Raspberry Pi
EEPROM
EEPROM updates
The EEPROM can be updated from Raspberry Pi OS using the rpi-eeprom-update
tool:
sudo rpi-eeprom-update -a
reboot
Boot order
Boot order is controlled by the BOOT_ORDER
EEPROP configuration option. It can be set with sudo -E rpi-eeprom-config --edit
. Up to eight options may be tried, each expressed as a nibble (4 bits), for a total of 32 bits. Option values can be found in the documentation.
config.txt
The config.txt
file on the /boot
partition is used to store settings typically found in BIOS/EFI.
vcgencmd get_config <[value|int|str]>
prints the active value for a configuration.
The grammar is fairly simple:
- Settings are expressed in
key=value
format. include filename.txt
includes an additional file.- Conditional filters scope settings to specific hardware, and can be combined (
AND
) by listing them one after the other:[all]
resets all previously used filters.[pi<revision>]
and[board-type=<type>]
match models.[none]
prevents matching any hardware.[EDID=edid]
match specific display output EDIDs[0x1234abcd]
matches a specific serial number.[gpio<n>=<0|1>]
match if the numbered GPIO pin is in a high/low state.
UEFI firmware
A build of the TianoCore EDK2 is available for the Raspberry Pi 4. These require setting a custom armstub
value in config.txt
.
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