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"
8 depends on !XEN_DISABLE_SERIAL
11 This selects whether you want to include the driver for the standard
12 serial ports. The standard answer is Y. People who might say N
13 here are those that are setting up dedicated Ethernet WWW/FTP
14 servers, or users that have one of the various bus mice instead of a
15 serial mouse and don't intend to use their machine's standard serial
16 port for anything. (Note that the Cyclades and Stallion multi
17 serial port drivers do not need this driver built in for them to
20 To compile this driver as a module, choose M here: the
21 module will be called 8250.
22 [WARNING: Do not compile this driver as a module if you are using
23 non-standard serial ports, since the configuration information will
24 be lost when the driver is unloaded. This limitation may be lifted
27 BTW1: If you have a mouseman serial mouse which is not recognized by
28 the X window system, try running gpm first.
30 BTW2: If you intend to use a software modem (also called Winmodem)
31 under Linux, forget it. These modems are crippled and require
32 proprietary drivers which are only available under Windows.
34 Most people will say Y or M here, so that they can use serial mice,
35 modems and similar devices connecting to the standard serial ports.
37 config SERIAL_8250_CONSOLE
38 bool "Console on 8250/16550 and compatible serial port"
39 depends on SERIAL_8250=y
40 select SERIAL_CORE_CONSOLE
42 If you say Y here, it will be possible to use a serial port as the
43 system console (the system console is the device which receives all
44 kernel messages and warnings and which allows logins in single user
45 mode). This could be useful if some terminal or printer is connected
48 Even if you say Y here, the currently visible virtual console
49 (/dev/tty0) will still be used as the system console by default, but
50 you can alter that using a kernel command line option such as
51 "console=ttyS1". (Try "man bootparam" or see the documentation of
52 your boot loader (grub or lilo or loadlin) about how to pass options
53 to the kernel at boot time.)
55 If you don't have a VGA card installed and you say Y here, the
56 kernel will automatically use the first serial line, /dev/ttyS0, as
59 You can set that using a kernel command line option such as
60 "console=uart8250,io,0x3f8,9600n8"
61 "console=uart8250,mmio,0xff5e0000,115200n8".
62 and it will switch to normal serial console when the corresponding
64 "earlycon=uart8250,io,0x3f8,9600n8"
65 "earlycon=uart8250,mmio,0xff5e0000,115200n8".
66 it will not only setup early console.
70 config FIX_EARLYCON_MEM
75 config SERIAL_8250_GSC
77 depends on SERIAL_8250 && GSC
80 config SERIAL_8250_PCI
81 tristate "8250/16550 PCI device support" if EXPERT
82 depends on SERIAL_8250 && PCI
85 This builds standard PCI serial support. You may be able to
86 disable this feature if you only need legacy serial support.
89 config SERIAL_8250_PNP
90 tristate "8250/16550 PNP device support" if EXPERT
91 depends on SERIAL_8250 && PNP
94 This builds standard PNP serial support. You may be able to
95 disable this feature if you only need legacy serial support.
97 config SERIAL_8250_HP300
99 depends on SERIAL_8250 && HP300
102 config SERIAL_8250_CS
103 tristate "8250/16550 PCMCIA device support"
104 depends on PCMCIA && SERIAL_8250
106 Say Y here to enable support for 16-bit PCMCIA serial devices,
107 including serial port cards, modems, and the modem functions of
108 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
109 credit-card size devices often used with laptops.)
111 To compile this driver as a module, choose M here: the
112 module will be called serial_cs.
116 config SERIAL_8250_NR_UARTS
117 int "Maximum number of 8250/16550 serial ports"
118 depends on SERIAL_8250
121 Set this to the number of serial ports you want the driver
122 to support. This includes any ports discovered via ACPI or
123 PCI enumeration and any ports that may be added at run-time
124 via hot-plug, or any ISA multi-port serial cards.
126 config SERIAL_8250_RUNTIME_UARTS
127 int "Number of 8250/16550 serial ports to register at runtime"
128 depends on SERIAL_8250
129 range 0 SERIAL_8250_NR_UARTS
132 Set this to the maximum number of serial ports you want
133 the kernel to register at boot time. This can be overridden
134 with the module parameter "nr_uarts", or boot-time parameter
137 config SERIAL_8250_EXTENDED
138 bool "Extended 8250/16550 serial driver options"
139 depends on SERIAL_8250
141 If you wish to use any non-standard features of the standard "dumb"
142 driver, say Y here. This includes HUB6 support, shared serial
143 interrupts, special multiport support, support for more than the
144 four COM 1/2/3/4 boards, etc.
146 Note that the answer to this question won't directly affect the
147 kernel: saying N will just cause the configurator to skip all
148 the questions about serial driver options. If unsure, say N.
150 config SERIAL_8250_MANY_PORTS
151 bool "Support more than 4 legacy serial ports"
152 depends on SERIAL_8250_EXTENDED && !IA64
154 Say Y here if you have dumb serial boards other than the four
155 standard COM 1/2/3/4 ports. This may happen if you have an AST
156 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
157 from <http://www.tldp.org/docs.html#howto>), or other custom
158 serial port hardware which acts similar to standard serial port
159 hardware. If you only use the standard COM 1/2/3/4 ports, you can
160 say N here to save some memory. You can also say Y if you have an
161 "intelligent" multiport card such as Cyclades, Digiboards, etc.
164 # Multi-port serial cards
167 config SERIAL_8250_FOURPORT
168 tristate "Support Fourport cards"
169 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
171 Say Y here if you have an AST FourPort serial board.
173 To compile this driver as a module, choose M here: the module
174 will be called 8250_fourport.
176 config SERIAL_8250_ACCENT
177 tristate "Support Accent cards"
178 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
180 Say Y here if you have an Accent Async serial board.
182 To compile this driver as a module, choose M here: the module
183 will be called 8250_accent.
185 config SERIAL_8250_BOCA
186 tristate "Support Boca cards"
187 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
189 Say Y here if you have a Boca serial board. Please read the Boca
190 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
192 To compile this driver as a module, choose M here: the module
193 will be called 8250_boca.
195 config SERIAL_8250_EXAR_ST16C554
196 tristate "Support Exar ST16C554/554D Quad UART"
197 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
199 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
200 tinkering with your Envoy TU301, or have a machine with this UART,
203 To compile this driver as a module, choose M here: the module
204 will be called 8250_exar_st16c554.
206 config SERIAL_8250_HUB6
207 tristate "Support Hub6 cards"
208 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
210 Say Y here if you have a HUB6 serial board.
212 To compile this driver as a module, choose M here: the module
213 will be called 8250_hub6.
216 # Misc. options/drivers.
219 config SERIAL_8250_SHARE_IRQ
220 bool "Support for sharing serial interrupts"
221 depends on SERIAL_8250_EXTENDED
223 Some serial boards have hardware support which allows multiple dumb
224 serial ports on the same board to share a single IRQ. To enable
225 support for this in the serial driver, say Y here.
227 config SERIAL_8250_DETECT_IRQ
228 bool "Autodetect IRQ on standard ports (unsafe)"
229 depends on SERIAL_8250_EXTENDED
231 Say Y here if you want the kernel to try to guess which IRQ
232 to use for your serial port.
234 This is considered unsafe; it is far better to configure the IRQ in
235 a boot script using the setserial command.
239 config SERIAL_8250_RSA
240 bool "Support RSA serial ports"
241 depends on SERIAL_8250_EXTENDED
243 ::: To be written :::
245 config SERIAL_8250_MCA
246 tristate "Support 8250-type ports on MCA buses"
247 depends on SERIAL_8250 != n && MCA
249 Say Y here if you have a MCA serial ports.
251 To compile this driver as a module, choose M here: the module
252 will be called 8250_mca.
254 config SERIAL_8250_ACORN
255 tristate "Acorn expansion card serial port support"
256 depends on ARCH_ACORN && SERIAL_8250
258 If you have an Atomwide Serial card or Serial Port card for an Acorn
259 system, say Y to this option. The driver can handle 1, 2, or 3 port
260 cards. If unsure, say N.
262 config SERIAL_8250_RM9K
263 bool "Support for MIPS RM9xxx integrated serial port"
264 depends on SERIAL_8250 != n && SERIAL_RM9000
265 select SERIAL_8250_SHARE_IRQ
267 Selecting this option will add support for the integrated serial
268 port hardware found on MIPS RM9122 and similar processors.
271 config SERIAL_8250_FSL
273 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
276 config SERIAL_8250_DW
277 tristate "Support for Synopsys DesignWare 8250 quirks"
278 depends on SERIAL_8250 && OF
280 Selecting this option will enable handling of the extra features
281 present in the Synopsys DesignWare APB UART.