board/trab/README.kbd

   1
   2 The TRAB keyboard implementation is similar to that for LWMON and
   3 R360MPI boards. The only difference concerns key naming. There are 4
   4 keys on TRAB: 1, 2, 3, 4.
   5
   6 1) 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
  17 2) 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
  34 3) 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.