pieeprom-2025-07-17: 2711: Also require the early-watchdog property (latest)

* arm_loader: Also require the early-watchdog property
  The change correcting the implementation of dtoverlay_is_enabled had the
  unintended consequence of causing the firmware to enable the watchdog
  even though the user had not explicitly requested it. This is harmless
  on Linux because the watchdog driver takes over and disarms it, but on
  other operating systems this can lead to a reboot. Avoid this problem
  by also requiring the presence of a new property, "early-watchdog".
  See: raspberrypi/firmware#1980
* helpers/config_loader: Add bootvar0 eeprom config that can be used in config.txt section expressions
  This allows an eeprom config setting (e.g. BOOTARG0=0x10) to be set on a board
  which config.txt can use as a conditional expression (e.g. [bootarg0&0x10]).
* arm_loader: Fix boot-watchdog stop on Pi4
  Fix a problem where the boot_watchdog heartbeat timer was not
  stopped correctly which could cause it to clash with the kernel
  watchdog driver.

Author: timg236

firmware-2711/latest/pieeprom-2025-07-17.bin

@@ -1,5 +1,23 @@
 # Raspberry Pi4 bootloader EEPROM release notes
 
+## 2025-07-17: arm_loader: Also require the early-watchdog property (latest)
+
+* arm_loader: Also require the early-watchdog property
+  The change correcting the implementation of dtoverlay_is_enabled had the
+  unintended consequence of causing the firmware to enable the watchdog
+  even though the user had not explicitly requested it. This is harmless
+  on Linux because the watchdog driver takes over and disarms it, but on
+  other operating systems this can lead to a reboot. Avoid this problem
+  by also requiring the presence of a new property, "early-watchdog".
+  See: https://github.com/raspberrypi/firmware/issues/1980
+* helpers/config_loader: Add bootvar0 eeprom config that can be used in config.txt section expressions
+  This allows an eeprom config setting (e.g. BOOTARG0=0x10) to be set on a board
+  which config.txt can use as a conditional expression (e.g. [bootarg0&0x10]).
+* arm_loader: Fix boot-watchdog stop on Pi4
+  Fix a problem where the boot_watchdog heartbeat timer was not
+  stopped correctly which could cause it to clash with the kernel
+  watchdog driver.
+
 ## 2025-07-03: Check for SD card overcurrent (latest)
 
 * board_info: Use the Ethernet PHY address probed by the bootloader