pieeprom-2025-06-29: 2712: Check for SD card overcurrent on Pi5 and Pi500 (latest) #721
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…i500 (latest) * 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 * pi5: Fix overwrite of cache EEPROM config in secure-boot mode See: raspberrypi#719 * 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 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. * Enable RTC wakeup from POWER_OFF_ON_HALT=0 * Improve HAT+ current handling In shipping firmware, the current_supply value is only being used in the case of a normal (non-stacked) HAT+, but that is unnecessarily restrictive. Also, the presence of MODE0 and MODE1 power HATs is not reflected in the value of max_current. See: raspberrypi/linux#6678
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Use the Ethernet PHY address supplied by the bootloader in preference to the static configurations defined in start4.elf
See: Pasbberry Pi 5 OVERLAP DETECTED! after "program_pubkey=1" #719
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 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.
In shipping firmware, the current_supply value is only being used in the case of a normal (non-stacked) HAT+, but that is unnecessarily restrictive. Also, the presence of MODE0 and MODE1 power HATs is not reflected in the value of max_current.
See: Overlays: Adding generic overlay for Cytron standard HAT+ boards that also supply power to the Raspberry Pi. linux#6678