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Implement A/B switch when moving back to Barebox (#1794)

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* Implement manual boot switch when downgrading to Barebox

When installing OS 7 or older from a OS 8 installation, the bootloader
is changed back to Barebox. However, in this case Barebox does not know
which boot slot is correct (and rauc won't update Barebox' state as it
is configured to work with GRUB in OS 8+).

This implements a poor mans version to switch the boot partition. It
clears Barebox state and deploys one of the two pre-configured default
states, booting either boot slot A or B.
This commit is contained in:
Stefan Agner 2022-03-23 16:00:49 +01:00 committed by GitHub
parent bd8c6cad40
commit aaa55848de
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 178 additions and 0 deletions
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2
buildroot-external/board/pc/generic-x86-64/hassos-hook.sh
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@ -9,6 +9,8 @@ function hassos_pre_image() {
cp "${BINARIES_DIR}/barebox.bin" "${BOOT_DATA}/EFI/BOOT/BOOTx64.EFI"
cp "${BR2_EXTERNAL_HASSOS_PATH}/bootloader/barebox-state-efi.dtb" "${BOOT_DATA}/EFI/barebox/state.dtb"
cp "${BR2_EXTERNAL_HASSOS_PATH}/bootloader/barebox-state-efi-A.dtb" "${BOOT_DATA}/EFI/barebox/state-A.dtb"
cp "${BR2_EXTERNAL_HASSOS_PATH}/bootloader/barebox-state-efi-B.dtb" "${BOOT_DATA}/EFI/barebox/state-B.dtb"
cp "${BOARD_DIR}/cmdline.txt" "${BOOT_DATA}/cmdline.txt"
}

2
buildroot-external/board/pc/ova/hassos-hook.sh
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@ -9,6 +9,8 @@ function hassos_pre_image() {
cp "${BINARIES_DIR}/barebox.bin" "${BOOT_DATA}/EFI/BOOT/BOOTx64.EFI"
cp "${BR2_EXTERNAL_HASSOS_PATH}/bootloader/barebox-state-efi.dtb" "${BOOT_DATA}/EFI/barebox/state.dtb"
cp "${BR2_EXTERNAL_HASSOS_PATH}/bootloader/barebox-state-efi-A.dtb" "${BOOT_DATA}/EFI/barebox/state-A.dtb"
cp "${BR2_EXTERNAL_HASSOS_PATH}/bootloader/barebox-state-efi-B.dtb" "${BOOT_DATA}/EFI/barebox/state-B.dtb"
cp "${BOARD_DIR}/cmdline.txt" "${BOOT_DATA}/cmdline.txt"
}

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buildroot-external/bootloader/barebox-state-efi-A.dtb Normal file
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76
buildroot-external/bootloader/barebox-state-efi-A.dts Normal file
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@ -0,0 +1,76 @@
/dts-v1/;
/ {
aliases {
state = &state;
};
state: state {
#address-cells = <1>;
#size-cells = <1>;
magic = <0xef98423f>;
compatible = "barebox,state";
backend = <&backend_state>;
backend-type = "raw";
backend-stridesize = <4048>;
bootstate {
#address-cells = <1>;
#size-cells = <1>;
A {
#address-cells = <1>;
#size-cells = <1>;
remaining_attempts@0 {
reg = <0x0 0x4>;
type = "uint32";
default = <3>;
};
priority@4 {
reg = <0x4 0x4>;
type = "uint32";
default = <20>;
};
};
B {
#address-cells = <1>;
#size-cells = <1>;
remaining_attempts@8 {
reg = <0x8 0x4>;
type = "uint32";
default = <0>;
};
priority@c {
reg = <0xc 0x4>;
type = "uint32";
default = <10>;
};
};
last_chosen@10 {
reg = <0x10 0x4>;
type = "uint32";
};
};
machine_id@14 {
reg = <0x14 0x24>;
type = "string";
default = "";
};
};
partitions {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fixed-partitions";
backend_state: state {
partuuid = "33236519-7f32-4dff-8002-3390b62c309d";
};
};
};

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buildroot-external/bootloader/barebox-state-efi-B.dtb Normal file
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76
buildroot-external/bootloader/barebox-state-efi-B.dts Normal file
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@ -0,0 +1,76 @@
/dts-v1/;
/ {
aliases {
state = &state;
};
state: state {
#address-cells = <1>;
#size-cells = <1>;
magic = <0xef98423f>;
compatible = "barebox,state";
backend = <&backend_state>;
backend-type = "raw";
backend-stridesize = <4048>;
bootstate {
#address-cells = <1>;
#size-cells = <1>;
A {
#address-cells = <1>;
#size-cells = <1>;
remaining_attempts@0 {
reg = <0x0 0x4>;
type = "uint32";
default = <3>;
};
priority@4 {
reg = <0x4 0x4>;
type = "uint32";
default = <10>;
};
};
B {
#address-cells = <1>;
#size-cells = <1>;
remaining_attempts@8 {
reg = <0x8 0x4>;
type = "uint32";
default = <3>;
};
priority@c {
reg = <0xc 0x4>;
type = "uint32";
default = <20>;
};
};
last_chosen@10 {
reg = <0x10 0x4>;
type = "uint32";
};
};
machine_id@14 {
reg = <0x14 0x24>;
type = "string";
default = "";
};
};
partitions {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fixed-partitions";
backend_state: state {
partuuid = "33236519-7f32-4dff-8002-3390b62c309d";
};
};
};

19
buildroot-external/ota/rauc-hook
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@ -28,6 +28,25 @@ case "$1" in
slot-install)
# Use install handlers below
;;
slot-post-install)
# Handle main slot only
test "${RAUC_SLOT_CLASS}" = "kernel" || exit 0
BOOT_MNT=/mnt/boot
if ! systemctl -q is-active mnt-boot.mount; then
systemctl start mnt-boot.mount
fi
# OS 8+ to 7 and lower downgrade path
if ! command -v barebox-state > /dev/null; then
cp -f "${BOOT_MNT}/EFI/barebox/state-${RAUC_SLOT_BOOTNAME}.dtb" "${BOOT_MNT}"/EFI/barebox/state.dtb
blkdiscard /dev/disk/by-partuuid/33236519-7f32-4dff-8002-3390b62c309d
echo "Cleared state and copied default state-${RAUC_SLOT_BOOTNAME}.dtb to state.dtb."
fi
exit 0
;;
*)
exit 1
;;

3
buildroot-external/scripts/ota.sh
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@ -38,6 +38,9 @@ function create_ota_update() {
echo "hooks=install"
echo "[image.kernel]"
echo "filename=kernel.img"
if [ "${BOOTLOADER}" == "barebox" ]; then
echo "hooks=post-install"
fi
echo "[image.rootfs]"
echo "filename=rootfs.img"
) > "${rauc_folder}/manifest.raucm"