127 depends on SERIAL_8250
128 range 0 SERIAL_8250_NR_UARTS
131 Set this to the maximum number of serial ports you want
132 the kernel to register at boot time. This can be overridden
133 with the module parameter "nr_uarts", or boot-time parameter
136 config SERIAL_8250_EXTENDED
137 bool "Extended 8250/16550 serial driver options"
138 depends on SERIAL_8250
140 If you wish to use any non-standard features of the standard "dumb"
141 driver, say Y here. This includes HUB6 support, shared serial
142 interrupts, special multiport support, support for more than the
143 four COM 1/2/3/4 boards, etc.
145 Note that the answer to this question won't directly affect the
146 kernel: saying N will just cause the configurator to skip all
147 the questions about serial driver options. If unsure, say N.
149 config SERIAL_8250_MANY_PORTS
150 bool "Support more than 4 legacy serial ports"
151 depends on SERIAL_8250_EXTENDED && !IA64
153 Say Y here if you have dumb serial boards other than the four
154 standard COM 1/2/3/4 ports. This may happen if you have an AST
155 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
156 from <http://www.tldp.org/docs.html#howto>), or other custom
157 serial port hardware which acts similar to standard serial port
158 hardware. If you only use the standard COM 1/2/3/4 ports, you can
159 say N here to save some memory. You can also say Y if you have an
160 "intelligent" multiport card such as Cyclades, Digiboards, etc.
163 # Multi-port serial cards
166 config SERIAL_8250_FOURPORT
167 tristate "Support Fourport cards"
168 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
170 Say Y here if you have an AST FourPort serial board.
172 To compile this driver as a module, choose M here: the module
173 will be called 8250_fourport.
175 config SERIAL_8250_ACCENT
176 tristate "Support Accent cards"
177 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
179 Say Y here if you have an Accent Async serial board.
181 To compile this driver as a module, choose M here: the module
182 will be called 8250_accent.
184 config SERIAL_8250_BOCA
185 tristate "Support Boca cards"
186 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
188 Say Y here if you have a Boca serial board. Please read the Boca
189 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
191 To compile this driver as a module, choose M here: the module
192 will be called 8250_boca.
194 config SERIAL_8250_EXAR_ST16C554
195 tristate "Support Exar ST16C554/554D Quad UART"
196 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
198 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
199 tinkering with your Envoy TU301, or have a machine with this UART,
202 To compile this driver as a module, choose M here: the module
203 will be called 8250_exar_st16c554.
205 config SERIAL_8250_HUB6
206 tristate "Support Hub6 cards"
207 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
209 Say Y here if you have a HUB6 serial board.
211 To compile this driver as a module, choose M here: the module
212 will be called 8250_hub6.
215 # Misc. options/drivers.
218 config SERIAL_8250_SHARE_IRQ
219 bool "Support for sharing serial interrupts"
220 depends on SERIAL_8250_EXTENDED
222 Some serial boards have hardware support which allows multiple dumb
223 serial ports on the same board to share a single IRQ. To enable
224 support for this in the serial driver, say Y here.
226 config SERIAL_8250_DETECT_IRQ
227 bool "Autodetect IRQ on standard ports (unsafe)"
228 depends on SERIAL_8250_EXTENDED
230 Say Y here if you want the kernel to try to guess which IRQ
231 to use for your serial port.
233 This is considered unsafe; it is far better to configure the IRQ in
234 a boot script using the setserial command.
238 config SERIAL_8250_RSA
239 bool "Support RSA serial ports"
240 depends on SERIAL_8250_EXTENDED
242 ::: To be written :::
244 config SERIAL_8250_MCA
245 tristate "Support 8250-type ports on MCA buses"
246 depends on SERIAL_8250 != n && MCA
248 Say Y here if you have a MCA serial ports.
250 To compile this driver as a module, choose M here: the module
251 will be called 8250_mca.
253 config SERIAL_8250_ACORN
254 tristate "Acorn expansion card serial port support"
255 depends on ARCH_ACORN && SERIAL_8250
257 If you have an Atomwide Serial card or Serial Port card for an Acorn
258 system, say Y to this option. The driver can handle 1, 2, or 3 port
259 cards. If unsure, say N.
261 config SERIAL_8250_RM9K
262 bool "Support for MIPS RM9xxx integrated serial port"
263 depends on SERIAL_8250 != n && SERIAL_RM9000
264 select SERIAL_8250_SHARE_IRQ
266 Selecting this option will add support for the integrated serial
267 port hardware found on MIPS RM9122 and similar processors.
270 config SERIAL_8250_FSL
272 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
275 config SERIAL_8250_DW
276 tristate "Support for Synopsys DesignWare 8250 quirks"
277 depends on SERIAL_8250 && OF
279 Selecting this option will enable handling of the extra features
280 present in the Synopsys DesignWare APB UART.