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qualcommax: ipq50xx: functions for bootconfig partition
The BOOTCONFIG partition is used by Qualcomm's boot chain to store metadata about the device's startup configuration. It contains info such as versioning, configuration flags, primary boot partition, and more. Newer devices with dual boot partitions not only store the active boot partition in a U-boot variable but also in partition info in the BOOTCONFIG partition. As such, add library functions to set and toggle the active boot partition. Signed-off-by: George Moussalem <george.moussalem@outlook.com> Link: https://github.com/openwrt/openwrt/pull/21038 Link: https://github.com/openwrt/openwrt/pull/21273 Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
George Moussalem
Robert Marko
parent
898b1668c0
commit
46e8c1b502
1 changed files with 177 additions and 0 deletions
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. /lib/functions.sh
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PART_SIZE=20
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NAME_SIZE=16
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MAX_NUM_PARTS=16
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MAGIC_START_HEX="a0 a1 a2 a3"
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MAGIC_START_TRY_HEX="a1 a1 a2 a3"
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MAGIC_END_HEX="b0 b1 b2 b3"
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validate_bootconfig_magic() {
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local file=$1
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magic_start=$(hexdump -v -n 4 -e '4/1 "%02x "' "$file")
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magic_end=$(hexdump -v -s 332 -n 4 -e '4/1 "%02x "' "$file")
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if [ "$magic_start" != "$MAGIC_START_HEX" ] && \
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[ "$magic_start" != "$MAGIC_START_TRY_HEX" ]; then
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echo "Not a valid bootconfig file, start magic does not match" >&2
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return 1
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fi
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if [ "$magic_end" != "$MAGIC_END_HEX" ]; then
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echo "Not a valid bootconfig file, end magic does not match" >&2
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return 1
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fi
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return 0
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}
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get_bootconfig_numparts() {
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local file=$1
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numpartshex=$(hexdump -v -s 8 -n 4 -e '4/1 "%02x "' "$file")
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numparts=$(( 0x$(echo $numpartshex | awk '{print $4$3$2$1}') ))
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echo ${numparts}
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}
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get_bootconfig_partidx() {
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local file=$1
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local partname=$2
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local numparts=$(get_bootconfig_numparts "$file")
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if [ -z "$numparts" ]; then
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echo "Could not get number of partitions" >&2
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return
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fi
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if [ $numparts -gt $MAX_NUM_PARTS ]; then
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numparts=$MAX_NUM_PARTS
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fi
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for i in $(seq 0 $((numparts -1))); do
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nameoffset=$((12 + i * $PART_SIZE))
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nameraw=$(dd if="$file" bs=1 skip="$nameoffset" count=12 2>/dev/null)
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name=${nameraw//S'\x00'/}
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if [ "$partname" = "$name" ]; then
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echo $i
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fi
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done
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}
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get_bootconfig_primaryboot() {
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local file=$1
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local partname=$2
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local partidx=$(get_bootconfig_partidx "$file" "$partname")
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if ! echo "$partidx" | grep -Eq '^[0-9]+$'; then
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echo "Could not get partition index for $partname in $file" >&2
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return
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fi
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if [ "$partidx" -ge 0 ] && [ "$partidx" -lt $MAX_NUM_PARTS ]; then
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offset=$((12 + $partidx * $PART_SIZE + $NAME_SIZE))
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primaryboothex=$(hexdump -v -s "$offset" -n 4 -e '4/1 "%02x "' $file)
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primaryboot=$(( 0x$(echo $primaryboothex | awk '{print $4$3$2$1}') ))
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echo $primaryboot
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fi
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}
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_set_bootconfig_primaryboot() {
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local file=$1
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local partname=$2
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local primaryboot=$3
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local primaryboothex
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local partidx
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local primarybootoffset
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partidx=$(get_bootconfig_partidx "$file" "$partname")
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if ! echo "$partidx" | grep -Eq '^[0-9]+$'; then
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echo "Could not get partition index for $2" >&2
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return 1
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fi
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primarybootoffset=$((12 + $partidx * $PART_SIZE + $NAME_SIZE))
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case "$primaryboot" in
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0)
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printf "\x00\x00\x00\x00" | dd of="$file" seek="$primarybootoffset" bs=1 count=4 conv=notrunc 2>/dev/null
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;;
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1)
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printf "\x01\x00\x00\x00" | dd of="$file" seek="$primarybootoffset" bs=1 count=4 conv=notrunc 2>/dev/null
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;;
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*)
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echo "invalid argument: primaryboot must be 0 or 1" >&2
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return 1
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;;
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esac
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}
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set_bootconfig_primaryboot() {
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local file=$1
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local partname=$2
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local primaryboot=$3
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[ -z "$file" ] || [ -z "$partname" ] || [ -z "$primaryboot" ] && {
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echo "usage: $0 <file> <partition name> <0|1>"
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return 1
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}
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[ ! -e "$file" ] && {
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echo "file $file not found" >&2
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return 1
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}
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[ ! -w $file ] && {
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echo "file $file not writable" >&2
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return 1
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}
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validate_bootconfig_magic "$file"
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[ $? -ne 0 ] && return 1
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_set_bootconfig_primaryboot $file $partname $primaryboot
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[ $? -ne 0 ] && return 1
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return 0
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}
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toggle_bootconfig_primaryboot() {
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local file=$1
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local partname=$2
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local primaryboot
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[ -z "$file" ] || [ -z "$partname" ] && {
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echo "usage: $0 <file> <partition name>"
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return 1
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}
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[ ! -e "$file" ] && {
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echo "file $file not found" >&2
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return 1
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}
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[ ! -w $file ] && {
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echo "file $file not writable" >&2
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return 1
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}
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validate_bootconfig_magic "$file"
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[ $? -ne 0 ] && return 1
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primaryboot=$(get_bootconfig_primaryboot "$1" "$2")
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case "$primaryboot" in
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0)
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_set_bootconfig_primaryboot "$1" "$2" 1
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;;
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1)
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_set_bootconfig_primaryboot "$1" "$2" 0
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;;
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*)
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echo "invalid value: primaryboot must be 0 or 1" >&2
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return 1
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;;
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esac
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[ $? -ne 0 ] && return 1
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return 0
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}
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