pieeprom-2025-07-03: 2711: Check for SD card overcurrent (latest) #726
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* board_info: Use the Ethernet PHY address probed by the bootloader Use the Ethernet PHY address supplied by the bootloader in preference to the static configurations defined in start4.elf * Check for SD card overcurrent on Pi5, Pi500 and Pi4 Before booting, the bootloader now checks the SD power switch overcurrent signal. The overcurrent signal occurs if the SD card is damaged and has a short circuit which will cause it to get hot. If an over-current condition is detected the bootloader switches switches off power to the SD card and waits five seconds before probing the SD card again. This error is displayed on the diagnostic screen, the UART and the activity LED (1 long, 2 short) flashes. The check can be switched to a non-blocking warning by setting SD_OVERCURRENT_CHECK=0 in the bootloader config. * Add a new error code pattern for SD overcurrent Add a new error pattern (1 long, 2 short) to signal SD card overcurrent. * 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. * 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.
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Use the Ethernet PHY address supplied by the bootloader in preference to the static configurations defined in start4.elf
Before booting, the bootloader now checks the SD power switch overcurrent signal. The overcurrent signal occurs if the SD card is damaged and has a short circuit which will cause it to get hot. If an over-current condition is detected the bootloader switches switches off power to the SD card and waits five seconds before probing the SD card again. This error is displayed on the diagnostic screen, the UART and the activity LED (1 long, 2 short) flashes. The check can be switched to a non-blocking warning by setting SD_OVERCURRENT_CHECK=0 in the bootloader config.
Add a new error pattern (1 long, 2 short) to signal SD card overcurrent.
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.
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.