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_DEPRECATED_OPTIONS
37 bool "Support 8250_core.* kernel options (DEPRECATED)"
38 depends on SERIAL_8250
41 In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
42 accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
43 8250.nr_uarts=4. We now renamed the module back to 8250, but if
44 anybody noticed in 3.7 and changed their userspace we still have to
45 keep the 8350_core.* options around until they revert the changes
48 If 8250 is built as a module, this adds 8250_core alias instead.
50 If you did not notice yet and/or you have userspace from pre-3.7, it
51 is safe (and recommended) to say N here.
53 config SERIAL_8250_PNP
54 bool "8250/16550 PNP device support" if EXPERT
55 depends on SERIAL_8250 && PNP
58 This builds standard PNP serial support. You may be able to
59 disable this feature if you only need legacy serial support.
61 config SERIAL_8250_CONSOLE
62 bool "Console on 8250/16550 and compatible serial port"
63 depends on SERIAL_8250=y
64 select SERIAL_CORE_CONSOLE
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
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
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
88 "earlycon=uart8250,io,0x3f8,9600n8"
89 "earlycon=uart8250,mmio,0xff5e0000,115200n8".
90 it will not only setup early console.
94 config FIX_EARLYCON_MEM
99 config SERIAL_8250_GSC
101 depends on SERIAL_8250 && GSC
104 config SERIAL_8250_DMA
105 bool "DMA support for 16550 compatible UART controllers" if EXPERT
106 depends on SERIAL_8250 && DMADEVICES=y
109 This builds DMA support that can be used with 8250/16650
110 compatible UART controllers that support DMA signaling.
112 config SERIAL_8250_PCI
113 tristate "8250/16550 PCI device support" if EXPERT
114 depends on SERIAL_8250 && PCI
117 This builds standard PCI serial support. You may be able to
118 disable this feature if you only need legacy serial support.
121 config SERIAL_8250_HP300
123 depends on SERIAL_8250 && HP300
126 config SERIAL_8250_CS
127 tristate "8250/16550 PCMCIA device support"
128 depends on PCMCIA && SERIAL_8250
130 Say Y here to enable support for 16-bit PCMCIA serial devices,
131 including serial port cards, modems, and the modem functions of
132 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
133 credit-card size devices often used with laptops.)
135 To compile this driver as a module, choose M here: the
136 module will be called serial_cs.
140 config SERIAL_8250_NR_UARTS
141 int "Maximum number of 8250/16550 serial ports"
142 depends on SERIAL_8250
145 Set this to the number of serial ports you want the driver
146 to support. This includes any ports discovered via ACPI or
147 PCI enumeration and any ports that may be added at run-time
148 via hot-plug, or any ISA multi-port serial cards.
150 config SERIAL_8250_RUNTIME_UARTS
151 int "Number of 8250/16550 serial ports to register at runtime"
152 depends on SERIAL_8250
153 range 0 SERIAL_8250_NR_UARTS
156 Set this to the maximum number of serial ports you want
157 the kernel to register at boot time. This can be overridden
158 with the module parameter "nr_uarts", or boot-time parameter
161 config SERIAL_8250_EXTENDED
162 bool "Extended 8250/16550 serial driver options"
163 depends on SERIAL_8250
165 If you wish to use any non-standard features of the standard "dumb"
166 driver, say Y here. This includes HUB6 support, shared serial
167 interrupts, special multiport support, support for more than the
168 four COM 1/2/3/4 boards, etc.
170 Note that the answer to this question won't directly affect the
171 kernel: saying N will just cause the configurator to skip all
172 the questions about serial driver options. If unsure, say N.
174 config SERIAL_8250_MANY_PORTS
175 bool "Support more than 4 legacy serial ports"
176 depends on SERIAL_8250_EXTENDED && !IA64
178 Say Y here if you have dumb serial boards other than the four
179 standard COM 1/2/3/4 ports. This may happen if you have an AST
180 FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
181 from <http://www.tldp.org/docs.html#howto>), or other custom
182 serial port hardware which acts similar to standard serial port
183 hardware. If you only use the standard COM 1/2/3/4 ports, you can
184 say N here to save some memory. You can also say Y if you have an
185 "intelligent" multiport card such as Cyclades, Digiboards, etc.
188 # Multi-port serial cards
191 config SERIAL_8250_FOURPORT
192 tristate "Support Fourport cards"
193 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
195 Say Y here if you have an AST FourPort serial board.
197 To compile this driver as a module, choose M here: the module
198 will be called 8250_fourport.
200 config SERIAL_8250_ACCENT
201 tristate "Support Accent cards"
202 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
204 Say Y here if you have an Accent Async serial board.
206 To compile this driver as a module, choose M here: the module
207 will be called 8250_accent.
209 config SERIAL_8250_BOCA
210 tristate "Support Boca cards"
211 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
213 Say Y here if you have a Boca serial board. Please read the Boca
214 mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
216 To compile this driver as a module, choose M here: the module
217 will be called 8250_boca.
219 config SERIAL_8250_EXAR_ST16C554
220 tristate "Support Exar ST16C554/554D Quad UART"
221 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
223 The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
224 tinkering with your Envoy TU301, or have a machine with this UART,
227 To compile this driver as a module, choose M here: the module
228 will be called 8250_exar_st16c554.
230 config SERIAL_8250_HUB6
231 tristate "Support Hub6 cards"
232 depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
234 Say Y here if you have a HUB6 serial board.
236 To compile this driver as a module, choose M here: the module
237 will be called 8250_hub6.
240 # Misc. options/drivers.
243 config SERIAL_8250_SHARE_IRQ
244 bool "Support for sharing serial interrupts"
245 depends on SERIAL_8250_EXTENDED
247 Some serial boards have hardware support which allows multiple dumb
248 serial ports on the same board to share a single IRQ. To enable
249 support for this in the serial driver, say Y here.
251 config SERIAL_8250_DETECT_IRQ
252 bool "Autodetect IRQ on standard ports (unsafe)"
253 depends on SERIAL_8250_EXTENDED
255 Say Y here if you want the kernel to try to guess which IRQ
256 to use for your serial port.
258 This is considered unsafe; it is far better to configure the IRQ in
259 a boot script using the setserial command.
263 config SERIAL_8250_RSA
264 bool "Support RSA serial ports"
265 depends on SERIAL_8250_EXTENDED
267 ::: To be written :::
269 config SERIAL_8250_ACORN
270 tristate "Acorn expansion card serial port support"
271 depends on ARCH_ACORN && SERIAL_8250
273 If you have an Atomwide Serial card or Serial Port card for an Acorn
274 system, say Y to this option. The driver can handle 1, 2, or 3 port
275 cards. If unsure, say N.
277 config SERIAL_8250_FSL
279 depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550
282 config SERIAL_8250_DW
283 tristate "Support for Synopsys DesignWare 8250 quirks"
284 depends on SERIAL_8250
286 Selecting this option will enable handling of the extra features
287 present in the Synopsys DesignWare APB UART.
289 config SERIAL_8250_EM
290 tristate "Support for Emma Mobile integrated serial port"
291 depends on SERIAL_8250 && ARM && HAVE_CLK
293 Selecting this option will add support for the integrated serial
294 port hardware found on the Emma Mobile line of processors.
297 config SERIAL_8250_RT288X
298 bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
299 depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
301 If you have a Ralink RT288x/RT305x SoC based board and want to use the
302 serial port, say Y to this option. The driver can handle up to 2 serial
303 ports. If unsure, say N.