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rpi-eeprom-update: add CM4S (board_type 21) support #806

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Merged
timg236 merged 2 commits into from
Feb 18, 2026
Merged

rpi-eeprom-update: add CM4S (board_type 21) support #806

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rpi-eeprom-update: add CM4S (board_type 21) support
nbuchwitz Feb 15, 2026
b4ffa0d
help: copy-edit
timg236 Feb 18, 2026
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23 changes: 14 additions & 9 deletions rpi-eeprom-update
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Original file line number Diff line number Diff line change
Expand Up @@ -458,23 +458,28 @@ checkDependencies() {
BOARD_TYPE=$(((0x$BOARD_INFO >> 4) & 0xff))
BOARD_REVISION=$((0x$BOARD_INFO & 0xf))

if [ ${BOARD_TYPE} -eq 20 ] && [ "${CM4_ENABLE_RPI_EEPROM_UPDATE}" != '1' ]; then
# For CM4, USB device boot is the recommended method for EEPROM updates.
echo "rpi-eeprom-update is not enabled by default on CM4."
if ([ ${BOARD_TYPE} -eq 20 ] || [ ${BOARD_TYPE} -eq 21 ]) && [ "${CM4_ENABLE_RPI_EEPROM_UPDATE}" != '1' ]; then
# For CM4/CM4S, USB device boot is the recommended method for EEPROM updates.
echo "rpi-eeprom-update is not enabled by default on CM4(S)."
echo "The recommended method for flashing the EEPROM is rpiboot."
echo "See: https://github.com/raspberrypi/usbboot/blob/master/Readme.md"
echo "Run with -h for more information."
echo
echo "To enable flashrom programming of the EEPROM"
echo "Add these the following entries to /etc/default/rpi-eeprom-update"
echo "Add the following entries to /etc/default/rpi-eeprom-update"
echo "RPI_EEPROM_USE_FLASHROM=1"
echo "CM4_ENABLE_RPI_EEPROM_UPDATE=1"
echo
echo
echo "and these entries to config.txt and reboot"
echo "[cm4]"
echo "dtparam=spi=on"
echo "dtoverlay=audremap"
echo "dtoverlay=spi-gpio40-45"
if [ ${BOARD_TYPE} -eq 21 ]; then
echo "[cm4s]"
echo "dtparam=enable_eeprom=on"
else
echo "[cm4]"
fi
echo "dtparam=spi=on"
echo "dtoverlay=audremap"
echo "dtoverlay=spi-gpio40-45"
echo
exit ${EXIT_SUCCESS}
fi
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