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wic: Add gpt-hybrid partition layout

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Add support for formatting a disk with a hybrid MBR & GPT partition
scheme. In this scheme, the primary partitioning method is GPT, but a
valid MBR header is also written than can point to a subset of the GPT
partitions on the disk (any partitions marked with the `--mbr` flag will
be included in this MBR). The primary purpose of this method is to allow
for SoCs that can only find a bootloader in an MBR partition to use GPT
once the bootloader is running. As an example, older versions of the
Raspberry Pi firmware can only parse MBR partitions to find a kernel (or
other bootloader like u-boot), but once those have booted GPT partitions
can be used.

In addition to the partitions annotated with the `--mbr`, a "protective"
GPT partition of type 0xEE is added, as the existence of such a
partition is the indication to tooling that this a hybrid MBR and that
the GPT partition table should be parsed instead.

(From OE-Core rev: e50e4c2a5ada6947b3503ca4d8e9c30d359e8a5d)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Joshua Watt
2023-08-30 08:20:17 -06:00
committed by Richard Purdie
parent 9d9c7d4b0b
commit 93388921ab
3 changed files with 71 additions and 19 deletions
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scripts/lib/wic/ksparser.py
+2 -1
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@@ -188,11 +188,12 @@ class KickStart():
part.add_argument('--uuid')
part.add_argument('--fsuuid')
part.add_argument('--no-fstab-update', action='store_true')
part.add_argument('--mbr', action='store_true')
bootloader = subparsers.add_parser('bootloader')
bootloader.add_argument('--append')
bootloader.add_argument('--configfile')
bootloader.add_argument('--ptable', choices=('msdos', 'gpt'),
bootloader.add_argument('--ptable', choices=('msdos', 'gpt', 'gpt-hybrid'),
default='msdos')
bootloader.add_argument('--timeout', type=int)
bootloader.add_argument('--source')