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wdenkc6097192002-11-03 00:24:07 +00001
2The TRAB keyboard implementation is similar to that for LWMON and
3R360MPI boards. The only difference concerns key naming. There are 4
4keys on TRAB: 1, 2, 3, 4.
5
61) The "kbd" command provides information about the current state of
7 the keys. For example,
8
9 TRAB # kbd
10 Keys: 1 0 1 0
11
12 means that keys 1 and 3 are pressed. The keyboard status is also
13 stored in the "keybd" environment variable. In this example we get
14
15 keybd=1010
16
172) The "preboot" variable is set according to current environment
18 settings and keys pressed. This is an example:
19
20 TRAB # setenv magic_keys XY
21 TRAB # setenv key_magicX 12
22 TRAB # setenv key_cmdX echo ## Keys 1 + 2 pressed ##\;echo
23 TRAB # setenv key_magicY 13
24 TRAB # setenv key_cmdY echo ## Keys 1 + 3 pressed ##\;echo
25
26 Here "magic_keys=XY" means that the "key_magicX" and "key_magicY"
27 variables will be checked for a match. Each variable "key_magic*"
28 defines a set of keys. In the our example, if keys 1 and 3 are
29 pressed during reset, then "key_magicY" matches, so the "preboot"
30 variable will be set to the contents of "key_cmdY":
31
32 preboot=echo ## Keys 1 + 3 pressed ##;echo
33
343) The TRAB board has optional modem support. When a certain key
35 combination is pressed on the keyboard at power-on, the firmware
36 performs the necessary initialization of the modem and allows for
37 dial-in. The key combination is specified in the
38 "include/configs/trab.h" file. For example:
39
40 #define CONFIG_MODEM_KEY_MAGIC "23"
41
42 means that modem will be initialized if and only if both keys 2, 3
43 are pressed. Note that the format of this string is similar to the
44 format of "key_magic*" environment variables described above.