uboot/doc/README.watchdog
<<
>>
Prefs
   1Watchdog driver general info
   2
   3CONFIG_HW_WATCHDOG
   4        This enables hw_watchdog_reset to be called during various loops,
   5        including waiting for a character on a serial port. But it
   6        does not also call hw_watchdog_init. Boards which want this
   7        enabled must call this function in their board file. This split
   8        is useful because some rom's enable the watchdog when downloading
   9        new code, so it must be serviced, but the board would rather it
  10        was off. And, it cannot always be turned off once on.
  11
  12CONFIG_WATCHDOG_TIMEOUT_MSECS
  13        Can be used to change the timeout for i.mx31/35/5x/6x.
  14        If not given, will default to maximum timeout. This would
  15        be 128000 msec for i.mx31/35/5x/6x.
  16
  17CONFIG_WDT_AT91
  18        Available for AT91SAM9 to service the watchdog.
  19
  20CONFIG_FTWDT010_WATCHDOG
  21        Available for FTWDT010 to service the watchdog.
  22
  23CONFIG_FTWDT010_HW_TIMEOUT
  24        Can be used to change the timeout for FTWDT010.
  25
  26CONFIG_IMX_WATCHDOG
  27        Available for i.mx31/35/5x/6x to service the watchdog. This is not
  28        automatically set because some boards (vision2) still need to define
  29        their own hw_watchdog_reset routine.
  30        TODO: vision2 is removed now, so perhaps this can be changed.
  31
  32CONFIG_XILINX_TB_WATCHDOG
  33        Available for Xilinx Axi platforms to service timebase watchdog timer.
  34