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/config/release/3rdparty/syslinux/doc/keytab-lilo.txt

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 1This is the documentation for the keytab-lilo.pl program.  It was
 2taken verbatim from the LILO-20 README file; only this header was
 3added.
 4
 5LILO program code, documentation and auxiliary programs are
 6Copyright 1992-1997 Werner Almesberger.
 7All rights reserved.
 8
 9Redistribution and use in source and binary forms of parts of or the
10whole original or derived work are permitted provided that the
11original work is properly attributed to the author. The name of the
12author may not be used to endorse or promote products derived from
13this software without specific prior written permission. This work
14is provided "as is" and without any express or implied warranties.
15
16To use a LILO keyboard table with Syslinux, specify the KBDMAP command
17in syslinux.cfg, for example:
18
19	kbdmap de.ktl
20
21============================================================================
22
23Keyboard translation
24--------------------
25
26The PC keyboard emits so-called scan codes, which are basically key
27numbers. The BIOS then translates those scan codes to the character codes
28of the characters printed on the key-caps. By default, the BIOS normally
29assumes that the keyboard has a US layout. Once an operating system is
30loaded, this operating system can use a different mapping.
31
32At boot time, LILO only has access to the basic services provided by the
33BIOS and therefore receives the character codes for an US keyboard. It
34provides a simple mechanism to re-map the character codes to what is
35appropriate for the actual layout.*
36
37  *  The current mechanism isn't perfect, because it sits on top of the
38    scan code to character code translation performed by the BIOS. This
39    means that key combinations that don't produce any useful character on
40    the US keyboard will be ignored by LILO. The advantage of this approach
41    is its simplicity.
42
43
44Compiling keyboard translation tables
45- - - - - - - - - - - - - - - - - - -
46
47LILO obtains layout information from the keyboard translation tables Linux
48uses for the text console. They are usually stored in
49/usr/lib/kbd/keytables. LILO comes with a program keytab-lilo.pl that reads
50those tables and generates a table suitable for use by the map installer.
51keytab-lilo.pl invokes the program loadkeys to print the tables in a format
52that is easy to parse.*
53
54  *  On some systems, only root can execute loadkeys. It is then necessary
55    to run keytab-lilo.pl as root too.
56
57keytab-lilo.pl is used as follows:
58
59  keytab-lilo.pl [ -p <old_code>=<new_code> ] ...
60    [<path>]<default_layout>[.<extension>] ]
61     [<path>]<kbd_layout>[.<extension>] ]
62
63   -p <old_code>=<new_code>
64     Specifies corrections ("patches") to the mapping obtained from the
65    translation table files. E.g. if pressing the upper case "A" should
66    yield an at sign, -p 65=64 would be used. The  -p  option can be
67    repeated any number of times. The codes can also be given as
68    hexadecimal or as octal numbers if they are prefixed with 0x or 0,
69    respectively.
70  <path>  The directory in which the file resides. The default path is
71    /usr/lib/kbd/keytables.
72  <extension>  Usually the trailing .map, which is automatically added if
73    the file name doesn't contain dots.
74  <default_layout>  Is the layout which specifies the translation by the
75    BIOS. If none is specified, us is assumed.
76  <kbd_layout>  Is the actual layout of the keyboard.
77
78keytab-lilo.pl writes the resulting translation table as a binary string to
79standard output. Such tables can be stored anywhere with any name, but the
80suggested naming convention is /boot/<kbd>.ktl ("Keyboard Table for Lilo"),
81where <kbd> is the name of the keyboard layout.
82
83Example:
84
85keytab-lilo.pl de >/boot/de.ktl