Add support for A/B partition layout in rpi-sdimg class #1428
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Description: This patch introduces support for an A/B partition layout in the rpi-sdimg image creation process, enabling dual root filesystem partitions. This enhancement allows for more robust and flexible system updates by providing a fallback partition. Key Changes: New Variables Introduced: ROOTFS_PARTITION_SIZE: Specifies the size of each root filesystem partition. The default value is set to 4 GB. RPI_AB_PARTITION_LAYOUT: Determines the partition layout. The default value is 0, which indicates a single root filesystem partition. Setting this variable to 1 enables the A/B partition layout. Disk Layout: Single Partition Layout: 0 -> IMAGE_ROOTFS_ALIGNMENT - reserved for other data IMAGE_ROOTFS_ALIGNMENT -> BOOT_SPACE - bootloader and kernel BOOT_SPACE -> SDIMG_SIZE - rootfs A/B Partition Layout: 0 -> IMAGE_ROOTFS_ALIGNMENT - reserved for other data IMAGE_ROOTFS_ALIGNMENT -> BOOT_SPACE - bootloader and kernel BOOT_SPACE -> ROOTFS_A - rootfs for partition A ROOTFS_A -> ROOTFS_B - rootfs for partition B Signed-off-by: abdelkhalek-mansouri <[email protected]>
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Description:
This patch introduces support for an A/B partition layout in the rpi-sdimg image creation process, enabling dual root filesystem partitions. This enhancement allows for more robust and flexible system updates by providing a fallback partition.
Key Changes:
New Variables Introduced:
ROOTFS_PARTITION_SIZE: Specifies the size of each root filesystem partition. The default value is set to 4 GB. RPI_AB_PARTITION_LAYOUT: Determines the partition layout. The default value is 0, which indicates a single root filesystem partition. Setting this variable to 1 enables the A/B partition layout.
Disk Layout:
Single Partition Layout:
0 -> IMAGE_ROOTFS_ALIGNMENT - reserved for other data
IMAGE_ROOTFS_ALIGNMENT -> BOOT_SPACE - bootloader and kernel
BOOT_SPACE -> SDIMG_SIZE - rootfs
A/B Partition Layout:
0 -> IMAGE_ROOTFS_ALIGNMENT - reserved for other data
IMAGE_ROOTFS_ALIGNMENT -> BOOT_SPACE - bootloader and kernel
BOOT_SPACE -> ROOTFS_A - rootfs for partition A
ROOTFS_A -> ROOTFS_B - rootfs for partition B
Signed-off-by: abdelkhalek-mansouri [email protected]