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_PNP
37 bool "8250/16550 PNP device support" if EXPERT
38 depends on SERIAL_8250 && PNP
41 This builds standard PNP serial support. You may be able to
42 disable this feature if you only need legacy serial support.
44 config SERIAL_8250_CONSOLE
45 bool "Console on 8250/16550 and compatible serial port"
46 depends on SERIAL_8250=y
47 select SERIAL_CORE_CONSOLE
49 If you say Y here, it will be possible to use a serial port as the
50 system console (the system console is the device which receives all
51 kernel messages and warnings and which allows logins in single user
52 mode). This could be useful if some terminal or printer is connected
55 Even if you say Y here, the currently visible virtual console
56 (/dev/tty0) will still be used as the system console by default, but
57 you can alter that using a kernel command line option such as
58 "console=ttyS1". (Try "man bootparam" or see the documentation of
59 your boot loader (grub or lilo or loadlin) about how to pass options
60 to the kernel at boot time.)
62 If you don't have a VGA card installed and you say Y here, the
63 kernel will automatically use the first serial line, /dev/ttyS0, as
66 You can set that using a kernel command line option such as
67 "console=uart8250,io,0x3f8,9600n8"
68 "console=uart8250,mmio,0xff5e0000,115200n8".
69 and it will switch to normal serial console when the corresponding
71 "earlycon=uart8250,io,0x3f8,9600n8"
72 "earlycon=uart8250,mmio,0xff5e0000,115200n8".
73 it will not only setup early console.
77 config FIX_EARLYCON_MEM
82 config SERIAL_8250_GSC
84 depends on SERIAL_8250 && GSC
87 config SERIAL_8250_DMA
88 bool "DMA support for 16550 compatible UART controllers" if EXPERT
89 depends on SERIAL_8250 && DMADEVICES=y
92 This builds DMA support that can be used with 8250/16650
93 compatible UART controllers that support DMA signaling.
95 config SERIAL_8250_PCI
96 tristate "8250/16550 PCI device support" if EXPERT
97 depends on SERIAL_8250 && PCI
100 This builds standard PCI serial support. You may be able to
101 disable this feature if you only need legacy serial support.
104 config SERIAL_8250_HP300
106 depends on SERIAL_8250 && HP300
109 config SERIAL_8250_CS
110 tristate "8250/16550 PCMCIA device support"
111 depends on PCMCIA && SERIAL_8250
113 Say Y here to enable support for 16-bit PCMCIA serial devices,
114 including serial port cards, modems, and the modem functions of
115 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
116 credit-card size devices often used with laptops.)
118 To compile this driver as a module, choose M here: the
119 module will be called serial_cs.
123 config SERIAL_8250_NR_UARTS
124 int "Maximum number of 8250/16550 serial ports"
125 depends on SERIAL_8250
128 Set this to the number of serial ports you want the driver
129 to support. This includes any ports discovered via ACPI or
130 PCI enumeration and any ports that may be added at run-time
131 via hot-plug, or any ISA multi-port serial cards.
133 config SERIAL_8250_RUNTIME_UARTS
134 int "Number of 8250/16550 serial ports to register at runtime"
135 depends on SERIAL_8250
136 range 0 SERIAL_8250_NR_UARTS
139 Set this to the maximum number of serial ports you want
140 the kernel to register at boot time. This can be overridden
141 with the module parameter "nr_uarts", or boot-time parameter
144 config SERIAL_8250_EXTENDED
145 bool "Extended 8250/16550 serial driver options"
146 depends on SERIAL_8250
148 If you wish to use any non-standard features of the standard "dumb"
149 driver, say Y here. This includes HUB6 support, shared serial
150 interrupts, special multiport support, support for more than the
151 four COM 1/2/3/4 boards, etc.
153 Note that the answer to this question won't directly affect the
154 kernel: saying N will just cause the configurator to skip all
155 the questions about serial driver options. If unsure, say N.
157 config SERIAL_8250_MANY_PORTS
158 bool "Support more than 4 legacy serial ports"
159 depends on SERIAL_8250_EXTENDED && !IA64
161 Say Y here if you have dumb serial boards other than the four
162 standard COM 1/2/3/4 ports. This may happen if you have an AST
163 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
164 from <http://www.tldp.org/docs.html#howto>), or other custom
165 serial port hardware which acts similar to standard serial port
166 hardware. If you only use the standard COM 1/2/3/4 ports, you can
167 say N here to save some memory. You can also say Y if you have an
168 "intelligent" multiport card such as Cyclades, Digiboards, etc.
171 # Multi-port serial cards
174 config SERIAL_8250_FOURPORT
175 tristate "Support Fourport cards"
176 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
178 Say Y here if you have an AST FourPort serial board.
180 To compile this driver as a module, choose M here: the module
181 will be called 8250_fourport.
183 config SERIAL_8250_ACCENT
184 tristate "Support Accent cards"
185 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
187 Say Y here if you have an Accent Async serial board.
189 To compile this driver as a module, choose M here: the module
190 will be called 8250_accent.
192 config SERIAL_8250_BOCA
193 tristate "Support Boca cards"
194 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
196 Say Y here if you have a Boca serial board. Please read the Boca
197 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
199 To compile this driver as a module, choose M here: the module
200 will be called 8250_boca.
202 config SERIAL_8250_EXAR_ST16C554
203 tristate "Support Exar ST16C554/554D Quad UART"
204 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
206 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
207 tinkering with your Envoy TU301, or have a machine with this UART,
210 To compile this driver as a module, choose M here: the module
211 will be called 8250_exar_st16c554.
213 config SERIAL_8250_HUB6
214 tristate "Support Hub6 cards"
215 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
217 Say Y here if you have a HUB6 serial board.
219 To compile this driver as a module, choose M here: the module
220 will be called 8250_hub6.
223 # Misc. options/drivers.
226 config SERIAL_8250_SHARE_IRQ
227 bool "Support for sharing serial interrupts"
228 depends on SERIAL_8250_EXTENDED
230 Some serial boards have hardware support which allows multiple dumb
231 serial ports on the same board to share a single IRQ. To enable
232 support for this in the serial driver, say Y here.
234 config SERIAL_8250_DETECT_IRQ
235 bool "Autodetect IRQ on standard ports (unsafe)"
236 depends on SERIAL_8250_EXTENDED
238 Say Y here if you want the kernel to try to guess which IRQ
239 to use for your serial port.
241 This is considered unsafe; it is far better to configure the IRQ in
242 a boot script using the setserial command.
246 config SERIAL_8250_RSA
247 bool "Support RSA serial ports"
248 depends on SERIAL_8250_EXTENDED
250 ::: To be written :::
252 config SERIAL_8250_ACORN
253 tristate "Acorn expansion card serial port support"
254 depends on ARCH_ACORN && SERIAL_8250
256 If you have an Atomwide Serial card or Serial Port card for an Acorn
257 system, say Y to this option. The driver can handle 1, 2, or 3 port
258 cards. If unsure, say N.
260 config SERIAL_8250_FSL
262 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
265 config SERIAL_8250_DW
266 tristate "Support for Synopsys DesignWare 8250 quirks"
267 depends on SERIAL_8250
269 Selecting this option will enable handling of the extra features
270 present in the Synopsys DesignWare APB UART.
272 config SERIAL_8250_EM
273 tristate "Support for Emma Mobile integrated serial port"
274 depends on SERIAL_8250 && ARM && HAVE_CLK
276 Selecting this option will add support for the integrated serial
277 port hardware found on the Emma Mobile line of processors.
280 config SERIAL_8250_RT288X
281 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
282 depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
284 If you have a Ralink RT288x/RT305x SoC based board and want to use the
285 serial port, say Y to this option. The driver can handle up to 2 serial
286 ports. If unsure, say N.