- The User-Mode Linux environment allows you to create virtual serial
- lines on the UML that are usually made to show up on the host as
- ttys or ptys.
+ The User-Mode Linux environment allows you to create virtual serial
+ lines on the UML that are usually made to show up on the host as
+ ttys or ptys.
- See <http://user-mode-linux.sourceforge.net/input.html> for more
- information and command line examples of how to use this facility.
+ See <http://user-mode-linux.sourceforge.net/old/input.html> for more
+ information and command line examples of how to use this facility.
- This option enables support for attaching UML consoles and serial
- lines to a device similar to /dev/null. Data written to it disappears
- and there is never any data to be read.
+ This option enables support for attaching UML consoles and serial
+ lines to a device similar to /dev/null. Data written to it disappears
+ and there is never any data to be read.
- This option enables support for attaching UML consoles and serial
- lines to host portals. They may be accessed with 'telnet <host>
- <port number>'. Any number of consoles and serial lines may be
- attached to a single portal, although what UML device you get when
- you telnet to that portal will be unpredictable.
- It is safe to say 'Y' here.
+ This option enables support for attaching UML consoles and serial
+ lines to host portals. They may be accessed with 'telnet <host>
+ <port number>'. Any number of consoles and serial lines may be
+ attached to a single portal, although what UML device you get when
+ you telnet to that portal will be unpredictable.
+ It is safe to say 'Y' here.
- This option enables support for attaching UML consoles and serial
- lines to host pseudo-terminals. Access to both traditional
- pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
- with this option. The assignment of UML devices to host devices
- will be announced in the kernel message log.
- It is safe to say 'Y' here.
+ This option enables support for attaching UML consoles and serial
+ lines to host pseudo-terminals. Access to both traditional
+ pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
+ with this option. The assignment of UML devices to host devices
+ will be announced in the kernel message log.
+ It is safe to say 'Y' here.
- This option enables support for attaching UML consoles and serial
- lines to host terminals. Access to both virtual consoles
- (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
- /dev/pts/*) are controlled by this option.
- It is safe to say 'Y' here.
+ This option enables support for attaching UML consoles and serial
+ lines to host terminals. Access to both virtual consoles
+ (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
+ /dev/pts/*) are controlled by this option.
+ It is safe to say 'Y' here.
- This option enables support for attaching UML consoles and serial
- lines to xterms. Each UML device so assigned will be brought up in
- its own xterm.
- If you disable this option, then CONFIG_PT_PROXY will be disabled as
- well, since UML's gdb currently requires an xterm.
- It is safe to say 'Y' here.
+ This option enables support for attaching UML consoles and serial
+ lines to xterms. Each UML device so assigned will be brought up in
+ its own xterm.
+ It is safe to say 'Y' here.
- This is the string describing the channel to which the main console
- will be attached by default. This value can be overridden from the
- command line. The default value is "fd:0,fd:1", which attaches the
- main console to stdin and stdout.
- It is safe to leave this unchanged.
+ This is the string describing the channel to which the main console
+ will be attached by default. This value can be overridden from the
+ command line. The default value is "fd:0,fd:1", which attaches the
+ main console to stdin and stdout.
+ It is safe to leave this unchanged.
- This is the string describing the channel to which all consoles
- except the main console will be attached by default. This value can
- be overridden from the command line. The default value is "xterm",
- which brings them up in xterms.
- It is safe to leave this unchanged, although you may wish to change
- this if you expect the UML that you build to be run in environments
- which don't have X or xterm available.
+ This is the string describing the channel to which all consoles
+ except the main console will be attached by default. This value can
+ be overridden from the command line. The default value is "xterm",
+ which brings them up in xterms.
+ It is safe to leave this unchanged, although you may wish to change
+ this if you expect the UML that you build to be run in environments
+ which don't have X or xterm available.
- This is the string describing the channel to which the serial lines
- will be attached by default. This value can be overridden from the
- command line. The default value is "pty", which attaches them to
- traditional pseudo-terminals.
- It is safe to leave this unchanged, although you may wish to change
- this if you expect the UML that you build to be run in environments
- which don't have a set of /dev/pty* devices.
+ This is the string describing the channel to which the serial lines
+ will be attached by default. This value can be overridden from the
+ command line. The default value is "pty", which attaches them to
+ traditional pseudo-terminals.
+ It is safe to leave this unchanged, although you may wish to change
+ this if you expect the UML that you build to be run in environments
+ which don't have a set of /dev/pty* devices.
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
security. This option enables these legacy devices; on most
systems, it is safe to say N.
security. This option enables these legacy devices; on most
systems, it is safe to say N.
+config RAW_DRIVER
+ tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
+ help
+ The raw driver permits block devices to be bound to /dev/raw/rawN.
+ Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
+ See the raw(8) manpage for more details.
+
+ The raw driver is deprecated and will be removed soon.
+ Applications should simply open the device (eg /dev/hda1)
+ with the O_DIRECT flag.
+
+config MAX_RAW_DEVS
+ int "Maximum number of RAW devices to support (1-8192)"
+ depends on RAW_DRIVER
+ default "256"
+ help
+ The maximum number of RAW devices that are supported.
+ Default is 256. Increase this number in case you need lots of
+ raw devices.
The maximum number of legacy PTYs that can be used at any one time.
The default is 256, and should be more than enough. Embedded
systems may want to reduce this to save memory.
The maximum number of legacy PTYs that can be used at any one time.
The default is 256, and should be more than enough. Embedded
systems may want to reduce this to save memory.
- This option enables UML sound support. If enabled, it will pull in
- soundcore and the UML hostaudio relay, which acts as a intermediary
- between the host's dsp and mixer devices and the UML sound system.
- It is safe to say 'Y' here.
+ This option enables UML sound support. If enabled, it will pull in
+ soundcore and the UML hostaudio relay, which acts as a intermediary
+ between the host's dsp and mixer devices and the UML sound system.
+ It is safe to say 'Y' here.
- This option enables UML's "hardware" random number generator. It
- attaches itself to the host's /dev/random, supplying as much entropy
- as the host has, rather than the small amount the UML gets from its
- own drivers. It registers itself as a standard hardware random number
- generator, major 10, minor 183, and the canonical device name is
- /dev/hwrng.
- The way to make use of this is to install the rng-tools package
- (check your distro, or download from
- http://sourceforge.net/projects/gkernel/). rngd periodically reads
- /dev/hwrng and injects the entropy into /dev/random.
+ This option enables UML's "hardware" random number generator. It
+ attaches itself to the host's /dev/random, supplying as much entropy
+ as the host has, rather than the small amount the UML gets from its
+ own drivers. It registers itself as a standard hardware random number
+ generator, major 10, minor 183, and the canonical device name is
+ /dev/hwrng.
+ The way to make use of this is to install the rng-tools package
+ (check your distro, or download from
+ http://sourceforge.net/projects/gkernel/). rngd periodically reads
+ /dev/hwrng and injects the entropy into /dev/random.