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The TRAB keyboard implementation is similar to that for LWMON and
R360MPI boards. The only difference concerns key naming. There are 4
keys 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
2) 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 ##;echo
3) 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:
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.