The TRAB keyboard implementation is similar to that for LWMON andR360MPI boards. The only difference concerns key naming. There are 4keys on TRAB: 1, 2, 3, 4.1) The "kbd" command provides information about the current state of   the keys. For example,	TRAB # kbd	Keys: 1 0 1 0   means that keys 1 and 3 are pressed. The keyboard status is also   stored in the "keybd" environment variable. In this example we get	keybd=10102) The "preboot" variable is set according to current environment   settings and keys pressed. This is an example:	TRAB # setenv magic_keys XY	TRAB # setenv key_magicX 12	TRAB # setenv key_cmdX echo ## Keys 1 + 2 pressed ##\;echo	TRAB # setenv key_magicY 13	TRAB # setenv key_cmdY echo ## Keys 1 + 3 pressed ##\;echo   Here "magic_keys=XY" means that the "key_magicX" and "key_magicY"   variables will be checked for a match. Each variable "key_magic*"   defines a set of keys. In the our example, if keys 1 and 3 are   pressed during reset, then "key_magicY" matches, so the "preboot"   variable will be set to the contents of "key_cmdY":	preboot=echo ## Keys 1 + 3 pressed ##;echo3) The TRAB board has optional modem support. When a certain key   combination is pressed on the keyboard at power-on, the firmware   performs the necessary initialization of the modem and allows for   dial-in. The key combination is specified in the   "include/configs/trab.h" file. For example:	#define        CONFIG_MODEM_KEY_MAGIC  "23"   means that modem will be initialized if and only if both keys 2, 3   are pressed. Note that the format of this string is similar to the   format of "key_magic*" environment variables described above.