From 326edcac598586cd077e181bfe7bdec4b0f44c56 Mon Sep 17 00:00:00 2001 From: Tim Gover Date: Tue, 9 Sep 2025 17:36:46 +0100 Subject: [PATCH] eeprom: Describe SD_OVERCURRENT_CHECK override property --- .../computers/raspberry-pi/eeprom-bootloader.adoc | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/documentation/asciidoc/computers/raspberry-pi/eeprom-bootloader.adoc b/documentation/asciidoc/computers/raspberry-pi/eeprom-bootloader.adoc index dfb6d16fd..41725174a 100644 --- a/documentation/asciidoc/computers/raspberry-pi/eeprom-bootloader.adoc +++ b/documentation/asciidoc/computers/raspberry-pi/eeprom-bootloader.adoc @@ -187,6 +187,20 @@ The number of times that SD boot will be retried after failure before moving to Default: `0` +[[SD_OVERCURRENT_CHECK]] +==== `SD_OVERCURRENT_CHECK` + +Raspberry Pi 4, Raspberry Pi 5 and Raspberry Pi 500 only. + +Before booting, the bootloader 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 overcurrent check can be switched from an error to a non-blocking warning by setting `SD_OVERCURRENT_CHECK=0` in the bootloader config. + +Default: `1` + + [[SD_QUIRKS]] ==== `SD_QUIRKS`