Tim Gover 20deeae5ea pieeprom-2025-06-20: 2712: Add support for a bootloader watchdog (latest) ...

* Add support for a bootloader watchdog
  Add support for a boot watchdog (using PM_RSTC hw wdog) which will
  trigger if the OS is not started within the specified amount of time. The
  watchdog is enabled by setting the BOOT_WATCHDOG_TIMEOUT=N (seconds)
  property in the bootlaoder config.
  The BOOT_WATCHDOG_PARTITION=P property can be set to pass a different
  partition number to the bootloader on reset if the watchdog
  is triggered.
  The boot watchdog is automatically cleared just before starting
  the OS and (optionally) enabling the kernel watchdog.
* pi5: Add a temperature monitor
  In early releases of the bootloader the fan would always be on
  during boot which can be distracting. Later releases switch off the
  fan until the OS has booted.
  This change adds some basic fan control from the bootloader to
  enable the fan if the temperature is above 85C.
  This may be useful if the Pi was shutdown by the OS because the
  temperature limit was exceeded.
  Since the Linux hwmon is not active at this stage the bootloader
  now implements the same logic to power off the Pi if the chips
  is more than 110C.
  The PMIC hardware automatically cuts power if the temperature
  is more than 125C.
* Skip first SD boot if no card detected
  On platforms with an SD Card detect signal, skip the first attempt to
  boot from SD if the card appears to be absent. This can save over a
  second on a cold boot, and a little under a second for a reboot.

2025-06-20 14:44:34 +01:00

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