rpi-eeprom-update

#!/bin/sh

# Raspberry Pi4 boot EEPROM updater.

set -e

script_dir=$(cd "$(dirname "$0")" && pwd)

if [ -f /etc/default/rpi-eeprom-update ]; then
   . /etc/default/rpi-eeprom-update
fi

FIRMWARE_ROOT=${FIRMWARE_ROOT:-/lib/firmware/raspberrypi/bootloader}
# May be used to select beta releases instead of the default critical
# updates.
FIRMWARE_RELEASE_STATUS=${FIRMWARE_RELEASE_STATUS:-critical}
FIRMWARE_IMAGE_DIR=${FIRMWARE_IMAGE_DIR:-${FIRMWARE_ROOT}/${FIRMWARE_RELEASE_STATUS}}
FIRMWARE_BACKUP_DIR=${FIRMWARE_BACKUP_DIR:-/var/lib/raspberrypi/bootloader/backup}
ENABLE_VL805_UPDATES=${ENABLE_VL805_UPDATES:-1}
USE_FLASHROM=${USE_FLASHROM:-0}
RECOVERY_BIN=${RECOVERY_BIN:-${FIRMWARE_ROOT}/${FIRMWARE_RELEASE_STATUS}/recovery.bin}
BOOTFS=${BOOTFS:-/boot}
VCMAILBOX=${VCMAILBOX:-/opt/vc/bin/vcmailbox}

EXIT_SUCCESS=0
EXIT_UPDATE_REQUIRED=1
EXIT_FAILED=2
EXIT_EEPROM_FROZEN=3
# Reserved
# EXIT_PREVIOUS_UPDATE_FAILED=4

OVERWRITE_CONFIG=0
# Maximum safe SPI speed for EEPROM access 16000, slower is ok.
SPI_SPEED=16000
# Timestamp for first release which doesn't have a timestamp field
BOOTLOADER_FIRST_VERSION=1557513636
EEPROM_SIZE=524288

# Simple bootloader which is able to load start.elf in the event of a power
# cut. This runs SDRAM at low speed and may have reduced functionality but
# should be enough to run flashrom again.

TMP_EEPROM_IMAGE=""
TMP_BOOTFS_MNT=""

VL805_CURRENT_VERSION=
VL805_UPDATE_VERSION=

# The update actions selected by the version check
ACTION_UPDATE_BOOTLOADER=0
ACTION_UPDATE_VL805=0

cleanup() {
   if [ -f "${TMP_EEPROM_IMAGE}" ]; then
      rm -f "${TMP_EEPROM_IMAGE}"
   fi
   if [ -f "${TMP_EEPROM_CONFIG}" ]; then
      rm -f "${TMP_EEPROM_CONFIG}"
   fi
   if [ -f "${NEW_EEPROM_CONFIG}" ]; then
      rm -f "${NEW_EEPROM_CONFIG}"
   fi
   if [ -d "${TMP_BOOTFS_MNT}" ]; then
      umount "${TMP_BOOTFS_MNT}"
      rmdir "${TMP_BOOTFS_MNT}"
   fi
   TMP_BOOTFS_MNT=
   TMP_EEPROM_IMAGE=
   TMP_EEPROM_CONFIG=
   NEW_EEPROM_CONFIG=
}
trap cleanup EXIT

die() {
   echo "$@" >&2
   exit ${EXIT_FAILED}
}

prepareImage()
{
   [ -f "${BOOTLOADER_UPDATE_IMAGE}" ] || die "EEPROM image \'${BOOTLOADER_UPDATE_IMAGE}\' not found"
   TMP_EEPROM_IMAGE="$(mktemp)"
   TMP_EEPROM_CONFIG="$(mktemp)"
   NEW_EEPROM_CONFIG="$(mktemp)"

   mkdir -p "${FIRMWARE_BACKUP_DIR}"

   # Backup the configuration of the currently loaded bootloader
   vcgencmd bootloader_config > "${TMP_EEPROM_CONFIG}"
   backup="${FIRMWARE_BACKUP_DIR}/pieeprom-backup-$(date +%Y%m%d-%H%M%S).conf"
   cp -f "${TMP_EEPROM_CONFIG}" "${backup}"

   if [ -x "${EEPROM_CONFIG_HOOK}" ]; then
      echo "Running EEPROM config hook ${EEPROM_CONFIG_HOOK}"
      if ! "${EEPROM_CONFIG_HOOK}" -u "${BOOTLOADER_UPDATE_IMAGE}" < "${TMP_EEPROM_CONFIG}" > "${NEW_EEPROM_CONFIG}"; then
         echo "EEPROM config hook \"${EEPROM_CONFIG_HOOK}\"  failed. Using original configuration"
         cp -f "${TMP_EEPROM_CONFIG}" "${NEW_EEPROM_CONFIG}"
      fi
   else
      cp -f "${TMP_EEPROM_CONFIG}" "${NEW_EEPROM_CONFIG}"
   fi

   if [ "$(wc -l "${NEW_EEPROM_CONFIG}" | awk '{print $1}')" -lt 3 ]; then
      # Don't propagate empty EEPROM config files and also prevent the initial
      # bootloader config with WAKE_ON_GPIO=0 propgating to newer versions by
      # accident.
      OVERWRITE_CONFIG=1
   fi

   cp -f "${BOOTLOADER_UPDATE_IMAGE}" "${TMP_EEPROM_IMAGE}"

   if [ "${OVERWRITE_CONFIG}" = 0 ]; then
      "${script_dir}/rpi-eeprom-config" \
         --out "${TMP_EEPROM_IMAGE}" \
         --config "${NEW_EEPROM_CONFIG}" "${BOOTLOADER_UPDATE_IMAGE}"
   fi
}

applyRecoveryUpdate()
{
   [ -n "${BOOTLOADER_UPDATE_IMAGE}" ] || [ -n "${VL805_UPDATE_IMAGE}" ] || die "No update images specified"

   findBootFS

   # A '.sig' file is created so that recovery.bin can check that the
   # EEPROM image has not been created (e.g. SD card corruption).
   # The .sig file format is currently just a SHA256 in ASCII hex. In future,
   # if an actual public key signature is required then that plus any other
   # data would be appended after the SHA256 signature.
   if [ -n "${BOOTLOADER_UPDATE_IMAGE}" ]; then
        [ -f "${BOOTLOADER_UPDATE_IMAGE}" ] || die "${BOOTLOADER_UPDATE_IMAGE} not found"

        TMP_EEPROM_IMAGE="$(mktemp)"
        prepareImage
        # If recovery.bin encounters pieeprom.upd then it will select it in
        # preference to pieeprom.bin. The .upd file also causes recovery.bin
        # to rename itself to recovery.000 and reboot if the update is successful.
        # The rename causes the ROM to ignore this file and use the newly flashed
        # EEPROM image instead.
        sha256sum "${TMP_EEPROM_IMAGE}" | awk '{print $1}' > "${BOOTFS}/pieeprom.sig" \
                || die "Failed to create ${BOOTFS}/pieeprom.sig"

        cp -f "${TMP_EEPROM_IMAGE}" "${BOOTFS}/pieeprom.upd" \
                || die "Failed to copy ${TMP_EEPROM_IMAGE} to ${BOOTFS}"
   fi

   if [ -n "${VL805_UPDATE_IMAGE}" ]; then
        sha256sum "${VL805_UPDATE_IMAGE}" | awk '{print $1}' > "${BOOTFS}/vl805.sig" \
                || die "Failed to create ${BOOTFS}/vl805.sig"
        cp -f "${VL805_UPDATE_IMAGE}" "${BOOTFS}/vl805.bin"
   fi

   cp -f "${RECOVERY_BIN}" "${BOOTFS}/recovery.bin" \
      || die "Failed to copy ${RECOVERY_BIN} to ${BOOTFS}"
}

applyUpdate() {
   checksums_file="/var/lib/dpkg/info/rpi-eeprom-images.md5sums"

   [ "$(id -u)" = "0" ] || die "* Must be run as root - try 'sudo rpi-eeprom-update'"

   if [ "${IGNORE_DPKG_CHECKSUMS}" = 0 ] && [ -f "${checksums_file}" ]; then
      (
         cd /
         if ! md5sum -c "${checksums_file}" > /dev/null 2>&1; then
            md5sum -c "${checksums_file}"
            die "rpi-eeprom-images checksums failed - try reinstalling this package"
         fi
      )
   fi

   if [ "${USE_FLASHROM}" = 0 ]; then
      applyRecoveryUpdate
      return
   fi

   if [ -f "${BOOTLOADER_UPDATE_IMAGE}" ]; then
      # Bootloader EEPROM chip-select is muxed with audio pin so disable audio
      # LDO first to avoid sending noise to analog audio.
      "${VCMAILBOX}" 0x00030056 4 4 0 > /dev/null || true
      dtparam audio=off

      # Switch the SPI pins to boot EEPROM
      dtoverlay spi-gpio40-45
      modprobe spidev
      modprobe spi-bcm2835

      prepareImage "${BOOTLOADER_UPDATE_IMAGE}"

      echo "Applying bootloaer update ${BOOTLOADER_UPDATE_IMAGE}"
      flashrom -p "linux_spi:dev=/dev/spidev0.0,spispeed=${SPI_SPEED}" -w "${TMP_EEPROM_IMAGE}" || die "flashrom EEPROM update failed"

      dtparam -R spi-gpio40-45
      dtparam audio=on
      ${VCMAILBOX} 0x00030056 4 4 1 > /dev/null || true
   fi

   if [ -f "${VL805_UPDATE_IMAGE}" ]; then
      echo "Applying VL805 image ${VL805_UPDATE_IMAGE}"
      vl805 -w "${VL805_UPDATE_IMAGE}"
   fi

   echo "Applying bootloader update ${BOOTLOADER_UPDATE_IMAGE}"
}

# Use the version reported by the loaded EEPROM instead of attempting to retrieve
# this via flashrom to avoid unnecessary audio glitches.
BOOTLOADER_CURRENT_VERSION=
getBootloaderCurrentVersion() {
   if vcgencmd bootloader_version | grep -q timestamp; then
      BOOTLOADER_CURRENT_VERSION=$(vcgencmd bootloader_version | grep timestamp | awk '{print $2}')
      if [ "${BOOTLOADER_CURRENT_VERSION}" = "0" ]; then
         # If a timestamp of zero is returned then it's new firmware but an
         # old bootloader. Assume bootloader v0
         BOOTLOADER_CURRENT_VERSION="${BOOTLOADER_FIRST_VERSION}"
      fi
   else
      # New bootloader / old firmware ? Try to parse the date
      BOOTLOADER_CURRENT_VERSION=$(date -u +%s --date "$(vcgencmd bootloader_version | head -n1)" 2>/dev/null || true)
   fi

   # Failed to parse the version. Default to the initial production release.
   if [ -z "${BOOTLOADER_CURRENT_VERSION}" ]; then
      BOOTLOADER_CURRENT_VERSION="${BOOTLOADER_FIRST_VERSION}"
   fi
}

# Find latest applicable update version
BOOTLOADER_UPDATE_IMAGE=""
BOOTLOADER_UPDATE_VERSION=0
getBootloaderUpdateVersion() {
   BOOTLOADER_UPDATE_VERSION=0
   match=".*/pieeprom-[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9].bin"
   latest="$(find "${FIRMWARE_IMAGE_DIR}" -maxdepth 1 -type f -size "${EEPROM_SIZE}c" -regex "${match}" | sort -r | head -n1)"
   if [ -f "${latest}" ]; then
      BOOTLOADER_UPDATE_VERSION=$(strings "${latest}" | grep BUILD_TIMESTAMP | sed 's/.*=//g')
      BOOTLOADER_UPDATE_IMAGE="${latest}"
   fi
}

checkDependencies() {
   rev="$(sed -n '/^Revision/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo)"
   if [ $(((0x$rev >> 23) & 1)) -ne 0 ] && [ $(((0x$rev >> 12) & 15)) -eq 3 ]; then
      echo "BCM2711 detected"
   else
      # Not a BCM2711, no EEPROMs to update.
      exit ${EXIT_SUCCESS}
   fi

   if ! command -v vcgencmd  > /dev/null; then
      die "vcgencmd not found. On Debian, try installing the libraspberrypi-bin package."
   fi

   if [ ! -d "${FIRMWARE_IMAGE_DIR}" ]; then
      die "EEPROM updates directory ${FIRMWARE_IMAGE_DIR} not found."
   fi

   if ! command -v vl805 > /dev/null; then
      die "vl805 command not found. On Debian, try reinstalling the rpi-eeprom package."
   fi 

   if vcgencmd bootloader_config | grep -qi "Command not registered"; then
      die "vcgencmd: 'bootloader_config' command not supported. Please update VC firmware and reboot."
   fi

   if ! command -v sha256sum > /dev/null; then
      die "sha256sum not found. On Debian, try installing the coreutilities package"
   fi

   if ! command -v flashrom  > /dev/null && [ "${USE_FLASHROM}" = 1 ]; then
      die "flashrom not found. On Debian, try installing the flashrom package."
   fi

   if [ ! -x "${VCMAILBOX}" ] && [ "${USE_FLASHROM}" = 1 ]; then
      die "vcmailbox not found. On Debian, try installing the libraspberrypi-bin package."
   fi

   if ! command -v dtparam > /dev/null && [ "${USE_FLASHROM}" = 1 ]; then
      die "dtparam not found. On Debian, try installing the libraspberrypi-bin package."
   fi

   if ! command -v dtoverlay > /dev/null && [ "${USE_FLASHROM}" = 1 ]; then
      die "dtoverlay not found. On Debian, try installing the libraspberrypi-bin package."
   fi

   if [ "${USE_FLASHROM}" = 0 ] && [ ! -f "${RECOVERY_BIN}" ]; then
      die "${RECOVERY_BIN} not found."
   fi
}

usage() {
cat <<EOF
rpi-eeprom-update [options]... [FILE]

Checks whether the Raspberry Pi bootloader and the VL805 USB controller
EEPROMs are up-to-date and optionally updates the EEPROMs at the next reboot.

The default update mechanism writes recovery.bin and the EEPROM update
image(s) (pieeprom.upd and vl805.bin) to the boot partition on the sd-card.
The SHA256 hash of the corresponding images are written to pieeprom.sig
and/or vl805.sig. This guards against file system corruption which could
cause the EEPROM to be flashed with an invalid image. This is not a
security check.

At the next reboot the ROM runs recovery.bin which updates EEPROM(s).
If the update was successful recovery.bin renames itself to recovery.000
to prevent it from running a second time then resets the system.
The system should then boot normally.

If /boot does not correspond to the boot partition on the sd-card and this
is not a NOOBS system then the mount point for BOOTFS should be defined
in /etc/default/rpi-eeprom-update by defining the BOOTFS variable.

A backup of the current EEPROM config file is written to ${FIRMWARE_BACKUP_DIR}
before applying the update.

Options:
   -a Automatically install bootloader and USB (VLI) EEPROM updates.
   -A Specify which type of EEPROM to automatically update (vl805 or bootloader)
   -d Use the default bootloader config instead of migrating the current settings
   -f Install the given file instead of the latest applicable update
      Ignores the FREEZE_VERSION flag in bootloader and is intended for manual
      firmware updates.
      WARNING: This command should only be run from console mode in order to
      avoid conflicts/deadlock with dtoverlay/dtparam settings.
   -h Display help text and exit
   -i Ignore package checksums - for rpi-eeprom developers.
   -j Write status information using JSON notation
   -m Write status information to the given file when run without -a or -f
   -r Removes temporary EEPROM update files from the boot partition.
   -u Install the specified VL805 (USB EEPROM) image file.

Environment:
Environment variables should be defined in /etc/default/rpi-eeprom-update

EEPROM_CONFIG_HOOK

Specifies the path of an optional script which post-processes the
configuration file before it is applied to the new image. The modified
output must contain at least 3 lines and should contain WAKE_ON_GPIO
and POWER_OFF_ON_HALT settings.

USE_FLASHROM

The flashrom update mechanism may be enabled by setting USE_FLASHROM=1. This
also selects the vl805 tool instead of using recovery.bin to perform the
update. This may be desirable if an immediate update is required or if an
sd-card is not present.
However, this not recommended because the SPI pins are muxed with audio and other
device drivers may be using SPI (e.g. HATs). This is also not safe in the
event of a power failure during the update of the EEPROM.
Changing the VL805 firmware whilst USB devices are attached may also cause
those devices to stop working until after the system is reboot.

Examples:
To extract the configuration file from an EEPROM image:
   rpi-eeprom-config pieeprom.bin --out bootconf.txt

To update the configuration file in an EEPROM image:
   rpi-eeprom-config pieeprom.bin --config bootconf.txt --out pieeprom-new.bin

To flash the new image:
   sudo rpi-eeprom-update -d -f ./pieeprom-new.bin

The syntax is the same as config.txt See online documentation for the list of parameters.

The official documentation for the Raspberry Pi bootloader EEPROM is available at
https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md

EOF
  exit ${EXIT_SUCCESS}
}

printVersions()
{
   if [ "${ACTION_UPDATE_BOOTLOADER}" = 1 ]; then
      echo "BOOTLOADER: update required"
   else
      echo "BOOTLOADER: up-to-date"
   fi

   echo "CURRENT: $(date -u "-d@${BOOTLOADER_CURRENT_VERSION}") (${BOOTLOADER_CURRENT_VERSION})"
   echo " LATEST: $(date -u "-d@${BOOTLOADER_UPDATE_VERSION}") (${BOOTLOADER_UPDATE_VERSION})"

   if [ "${ACTION_UPDATE_VL805}" = 1 ]; then
      echo "VL805: update required"
   else
      if [ "$(id -u)" = "0" ]; then
         echo "VL805: up-to-date"
      else
         echo "VL805: version unknown. Try sudo rpi-eeprom-update"
      fi
   fi

   echo "CURRENT: ${VL805_CURRENT_VERSION}"
   echo " LATEST: ${VL805_UPDATE_VERSION}"
}

findBootFS()
{
   # recovery.bin is loaded by the ROM from the boot partition, this is normally
   # ${BOOTFS} but on NOOBS this is /dev/mmcblk0p1 with volume label RECOVERY
   # If ${BOOTFS} is not writable OR is not on /dev/mmcblk0 then error because the ROM
   # can only load recovery.bin from the on-board SD-CARD slot or the EEPROM.

   if blkid | grep -qE "/dev/mmcblk0p1.*LABEL_FATBOOT.*RECOVERY.*TYPE.*vfat"; then
      TMP_BOOTFS_MNT="$(mktemp -d)"
      mount /dev/mmcblk0p1 "${TMP_BOOTFS_MNT}"
      BOOTFS="${TMP_BOOTFS_MNT}"
   fi

   # If BOOTFS is not a directory or doesn't contain any .elf files then
   # it's probably not the boot partition.
   [ -d "${BOOTFS}" ] || die "BOOTFS: \"${BOOTFS}\" is not a directory"
   [ "$(find "${BOOTFS}/" -name "*.elf" | wc -l)" -gt 0 ] || die "BOOTFS: \"${BOOTFS}\" contains no .elf files"
}

getVL805CurrentVersion()
{
   # The version number is obtained by examing a section of PCI config
   # space which is only accessible as root. If the command is not run as
   # root then treat the version as unknown and skip VLI updates.
   VL805_CURRENT_VERSION=""
   if [ "$(id -u)" = "0" ]; then
      if command -v lspci >/dev/null; then
         vlver="$(lspci -d 1106:3483 -xxx | awk '/^50:/ { print "VL805 FW version: " $5 $4 $3 $2 }')"
      else
         vlver="$(vl805 | grep "VL805 FW version")"
      fi
      if [ -n "${vlver}" ]; then
         VL805_CURRENT_VERSION="${vlver#*: }"
      fi
   fi
}

getVL805UpdateVersion()
{
   # The latest VL805 version is indicated by a file containing the version
   # number. If the version file exists then verify that the corresponding
   # VL805 binary exists before selecting it.
   # There are no user modifiable sections in the VL805 firmware and there 
   # are unlikely to be many updates to it so just indicate the latest supported
   # version. This also avoids making any assumptions about the VLI version numbers.
   VL805_UPDATE_VERSION=""
   if [ -f "${FIRMWARE_IMAGE_DIR}/vl805.latest" ]; then
      ver="$(cat "${FIRMWARE_IMAGE_DIR}/vl805.latest")"
      if [ -f "${FIRMWARE_IMAGE_DIR}/vl805-${ver}.bin" ]; then
         VL805_UPDATE_VERSION="${ver}"
         VL805_UPDATE_IMAGE="${FIRMWARE_IMAGE_DIR}/vl805-${ver}.bin"
      fi
   fi
}

# Retrieve the version information and determine whether newer
# versions are available.
lookupVersionInfo()
{
   getBootloaderCurrentVersion
   getBootloaderUpdateVersion

   getVL805CurrentVersion
   getVL805UpdateVersion

   if [ "${BOOTLOADER_UPDATE_VERSION}" -gt "${BOOTLOADER_CURRENT_VERSION}" ]; then
      ACTION_UPDATE_BOOTLOADER=1
   else
      BOOTLOADER_UPDATE_IMAGE=""
   fi

   if [ -n "${VL805_CURRENT_VERSION}" ] && [ -n "${VL805_UPDATE_VERSION}" ]; then
      if [ "${VL805_CURRENT_VERSION}" != "${VL805_UPDATE_VERSION}" ]; then
         ACTION_UPDATE_VL805=1
      else
         VL805_UPDATE_IMAGE=""
      fi
   fi
}

checkAndApply()
{
   lookupVersionInfo
   removePreviousUpdates

   # Restrict the automatic updates to the EEPROM types selected by the -A option.
   if [ "${AUTO_UPDATE_VL805}" != 1 ]; then
      ACTION_UPDATE_VL805=0
      VL805_UPDATE_IMAGE=""
   fi
   if [ "${AUTO_UPDATE_BOOTLOADER}" != 1 ]; then
      ACTION_UPDATE_BOOTLOADER=0
      BOOTLOADER_UPDATE_IMAGE=""
   fi

   if [ "${ACTION_UPDATE_BOOTLOADER}" = 1 ] || [ "${ACTION_UPDATE_VL805}" = 1 ]; then
      echo "*** INSTALLING EEPROM UPDATES ***"
      printVersions
      applyUpdate
      echo "EEPROM updates pending. Please reboot to apply the update."
   else
      printVersions
   fi
}

fileUpdate()
{
   removePreviousUpdates
   echo "*** INSTALLING ${BOOTLOADER_UPDATE_IMAGE} ${VL805_UPDATE_IMAGE} ***"

   if [ -n "${BOOTLOADER_UPDATE_IMAGE}" ]; then
      [ -f "${BOOTLOADER_UPDATE_IMAGE}" ] || die "Bootloader image \"${BOOTLOADER_UPDATE_IMAGE}\" not found"
   fi

   if [ -n "${VL805_UPDATE_IMAGE}" ]; then
      [ -f "${VL805_UPDATE_IMAGE}" ] || die "VL805 image \"${VL805_UPDATE_IMAGE}\" not found"
   fi

   applyUpdate
   echo "EEPROM update pending. Please reboot to apply the update."
}

removePreviousUpdates()
{
   if [ "$(id -u)" = "0" ]; then
      findBootFS

      # Remove any stale recovery.bin files or EEPROM images
      # N.B. recovery.bin is normally ignored by the ROM if is not a valid
      # executable but it's best to not have the file at all.
      rm -f "${BOOTFS}/recovery.bin"
      rm -f "${BOOTFS}/pieeprom.bin" "${BOOTFS}/pieeprom.upd" "${BOOTFS}/pieeprom.sig"
      rm -f "${BOOTFS}/vl805.bin" "${BOOTFS}/vl805.sig"
      # Case insensitive for FAT bootfs
      find "${BOOTFS}" -maxdepth 1 -type f -iname "recovery.*" -regex '.*\.[0-9][0-9][0-9]$' -exec rm -f {} \;
   fi
}

checkVersion()
{
   lookupVersionInfo

   if [ "${BOOTLOADER_UPDATE_VERSION}" -gt "${BOOTLOADER_CURRENT_VERSION}" ]; then
      echo "*** UPDATE REQUIRED ***"
      printVersions
      write_status_info "EXIT_UPDATE_REQUIRED"
      exit ${EXIT_UPDATE_REQUIRED}
   else
      printVersions
      write_status_info "EXIT_SUCCESS"
      exit ${EXIT_SUCCESS}
   fi
}

write_status_info()
{
   [ -z "${MACHINE_OUTPUT}" ] && return 0

   exit_code="${1:-EXIT_FAILED}"
   bootloader_cur="${BOOTLOADER_CURRENT_VERSION:-0}"
   bootloader_new="${BOOTLOADER_UPDATE_VERSION:-0}"
   vl805_cur="${VL805_CURRENT_VERSION}"
   vl805_new="${VL805_UPDATE_VERSION}"

    if [ "${JSON_OUTPUT}" = "no" ]; then
      cat > "${MACHINE_OUTPUT}" <<EOF
EXITCODE="${exit_code}"
BOOTLOADER_CURRENT=${bootloader_cur}
BOOTLOADER_LATEST=${bootloader_new}
VL805_CURRENT="${vl805_cur}"
VL805_LATEST="${vl805_new}"
EOF
   else
      cat > "${MACHINE_OUTPUT}" <<EOF
{
  "EXITCODE": "${exit_code}",
  "BOOTLOADER_CURRENT": ${bootloader_cur},
  "BOOTLOADER_LATEST": ${bootloader_new},
  "VL805_CURRENT": "${vl805_cur}",
  "VL805_LATEST": "${vl805_new}"
}
EOF
   fi
   return 0
}

AUTO_UPDATE_BOOTLOADER=0
AUTO_UPDATE_VL805=0
MACHINE_OUTPUT=""
JSON_OUTPUT="no"
IGNORE_DPKG_CHECKSUMS=0

while getopts A:adhif:m:ju:r option; do
   case "${option}" in
   A)
      if [ "${OPTARG}" = "bootloader" ]; then
         AUTO_UPDATE_BOOTLOADER=1
      elif [ "${OPTARG}" = "vl805" ]; then
         AUTO_UPDATE_VL805=1
      else
         die "Unknown update mode: ${OPTARG}"
      fi
      ;;
   a) AUTO_UPDATE_BOOTLOADER=1
      AUTO_UPDATE_VL805=1
      ;;
   d) OVERWRITE_CONFIG=1
      ;;
   f) BOOTLOADER_UPDATE_IMAGE="${OPTARG}"
      ;;
   i) IGNORE_DPKG_CHECKSUMS=1
      ;;
   j) JSON_OUTPUT="yes"
      ;;
   m) MACHINE_OUTPUT="${OPTARG}"
      ;;
   h) usage
      ;;
   r) [ "$(id -u)" = "0" ] || die "* Must be run as root - try 'sudo rpi-eeprom-update -r'"
      echo "Removing temporary files from previous EEPROM update"
      removePreviousUpdates
      exit 0
      ;;
   u) VL805_UPDATE_IMAGE="${OPTARG}"
      ;;
   *) echo "Unknown argument \"${option}\""
      usage
      ;;
   esac
done

checkDependencies
if [ "${AUTO_UPDATE_BOOTLOADER}" = 1 ] || [ "${AUTO_UPDATE_VL805}" = 1 ]; then
   if vcgencmd bootloader_config | grep FREEZE_VERSION=1; then
      echo "EEPROM version is frozen. Skipping update"
      exit ${EXIT_EEPROM_FROZEN}
   else
      checkAndApply
   fi
elif [ -n "${BOOTLOADER_UPDATE_IMAGE}" ] || [ -n "${VL805_UPDATE_IMAGE}" ]; then
   fileUpdate
else
   checkVersion
fi