mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-26 05:34:30 +08:00
45 lines
1.7 KiB
Plaintext
45 lines
1.7 KiB
Plaintext
|
|
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
|
|
|
|
keybd=1010
|
|
|
|
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:
|
|
|
|
#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.
|