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build: use 128MiB as the boot/kernel partition size on armvirt target

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The nominal partition type for EFI boot partitions is FAT32,
which has a minimum size of 32MiB on a 512-byte-sector block device.

To ensure that the boot partition is created as FAT32 set a size
well above this minimum.

A useful discussion about EFI partition sizes can be found here:
https://superuser.com/questions/1310927/what-is-the-absolute-minimum-size-a-uefi-system-partition-can-be

I have found 128MiB works pretty consistently across both
tools (mkfs.fat) and firmwares (EDKII)

Signed-off-by: Mathew McBride <matt@traverse.com.au>
This commit is contained in:
Mathew McBride
2021-06-01 01:48:25 +00:00
committed by Petr Štetiar
parent 3d99314569
commit 71e56b2ff1
1 changed files with 1 additions and 0 deletions
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config/Config-images.in
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@@ -292,6 +292,7 @@ menu "Target Images"
depends on USES_BOOT_PART depends on USES_BOOT_PART
default 8 if TARGET_apm821xx_sata default 8 if TARGET_apm821xx_sata
default 64 if TARGET_bcm27xx default 64 if TARGET_bcm27xx
default 128 if TARGET_armvirt
default 16 default 16
config TARGET_ROOTFS_PARTSIZE config TARGET_ROOTFS_PARTSIZE