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Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2menu "Character Devices"
3
4config STDERR_CONSOLE
5 bool "stderr console"
6 default y
7 help
Jeff Dike4c9e1382007-10-16 01:26:54 -07008 console driver which dumps all printk messages to stderr.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10config STDIO_CONSOLE
11 bool
12 default y
13
14config SSL
15 bool "Virtual serial line"
16 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070017 The User-Mode Linux environment allows you to create virtual serial
18 lines on the UML that are usually made to show up on the host as
19 ttys or ptys.
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Karol Swietlicki0ba9d3f2008-02-04 22:30:38 -080021 See <http://user-mode-linux.sourceforge.net/old/input.html> for more
Jeff Dike4c9e1382007-10-16 01:26:54 -070022 information and command line examples of how to use this facility.
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Jeff Dike4c9e1382007-10-16 01:26:54 -070024 Unless you have a specific reason for disabling this, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26config NULL_CHAN
27 bool "null channel support"
28 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070029 This option enables support for attaching UML consoles and serial
30 lines to a device similar to /dev/null. Data written to it disappears
31 and there is never any data to be read.
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33config PORT_CHAN
34 bool "port channel support"
35 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070036 This option enables support for attaching UML consoles and serial
37 lines to host portals. They may be accessed with 'telnet <host>
38 <port number>'. Any number of consoles and serial lines may be
39 attached to a single portal, although what UML device you get when
40 you telnet to that portal will be unpredictable.
41 It is safe to say 'Y' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43config PTY_CHAN
44 bool "pty channel support"
45 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070046 This option enables support for attaching UML consoles and serial
47 lines to host pseudo-terminals. Access to both traditional
48 pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
49 with this option. The assignment of UML devices to host devices
50 will be announced in the kernel message log.
51 It is safe to say 'Y' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53config TTY_CHAN
54 bool "tty channel support"
55 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070056 This option enables support for attaching UML consoles and serial
57 lines to host terminals. Access to both virtual consoles
58 (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
59 /dev/pts/*) are controlled by this option.
60 It is safe to say 'Y' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62config XTERM_CHAN
63 bool "xterm channel support"
64 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070065 This option enables support for attaching UML consoles and serial
66 lines to xterms. Each UML device so assigned will be brought up in
67 its own xterm.
68 It is safe to say 'Y' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70config NOCONFIG_CHAN
71 bool
72 default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN)
73
74config CON_ZERO_CHAN
75 string "Default main console channel initialization"
76 default "fd:0,fd:1"
77 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070078 This is the string describing the channel to which the main console
79 will be attached by default. This value can be overridden from the
80 command line. The default value is "fd:0,fd:1", which attaches the
81 main console to stdin and stdout.
82 It is safe to leave this unchanged.
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84config CON_CHAN
85 string "Default console channel initialization"
86 default "xterm"
87 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070088 This is the string describing the channel to which all consoles
89 except the main console will be attached by default. This value can
90 be overridden from the command line. The default value is "xterm",
91 which brings them up in xterms.
92 It is safe to leave this unchanged, although you may wish to change
93 this if you expect the UML that you build to be run in environments
94 which don't have X or xterm available.
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96config SSL_CHAN
97 string "Default serial line channel initialization"
98 default "pty"
99 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700100 This is the string describing the channel to which the serial lines
101 will be attached by default. This value can be overridden from the
102 command line. The default value is "pty", which attaches them to
103 traditional pseudo-terminals.
104 It is safe to leave this unchanged, although you may wish to change
105 this if you expect the UML that you build to be run in environments
106 which don't have a set of /dev/pty* devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108config UNIX98_PTYS
109 bool "Unix98 PTY support"
Jeff Dike4c9e1382007-10-16 01:26:54 -0700110 help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 A pseudo terminal (PTY) is a software device consisting of two
112 halves: a master and a slave. The slave device behaves identical to
113 a physical terminal; the master device is used by a process to
114 read data from and write data to the slave, thereby emulating a
115 terminal. Typical programs for the master side are telnet servers
116 and xterms.
117
118 Linux has traditionally used the BSD-like names /dev/ptyxx for
119 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
120 has a number of problems. The GNU C library glibc 2.1 and later,
121 however, supports the Unix98 naming standard: in order to acquire a
122 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
123 terminal is then made available to the process and the pseudo
124 terminal slave can be accessed as /dev/pts/<number>. What was
125 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
126
127 All modern Linux systems use the Unix98 ptys. Say Y unless
128 you're on an embedded system and want to conserve memory.
129
130config LEGACY_PTYS
131 bool "Legacy (BSD) PTY support"
132 default y
Jeff Dike4c9e1382007-10-16 01:26:54 -0700133 help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 A pseudo terminal (PTY) is a software device consisting of two
135 halves: a master and a slave. The slave device behaves identical to
136 a physical terminal; the master device is used by a process to
137 read data from and write data to the slave, thereby emulating a
138 terminal. Typical programs for the master side are telnet servers
139 and xterms.
140
141 Linux has traditionally used the BSD-like names /dev/ptyxx
142 for masters and /dev/ttyxx for slaves of pseudo
143 terminals. This scheme has a number of problems, including
144 security. This option enables these legacy devices; on most
145 systems, it is safe to say N.
146
Allan Gravescf2775f2007-02-28 20:13:29 -0800147config RAW_DRIVER
Robert P. J. Day63b98712008-05-12 14:01:55 -0700148 tristate "RAW driver (/dev/raw/rawN)"
149 depends on BLOCK
Allan Gravescf2775f2007-02-28 20:13:29 -0800150 help
151 The raw driver permits block devices to be bound to /dev/raw/rawN.
152 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
153 See the raw(8) manpage for more details.
154
Robert P. J. Day63b98712008-05-12 14:01:55 -0700155 Applications should preferably open the device (eg /dev/hda1)
Allan Gravescf2775f2007-02-28 20:13:29 -0800156 with the O_DIRECT flag.
157
158config MAX_RAW_DEVS
159 int "Maximum number of RAW devices to support (1-8192)"
160 depends on RAW_DRIVER
161 default "256"
162 help
163 The maximum number of RAW devices that are supported.
164 Default is 256. Increase this number in case you need lots of
165 raw devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167config LEGACY_PTY_COUNT
168 int "Maximum number of legacy PTY in use"
169 depends on LEGACY_PTYS
170 default "256"
Jeff Dike4c9e1382007-10-16 01:26:54 -0700171 help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 The maximum number of legacy PTYs that can be used at any one time.
173 The default is 256, and should be more than enough. Embedded
174 systems may want to reduce this to save memory.
175
176 When not in use, each legacy PTY occupies 12 bytes on 32-bit
177 architectures and 24 bytes on 64-bit architectures.
178
179config WATCHDOG
180 bool "Watchdog Timer Support"
181
182config WATCHDOG_NOWAYOUT
183 bool "Disable watchdog shutdown on close"
184 depends on WATCHDOG
185
186config SOFT_WATCHDOG
187 tristate "Software Watchdog"
188 depends on WATCHDOG
189
190config UML_WATCHDOG
191 tristate "UML watchdog"
192 depends on WATCHDOG
193
194config UML_SOUND
195 tristate "Sound support"
196 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700197 This option enables UML sound support. If enabled, it will pull in
198 soundcore and the UML hostaudio relay, which acts as a intermediary
199 between the host's dsp and mixer devices and the UML sound system.
200 It is safe to say 'Y' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202config SOUND
203 tristate
204 default UML_SOUND
205
206config HOSTAUDIO
207 tristate
208 default UML_SOUND
209
Paolo 'Blaisorblade' Giarrussof43e6a52006-10-19 23:28:25 -0700210#It is selected elsewhere, so kconfig would warn without this.
211config HW_RANDOM
212 tristate
213 default n
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215config UML_RANDOM
216 tristate "Hardware random number generator"
217 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700218 This option enables UML's "hardware" random number generator. It
219 attaches itself to the host's /dev/random, supplying as much entropy
220 as the host has, rather than the small amount the UML gets from its
221 own drivers. It registers itself as a standard hardware random number
222 generator, major 10, minor 183, and the canonical device name is
223 /dev/hwrng.
224 The way to make use of this is to install the rng-tools package
225 (check your distro, or download from
226 http://sourceforge.net/projects/gkernel/). rngd periodically reads
227 /dev/hwrng and injects the entropy into /dev/random.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Jeff Dike3df59522005-06-08 15:47:50 -0700229config MMAPPER
230 tristate "iomem emulation driver"
231 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700232 This driver allows a host file to be used as emulated IO memory inside
233 UML.
Jeff Dike3df59522005-06-08 15:47:50 -0700234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235endmenu