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rpi-eeprom-update: Expand help to describe CM4 bootloader updates (#293)

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Add some brief documentation about CM4 bootloader updates and provide
links to the full documentation.
This commit is contained in:
timg236
2021-02-12 08:53:32 +00:00
committed by GitHub
parent cfc700e2f7
commit 2fec47bd7f
1 changed files with 26 additions and 1 deletions
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rpi-eeprom-update
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@@ -316,7 +316,7 @@ checkDependencies() {
if [ ${BOARD_TYPE} -eq 20 ] && [ "${CM4_ENABLE_RPI_EEPROM_UPDATE}" != '1' ]; then if [ ${BOARD_TYPE} -eq 20 ] && [ "${CM4_ENABLE_RPI_EEPROM_UPDATE}" != '1' ]; then
# For CM4, USB device boot is the recommended method for EEPROM updates. # For CM4, USB device boot is the recommended method for EEPROM updates.
echo "rpi-eeprom-update is not enabled by default on CM4" echo "rpi-eeprom-update is not enabled by default on CM4. Run with -h for more information."
exit ${EXIT_SUCCESS} exit ${EXIT_SUCCESS}
fi fi
@@ -471,6 +471,31 @@ The syntax is the same as config.txt See online documentation for the list of pa
The official documentation for the Raspberry Pi bootloader EEPROM is available at The official documentation for the Raspberry Pi bootloader EEPROM is available at
https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md
Compute Module 4 (CM4):
CM4 is designed to support embedded applications where physical access to the CM4
may be limited. An invalid bootloader configuration or software bug could
cause the system to fail to boot so automatic updates are disabled. We also
recommend write-protecting the SPI EPPROM after flashing it using usbboot.
CM4 bootloader and EEPROM update instructions:
https://www.raspberrypi.org/documentation/hardware/computemodule/cm-emmc-flashing.md
usbboot instructions for flashing CM4 EMMC and bootloader EEPROM:
https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
The CM4 ROM does not support running recovery.bin from the EMMC on CM4 so this service
is disabled by default. SELF_UPDATE from USB or Network boot is supported but this
must first be enabled by removing ENABLE_SELF_UPDATE=0 from the EEPROM config
via usbboot.
After enabling self-update set the CM4_ENABLE_RPI_EEPROM_UPDATE=1 environment
variable or define it in /etc/default/rpi-eeprom-update.
N.B. If there is a power failure during SELF_UPDATE the EEPROM write may fail and
usbboot must be used to flash the bootloader EEPROM. SELF_UPDATE is not recommended
for updating the bootloader on remote systems.
EOF EOF
exit ${EXIT_SUCCESS} exit ${EXIT_SUCCESS}
} }