Pieeprom flashrom or selfupdate #1314
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,144 @@ | ||
| # Flashrom-based EEPROM update for Raspberry Pi 4 | ||
| # Usage: pieeprom-flashrom.sh [firmware_image] | ||
| # | ||
| # This script handles the low-level SPI flashrom update. | ||
| # It is called by pieeprom-update.sh when self-update is not available, | ||
| # or can be invoked directly. | ||
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| set -o errexit | ||
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| # shellcheck disable=SC1091 | ||
| . /usr/libexec/os-helpers-logging | ||
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| NEW_IMG="${1:-pieeprom.upd}" | ||
| CURR_IMG=pieeprom-current.bin.tmp | ||
| CURR_IMG_PATH=/tmp | ||
| NEW_IMG_PATH=/mnt/boot | ||
| SPI_SPEED=16000 | ||
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| # Unbind a device from a driver | ||
| # Usage: device=$(driver_unbind <driver_path> <device_pattern>) | ||
| # Returns: device name on stdout if successful, empty string if not found | ||
| # Exits: using fail function if multiple devices found or unbind operation fails | ||
| driver_unbind() { | ||
| driver_path="${1}" | ||
| device_pattern="${2}" | ||
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| if [ ! -d "${driver_path}" ]; then | ||
| echo "" | ||
| return | ||
| fi | ||
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| devices="$(find "${driver_path}" -maxdepth 1 -type l -name "${device_pattern}" 2>/dev/null)" | ||
| device_count="$(echo "${devices}" | grep -c . || true)" | ||
| if [ "${device_count}" -gt 1 ]; then | ||
| fail "Multiple devices matching ${device_pattern} found in ${driver_path}, expected exactly one" | ||
| fi | ||
| device="$(basename "$(echo "${devices}" | head -n1)" 2>/dev/null)" | ||
| if [ -z "${device}" ]; then | ||
| echo "" | ||
| return | ||
| fi | ||
| if ! echo "${device}" > "${driver_path}/unbind" 2>/dev/null; then | ||
| fail "Failed to unbind ${device} from ${driver_path}" | ||
| fi | ||
| echo "${device}" | ||
| } | ||
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| # Bind a device to a driver | ||
| # Usage: driver_bind <driver_path> <device> | ||
| # Returns: 0 on success, 1 if device is empty or driver path not found, 2 if bind fails | ||
| driver_bind() { | ||
| driver_path="${1}" | ||
| device="${2}" | ||
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| if [ -z "${device}" ]; then | ||
| warn "Device is empty, cannot bind to ${driver_path}" | ||
| return 1 | ||
| fi | ||
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| if [ ! -d "${driver_path}" ]; then | ||
| warn "Driver path ${driver_path} not found, skipping bind" | ||
| return 1 | ||
| fi | ||
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| if ! echo "${device}" > "${driver_path}/bind" 2>/dev/null; then | ||
| warn "Failed to bind ${device} to ${driver_path}" | ||
| return 2 | ||
| fi | ||
| } | ||
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| # SPI driver helpers (required - script fails if SPI device not found) | ||
| SPI_DRIVER_PATH="/sys/bus/platform/drivers/spi-bcm2835" | ||
| spi_unbind() { | ||
| driver_unbind "${SPI_DRIVER_PATH}" "*.spi" | ||
| } | ||
| spi_bind() { | ||
| driver_bind "${SPI_DRIVER_PATH}" "${1}" | ||
| } | ||
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| # VCHIQ driver helpers (optional - unbind releases GPIO pins used by audio | ||
| # to avoid pinctrl conflicts with SPI on GPIO 40-45) | ||
| # WARNING: VCHIQ cannot be rebound at runtime due to firmware limitations, | ||
| # audio/camera will be unavailable until reboot if unbound. | ||
| VCHIQ_DRIVER_PATH="/sys/bus/platform/drivers/bcm2835_vchiq" | ||
| vchiq_unbind() { | ||
| driver_unbind "${VCHIQ_DRIVER_PATH}" "*.mailbox" | ||
| } | ||
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| SPI_DEVICE=$(spi_unbind) | ||
| if [ -z "${SPI_DEVICE}" ]; then | ||
| fail "SPI device not found or failed to unbind, cannot proceed with EEPROM update" | ||
| fi | ||
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| /usr/bin/vcmailbox 0x00030056 4 4 0 > /dev/null || true | ||
| /usr/bin/dtparam -d /mnt/boot/overlays/ audio=off | ||
| /usr/bin/dtoverlay -d /mnt/boot/overlays/ spi-gpio40-45 | ||
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| # Try binding SPI; if it fails (pinctrl conflict with VCHIQ holding GPIO 40-45), | ||
| # unbind VCHIQ and retry. VCHIQ cannot be rebound at runtime, so audio/camera | ||
| # will be unavailable until reboot. | ||
| VCHIQ_UNBOUND=0 | ||
| if ! spi_bind "$SPI_DEVICE"; then | ||
| warn "Unbinding VCHIQ to release GPIO 40-45 (audio/camera will be unavailable until reboot)" | ||
| vchiq_unbind | ||
| VCHIQ_UNBOUND=1 | ||
| if ! spi_bind "$SPI_DEVICE"; then | ||
| fail "SPI bind failed even after VCHIQ unbind, cannot proceed" | ||
| fi | ||
| fi | ||
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| /usr/sbin/flashrom -p "linux_spi:dev=/dev/spidev0.0,spispeed=${SPI_SPEED}" --read "${CURR_IMG_PATH}/${CURR_IMG}" | ||
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| curr_eeprom_md5sum=$(md5sum "${CURR_IMG_PATH}/${CURR_IMG}" | awk '{print $1}') | ||
| new_eeprom_md5sum=$(md5sum "${NEW_IMG_PATH}/${NEW_IMG}" | awk '{print $1}') | ||
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| if [ "$curr_eeprom_md5sum" = "$new_eeprom_md5sum" ]; then | ||
| info "SPI EEPROM fw update is not necessary" | ||
| else | ||
| info "Performing SPI EEPROM fw update..." | ||
| /usr/sbin/flashrom -p "linux_spi:dev=/dev/spidev0.0,spispeed=${SPI_SPEED}" --write "${NEW_IMG_PATH}/${NEW_IMG}" | ||
| info "SPI EEPROM fw update successful" | ||
| fi | ||
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| rm "${CURR_IMG_PATH}/${CURR_IMG}" | ||
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| SPI_DEVICE=$(spi_unbind) | ||
| if [ -z "${SPI_DEVICE}" ]; then | ||
| fail "SPI device not found during cleanup, cannot restore system state" | ||
| fi | ||
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| /usr/bin/dtparam -d /mnt/boot/overlays/ -R spi-gpio40-45 | ||
| /usr/bin/dtparam -d /mnt/boot/overlays/ audio=on | ||
| /usr/bin/vcmailbox 0x00030056 4 4 1 > /dev/null || true | ||
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| if ! spi_bind "$SPI_DEVICE"; then | ||
| fail "Failed to restore SPI driver during cleanup" | ||
| fi | ||
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| # In an ideal world we would restore the mailbox, but unfortunately this is impossible | ||
| # https://github.com/raspberrypi/rpi-eeprom/issues/801#issuecomment-3859373151 | ||
| if [ "${VCHIQ_UNBOUND}" = "1" ]; then | ||
| warn "VCHIQ was unbound during EEPROM update and cannot be restored at runtime." | ||
| warn "Audio, camera and other VideoCore services will not work until the next reboot." | ||
| fi |
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Note that with this change
resin-init-flasher-boardno longer flashroms the EEPROM during provisioning. Need to check how that affects the secure boot provisioning flow.