rpi-eeprom

This repository contains the scripts and pre-compiled binaries used to create the rpi-eeprom package which is used to update the bootloader EEPROM on the following Raspberry Pi models:

• Raspberry Pi 4 Model B
• Raspberry Pi 400
• Compute Module 4 (CM4)
• Compute Module 4S (CM4S)
• Raspberry Pi 5
• Raspberry Pi 500
• Raspberry Pi 500+
• Compute Module 5 (CM5)

The firmware-2711 directory contains the EEPROM images for BCM2711-based products (Pi 4, Pi 400, CM4, CM4S) and firmware-2712 contains the images for BCM2712-based products (Pi 5, Pi 500, CM5).

Scripts

The end-user tool is rpi-eeprom-update. The remaining scripts are building blocks used when preparing a custom or signed EEPROM image — typically driven from update-pieeprom.sh in the usbboot repository.

• rpi-eeprom-update — End-user updater run by the rpi-eeprom-update systemd service on Raspberry Pi OS. Compares the currently installed EEPROM version against the selected release (default, latest, etc. in firmware-2711/firmware-2712) and, if newer, stages the image so that it is flashed at the next reboot by recovery.bin (or by self-update on BCM2711). Can also install an arbitrary image with rpi-eeprom-update -d -f pieeprom.bin. See the Immediate (flashrom) updates section below for in-place flashing.

• rpi-eeprom-config — Operates on an EEPROM image (pieeprom.bin). It can:

  • extract the bootconf.txt configuration block (rpi-eeprom-config pieeprom.bin --out boot.conf),
  • write a new image with a replacement config (rpi-eeprom-config --config boot.conf --out new.bin pieeprom.bin),
  • edit the installed bootloader's config in place (sudo -E rpi-eeprom-config --edit),
  • embed a signed config block plus RSA public key for signed-boot (--config, --digest, --pubkey),
  • replace the signed bootcode/bootsys sub-binaries inside a BCM2712 image (--bootcode, --bootsys).

• rpi-eeprom-digest — Generates the .sig files (SHA256 + timestamp, plus an optional RSA PKCS#1 v1.5 signature for signed-boot) used in two places:

  • bootconf.sig — produced when building a signed EEPROM image, so the bootloader can verify its own configuration block.
  • boot.sig — produced alongside the secure-boot boot.img ramdisk so the bootloader can verify the OS payload at boot.

  Signing is delegated to openssl (soft dependency), or to an external HSM via the -H hsm-wrapper interface.

• tools/rpi-sign-bootcode — Customer signing for the bootloader's own second-stage binary. On BCM2712 (-c 2712), it counter-signs the Raspberry-Pi-signed bootcode/bootsys with the customer key — required by the BCM2712 ROM when secure-boot is enabled. On BCM2711 (-c 2711), it produces the HMAC + RSA-signed second-stage image consumed by the BCM2711 ROM. Also supports HSM signing via -H.

• tools/rpi-bootloader-key-convert — Converts RSA-2048 public keys between PEM and the 264-byte little-endian raw format that the Raspberry Pi 4 (BCM2711) bootloader expects when the public key is embedded in EEPROM.

• tools/rpi-otp-private-key — Deprecated. Reads or writes the device-unique private key stored in OTP. Use rpi-fw-crypto from the raspberrypi/utils repository instead.

• tools/vl805 — Deprecated. Updater for the VL805 USB 3.0 controller firmware on early Raspberry Pi 4 boards that have a dedicated VL805 EEPROM. Newer board revisions embed the VLI firmware in the bootloader EEPROM and do not need this tool.

Immediate (flashrom) updates

By default rpi-eeprom-update stages the new image to the boot partition and the EEPROM is rewritten by recovery.bin at the next reboot. Setting RPI_EEPROM_IMMEDIATE_UPDATE=1 (in /etc/default/rpi-eeprom-update) instead writes the EEPROM while the system is running, using one of:

• rpi-eeprom-ab — used on BCM2712 boards that already have AB EEPROM enabled. No extra setup beyond RPI_EEPROM_IMMEDIATE_UPDATE=1.
• flashrom — used on all other boards. Requires the flashrom package to be installed; rpi-eeprom-update will fall back to the staged update if flashrom is not on PATH.

Warning: power must not be lost during a flashrom update. If it is, the EEPROM must be re-flashed using the Raspberry Pi Imager bootloader-restore feature.

flashrom SPI flash-chip support

Before performing an immediate update, rpi-eeprom-update probes the SPI flash via flashrom -p linux_spi:dev=<spidev> and aborts back to a staged update if the probe fails, or reports Unknown flash chip. Generic SFDP handling of unknown flash chips is not supported as SFDP data cannot always be trusted.

Raspberry Pi OS ships a patched downstream flashrom 1.4 with definitions for all the different chips a Raspberry Pi could be manufactured with. If you are running rpi-eeprom-update on another distribution, either use that patched build or a flashrom release new enough to contain all the chip definitions; otherwise leave RPI_EEPROM_IMMEDIATE_UPDATE unset and rely on the staged update path.

Raspberry Pi 5 / 500 / 500+ / CM5 (BCM2712)

No config.txt changes are needed. Set RPI_EEPROM_IMMEDIATE_UPDATE=1 in /etc/default/rpi-eeprom-update. If AB EEPROM is enabled rpi-eeprom-ab is used; otherwise flashrom is used.

Raspberry Pi 4 / 400 (BCM2711)

flashrom is disabled by default because the SPI GPIOs are shared with the analog audio output. To enable it, set RPI_EEPROM_IMMEDIATE_UPDATE=1 in /etc/default/rpi-eeprom-update and add the following to config.txt (this moves analog audio to GPIO 12/13 and may be incompatible with some HATs):

dtparam=spi=on
dtoverlay=audremap
dtoverlay=spi-gpio40-45

Compute Module 4 / 4S (BCM2711)

rpi-eeprom-update is disabled by default on CM4/CM4S — the recommended update path is usbboot. To use flashrom instead, add the following to /etc/default/rpi-eeprom-update:

RPI_EEPROM_IMMEDIATE_UPDATE=1
CM4_ENABLE_RPI_EEPROM_UPDATE=1

…and the following to config.txt:

[cm4]
dtparam=spi=on
dtoverlay=audremap
dtoverlay=spi-gpio40-45

For CM4S, replace [cm4] with [cm4s] and add dtparam=enable_eeprom=on.

Minimum bootloader version (MIN_BOOT_VER)

Newer Raspberry Pi boards may depend on bootloader fixes for hardware that did not exist when older EEPROM releases were built — for example new SDRAM part numbers, revised power-supply sequencing or PMIC behaviour. Installing an EEPROM image that pre-dates the board can leave it unable to boot reliably (or at all).

To prevent this, the board manufacture process programs a minimum bootloader version into the device, exposed by the firmware in the device tree at /proc/device-tree/chosen/rpi-min-boot-ver. Each EEPROM image embeds a corresponding MFG_VER: field. rpi-eeprom-update compares the two and warns when the candidate image's MFG_VER is older than the board's minimum:

WARNING: Bootloader image version MFG_VER: <image> is older than the board manufacture version (<min>).

The warning is advisory by default — the update still proceeds. Set STRICT_MIN_VER_CHECK=1 in /etc/default/rpi-eeprom-update to turn this into a hard error so a downgrade onto unsupported hardware is refused rather than merely flagged. A similar check is also applied against the installed rpi-eeprom package version: if the package is too old for the board, rpi-eeprom-update prompts the user to apt upgrade rpi-eeprom.

Support

Please check the Raspberry Pi general discussion forum if you have a support question.

Reset to factory defaults

To reset the bootloader back to factory defaults use Raspberry Pi Imager to write an EEPROM update image to a spare SD card. Select Misc utility images under the Operating System tab.

Bootloader documentation

• Config.txt boot options
• Bootloader EEPROM
• Bootloader configuration
• Updating the Compute Module 4 bootloader
• Releases and release notes