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fix(rauc): remove BF_BOOTSEL, boot from partition 1

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Pi 5 bootloader needs config.txt on partition 1. Old layout had
BF_BOOTSEL there with only autoboot.txt. Now 5 partitions:
BF_BOOT_A(1), BF_BOOT_B(2), BF_ROOT_A(3), BF_ROOT_B(4), BF_DATA(5).
autoboot.txt on each boot partition for A/B tryboot switching.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Mitchell R 2026-05-24 06:06:52 +02:00
parent d7f3b12488
commit 1ff0f9928c
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1 changed files with 43 additions and 43 deletions
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86
deploy/rauc/repartition-image.sh
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@ -1,8 +1,12 @@
#!/usr/bin/env bash
# Convert a stock pi-gen .img.xz (2-partition: boot + root) into a RAUC
# A/B image (6 partitions: BF_BOOTSEL + BF_BOOT_A + BF_BOOT_B + BF_ROOT_A
# + BF_ROOT_B + BF_DATA). Also emits the raw rootfs.ext4 and bootfs.vfat
# slot images that the .raucb bundle builder consumes.
# A/B image (5 partitions: BF_BOOT_A + BF_BOOT_B + BF_ROOT_A + BF_ROOT_B
# + BF_DATA). Also emits the raw rootfs.ext4 and bootfs.vfat slot images
# that the .raucb bundle builder consumes.
#
# Pi 5 tryboot: autoboot.txt goes ON the boot partition (not a separate
# selector). Bootloader reads config.txt + autoboot.txt from partition 1.
# On tryboot, switches to partition 2 (BF_BOOT_B).
#
# Avoids losetup -fP (kernel partition scanning fails on some CI runners).
# Instead, parses partition offsets from sfdisk -J and uses dd skip/count.
@ -85,32 +89,51 @@ losetup -d "$ROOTFS_LOOP"
echo "==> Labeling rootfs.ext4 as BF_ROOT_A"
e2label "$WORK/rootfs.ext4" BF_ROOT_A
# Build two bootfs copies with slot-specific cmdline.txt root=LABEL=...
echo "==> Building BF_BOOT_A + BF_BOOT_B bootfs copies"
# Build two bootfs copies with slot-specific cmdline.txt + autoboot.txt.
# Pi 5 bootloader reads autoboot.txt from the SAME partition as config.txt.
echo "==> Building BF_BOOT_A (partition 1 — primary boot)"
cp "$WORK/bootfs.vfat" "$WORK/bootfs_A.vfat"
BOOT_A_LOOP="$(losetup -f --show "$WORK/bootfs_A.vfat")"
mkdir -p "$WORK/mnt-ba"
mount "$BOOT_A_LOOP" "$WORK/mnt-ba"
sed -i 's|root=PARTUUID=[^ ]*|root=LABEL=BF_ROOT_A|' "$WORK/mnt-ba/cmdline.txt" 2>/dev/null || true
# autoboot.txt: normal boot → partition 1 (this one), tryboot → partition 2
cat > "$WORK/mnt-ba/autoboot.txt" <<'AUTOBOOT'
[all]
tryboot_a_b=1
boot_partition=1
[tryboot]
boot_partition=2
AUTOBOOT
umount "$WORK/mnt-ba"
losetup -d "$BOOT_A_LOOP"
fatlabel "$WORK/bootfs_A.vfat" BF_BOOT_A
echo "==> Building BF_BOOT_B (partition 2 — tryboot target)"
cp "$WORK/bootfs.vfat" "$WORK/bootfs_B.vfat"
BOOT_B_LOOP="$(losetup -f --show "$WORK/bootfs_B.vfat")"
mkdir -p "$WORK/mnt-bb"
mount "$BOOT_B_LOOP" "$WORK/mnt-bb"
sed -i 's|root=PARTUUID=[^ ]*|root=LABEL=BF_ROOT_B|' "$WORK/mnt-bb/cmdline.txt" 2>/dev/null || true
cat > "$WORK/mnt-bb/autoboot.txt" <<'AUTOBOOT'
[all]
tryboot_a_b=1
boot_partition=2
[tryboot]
boot_partition=1
AUTOBOOT
umount "$WORK/mnt-bb"
losetup -d "$BOOT_B_LOOP"
fatlabel "$WORK/bootfs_B.vfat" BF_BOOT_B
# Layout the new A/B image. GPT, 6 partitions.
SELECTOR_MB=8
# Layout the new A/B image. GPT, 5 partitions (no separate selector).
# Partition 1 = BF_BOOT_A (Pi bootloader looks here for config.txt).
BOOT_MB=$((BOOTFS_BYTES_SLOT / 1024 / 1024))
ROOT_MB=$((ROOTFS_BYTES_SLOT / 1024 / 1024))
DATA_MB=512
TOTAL_MB=$((SELECTOR_MB + BOOT_MB*2 + ROOT_MB*2 + DATA_MB + 32))
TOTAL_MB=$((BOOT_MB*2 + ROOT_MB*2 + DATA_MB + 32))
echo "==> Allocating ${TOTAL_MB} MiB output image"
truncate -s "${TOTAL_MB}M" "$WORK/out.img"
@ -118,8 +141,7 @@ truncate -s "${TOTAL_MB}M" "$WORK/out.img"
echo "==> Writing GPT partition table"
sfdisk "$WORK/out.img" <<SFDISK
label: gpt
start=2048, size=$((SELECTOR_MB * 2048)), type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="BF_BOOTSEL"
size=$((BOOT_MB * 2048)), type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="BF_BOOT_A"
start=2048, size=$((BOOT_MB * 2048)), type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="BF_BOOT_A"
size=$((BOOT_MB * 2048)), type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="BF_BOOT_B"
size=$((ROOT_MB * 2048)), type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, name="BF_ROOT_A"
size=$((ROOT_MB * 2048)), type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, name="BF_ROOT_B"
@ -135,49 +157,27 @@ get_part() {
}
# Write each partition content at its exact offset via dd.
echo "==> Writing BF_BOOTSEL"
echo "==> Writing BF_BOOT_A (partition 1)"
P_START=$(get_part 0 start)
mkfs.vfat -n "BF_BOOTSEL" -C "$WORK/selector.vfat" $((SELECTOR_MB * 1024))
# Mount the standalone FAT image to write autoboot.txt
SEL_LOOP="$(losetup -f --show "$WORK/selector.vfat")"
mkdir -p "$WORK/mnt-sel"
mount "$SEL_LOOP" "$WORK/mnt-sel"
cat > "$WORK/mnt-sel/autoboot.txt" <<'AUTOBOOT'
[all]
tryboot_a_b=1
PARTITION_WALK=1
boot_partition=2
[tryboot]
boot_partition=3
AUTOBOOT
umount "$WORK/mnt-sel"
losetup -d "$SEL_LOOP"
dd if="$WORK/selector.vfat" of="$WORK/out.img" bs=$SECTOR seek="$P_START" conv=notrunc status=none
echo "==> Writing BF_BOOT_A"
P_START=$(get_part 1 start)
dd if="$WORK/bootfs_A.vfat" of="$WORK/out.img" bs=$SECTOR seek="$P_START" conv=notrunc status=none
echo "==> Writing BF_BOOT_B"
P_START=$(get_part 2 start)
echo "==> Writing BF_BOOT_B (partition 2)"
P_START=$(get_part 1 start)
dd if="$WORK/bootfs_B.vfat" of="$WORK/out.img" bs=$SECTOR seek="$P_START" conv=notrunc status=none
echo "==> Writing BF_ROOT_A"
P_START=$(get_part 3 start)
echo "==> Writing BF_ROOT_A (partition 3)"
P_START=$(get_part 2 start)
dd if="$WORK/rootfs.ext4" of="$WORK/out.img" bs=$SECTOR seek="$P_START" conv=notrunc status=none
echo "==> Formatting BF_ROOT_B (empty placeholder)"
echo "==> Zeroing BF_ROOT_B (partition 4 — empty placeholder)"
P_START=$(get_part 3 start)
P_SIZE=$(get_part 3 size)
dd if=/dev/zero of="$WORK/out.img" bs=$SECTOR seek="$P_START" count="$P_SIZE" conv=notrunc status=none
echo "==> Zeroing BF_DATA (partition 5)"
P_START=$(get_part 4 start)
P_SIZE=$(get_part 4 size)
dd if=/dev/zero of="$WORK/out.img" bs=$SECTOR seek="$P_START" count="$P_SIZE" conv=notrunc status=none
# Can't mkfs.ext4 directly into a region of a file without losetup. Skip
# formatting B — rauc install will format it when writing the first update.
echo "==> Formatting BF_DATA"
P_START=$(get_part 5 start)
P_SIZE=$(get_part 5 size)
dd if=/dev/zero of="$WORK/out.img" bs=$SECTOR seek="$P_START" count="$P_SIZE" conv=notrunc status=none
echo "==> Final partition table"
sfdisk -d "$WORK/out.img"