On Raspberry Pi 5 there are dedicated pins for the bootloader SPI
EEPROM. This makes it possible to do immediate updates via flashrom.
The "current" EEPROM config is the EEPROM config at boot rather
than what has just been written to the SPI flash because this is
consistent with current behaviour.
To use flashrom instead of recovery.bin for bootloader updates
set RPI_EEPROM_USE_FLASHROM=1 in /etc/defaults/rpi-eeprom-update
BCM2711
On CM4, Pi4, CM4-S, Pi400 config.txt must be modified to disable
the analog audio driver which shares the GPIO pins used by the
bootloader EEPROM.
dtparam=spi=on
dtoverlay=audremap
dtoverlay=spi-gpio40-45
BCM2711 and BCM2712 require different EEPROM firmware and
consequently the binaries have been moved to chip specific
firmware directories.
firmware-2711 / firmware-2712
Debian's raspi-firmware package assumes the boot partition is mounted as
/boot/firmware/ rather than /boot/. This commit adds support for either
approach by default.
