diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/Kconfig_char |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/um/Kconfig_char')
-rw-r--r-- | arch/um/Kconfig_char | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/um/Kconfig_char b/arch/um/Kconfig_char new file mode 100644 index 000000000000..3e50fdb67626 --- /dev/null +++ b/arch/um/Kconfig_char | |||
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1 | |||
2 | menu "Character Devices" | ||
3 | |||
4 | config STDERR_CONSOLE | ||
5 | bool "stderr console" | ||
6 | default y | ||
7 | help | ||
8 | console driver which dumps all printk messages to stderr. | ||
9 | |||
10 | config STDIO_CONSOLE | ||
11 | bool | ||
12 | default y | ||
13 | |||
14 | config SSL | ||
15 | bool "Virtual serial line" | ||
16 | help | ||
17 | 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. | ||
20 | |||
21 | See <http://user-mode-linux.sourceforge.net/input.html> for more | ||
22 | information and command line examples of how to use this facility. | ||
23 | |||
24 | Unless you have a specific reason for disabling this, say Y. | ||
25 | |||
26 | config NULL_CHAN | ||
27 | bool "null channel support" | ||
28 | help | ||
29 | 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. | ||
32 | |||
33 | config PORT_CHAN | ||
34 | bool "port channel support" | ||
35 | help | ||
36 | 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. | ||
42 | |||
43 | config PTY_CHAN | ||
44 | bool "pty channel support" | ||
45 | help | ||
46 | 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. | ||
52 | |||
53 | config TTY_CHAN | ||
54 | bool "tty channel support" | ||
55 | help | ||
56 | 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. | ||
61 | |||
62 | config XTERM_CHAN | ||
63 | bool "xterm channel support" | ||
64 | help | ||
65 | 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 | If you disable this option, then CONFIG_PT_PROXY will be disabled as | ||
69 | well, since UML's gdb currently requires an xterm. | ||
70 | It is safe to say 'Y' here. | ||
71 | |||
72 | config NOCONFIG_CHAN | ||
73 | bool | ||
74 | default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN) | ||
75 | |||
76 | config CON_ZERO_CHAN | ||
77 | string "Default main console channel initialization" | ||
78 | default "fd:0,fd:1" | ||
79 | help | ||
80 | This is the string describing the channel to which the main console | ||
81 | will be attached by default. This value can be overridden from the | ||
82 | command line. The default value is "fd:0,fd:1", which attaches the | ||
83 | main console to stdin and stdout. | ||
84 | It is safe to leave this unchanged. | ||
85 | |||
86 | config CON_CHAN | ||
87 | string "Default console channel initialization" | ||
88 | default "xterm" | ||
89 | help | ||
90 | This is the string describing the channel to which all consoles | ||
91 | except the main console will be attached by default. This value can | ||
92 | be overridden from the command line. The default value is "xterm", | ||
93 | which brings them up in xterms. | ||
94 | It is safe to leave this unchanged, although you may wish to change | ||
95 | this if you expect the UML that you build to be run in environments | ||
96 | which don't have X or xterm available. | ||
97 | |||
98 | config SSL_CHAN | ||
99 | string "Default serial line channel initialization" | ||
100 | default "pty" | ||
101 | help | ||
102 | This is the string describing the channel to which the serial lines | ||
103 | will be attached by default. This value can be overridden from the | ||
104 | command line. The default value is "pty", which attaches them to | ||
105 | traditional pseudo-terminals. | ||
106 | It is safe to leave this unchanged, although you may wish to change | ||
107 | this if you expect the UML that you build to be run in environments | ||
108 | which don't have a set of /dev/pty* devices. | ||
109 | |||
110 | config UNIX98_PTYS | ||
111 | bool "Unix98 PTY support" | ||
112 | ---help--- | ||
113 | A pseudo terminal (PTY) is a software device consisting of two | ||
114 | halves: a master and a slave. The slave device behaves identical to | ||
115 | a physical terminal; the master device is used by a process to | ||
116 | read data from and write data to the slave, thereby emulating a | ||
117 | terminal. Typical programs for the master side are telnet servers | ||
118 | and xterms. | ||
119 | |||
120 | Linux has traditionally used the BSD-like names /dev/ptyxx for | ||
121 | masters and /dev/ttyxx for slaves of pseudo terminals. This scheme | ||
122 | has a number of problems. The GNU C library glibc 2.1 and later, | ||
123 | however, supports the Unix98 naming standard: in order to acquire a | ||
124 | pseudo terminal, a process opens /dev/ptmx; the number of the pseudo | ||
125 | terminal is then made available to the process and the pseudo | ||
126 | terminal slave can be accessed as /dev/pts/<number>. What was | ||
127 | traditionally /dev/ttyp2 will then be /dev/pts/2, for example. | ||
128 | |||
129 | All modern Linux systems use the Unix98 ptys. Say Y unless | ||
130 | you're on an embedded system and want to conserve memory. | ||
131 | |||
132 | config LEGACY_PTYS | ||
133 | bool "Legacy (BSD) PTY support" | ||
134 | default y | ||
135 | ---help--- | ||
136 | A pseudo terminal (PTY) is a software device consisting of two | ||
137 | halves: a master and a slave. The slave device behaves identical to | ||
138 | a physical terminal; the master device is used by a process to | ||
139 | read data from and write data to the slave, thereby emulating a | ||
140 | terminal. Typical programs for the master side are telnet servers | ||
141 | and xterms. | ||
142 | |||
143 | Linux has traditionally used the BSD-like names /dev/ptyxx | ||
144 | for masters and /dev/ttyxx for slaves of pseudo | ||
145 | terminals. This scheme has a number of problems, including | ||
146 | security. This option enables these legacy devices; on most | ||
147 | systems, it is safe to say N. | ||
148 | |||
149 | |||
150 | config LEGACY_PTY_COUNT | ||
151 | int "Maximum number of legacy PTY in use" | ||
152 | depends on LEGACY_PTYS | ||
153 | default "256" | ||
154 | ---help--- | ||
155 | The maximum number of legacy PTYs that can be used at any one time. | ||
156 | The default is 256, and should be more than enough. Embedded | ||
157 | systems may want to reduce this to save memory. | ||
158 | |||
159 | When not in use, each legacy PTY occupies 12 bytes on 32-bit | ||
160 | architectures and 24 bytes on 64-bit architectures. | ||
161 | |||
162 | config WATCHDOG | ||
163 | bool "Watchdog Timer Support" | ||
164 | |||
165 | config WATCHDOG_NOWAYOUT | ||
166 | bool "Disable watchdog shutdown on close" | ||
167 | depends on WATCHDOG | ||
168 | |||
169 | config SOFT_WATCHDOG | ||
170 | tristate "Software Watchdog" | ||
171 | depends on WATCHDOG | ||
172 | |||
173 | config UML_WATCHDOG | ||
174 | tristate "UML watchdog" | ||
175 | depends on WATCHDOG | ||
176 | |||
177 | config UML_SOUND | ||
178 | tristate "Sound support" | ||
179 | help | ||
180 | This option enables UML sound support. If enabled, it will pull in | ||
181 | soundcore and the UML hostaudio relay, which acts as a intermediary | ||
182 | between the host's dsp and mixer devices and the UML sound system. | ||
183 | It is safe to say 'Y' here. | ||
184 | |||
185 | config SOUND | ||
186 | tristate | ||
187 | default UML_SOUND | ||
188 | |||
189 | config HOSTAUDIO | ||
190 | tristate | ||
191 | default UML_SOUND | ||
192 | |||
193 | config UML_RANDOM | ||
194 | tristate "Hardware random number generator" | ||
195 | help | ||
196 | This option enables UML's "hardware" random number generator. It | ||
197 | attaches itself to the host's /dev/random, supplying as much entropy | ||
198 | as the host has, rather than the small amount the UML gets from its | ||
199 | own drivers. It registers itself as a standard hardware random number | ||
200 | generator, major 10, minor 183, and the canonical device name is | ||
201 | /dev/hwrng. | ||
202 | The way to make use of this is to install the rng-tools package | ||
203 | (check your distro, or download from | ||
204 | http://sourceforge.net/projects/gkernel/). rngd periodically reads | ||
205 | /dev/hwrng and injects the entropy into /dev/random. | ||
206 | |||
207 | endmenu | ||
208 | |||