Without Extraargs:
```
$ cat wic/generic-ufs-partitions.wks.in
part /boot --source bootimg-efi-isar --sourceparams "loader=systemd-boot" --label efi --part-type EF00 --align 1024 --use-uuid --size 512M
part --use-uuid --source rootfs --fstype=${BSP_ROOTFS_TYPE} --label system --active --align 1024 --exclude-path boot --fixed-size ${UFS_PART_SYSTEM_SIZE}
bootloader --ptable gpt --timeout 0 --append "${BSP_KERNEL_CMDLINE}

$ file development-image-industrial-os-qcs615-adp-air.wic.p1
development-image-industrial-os-qcs615-adp-air.wic.p1: DOS/MBR boot sector, code offset 0x58+2, OEM-ID "mkfs.fat", sectors/cluster 8, Media descriptor 0xf8, sectors/track 63, heads 32, sectors 1048572 (volumes > 32 MB), FAT (32 bit), sectors/FAT 1024, serial number 0xe9d3c0d4, label: "efi "
```

LOG:
```
DEBUG: ['mkdosfs', '-n', 'efi', '-i', '0x1C1D0579', '-S', '512', '-C', '/tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.vlfgf_0b/boot.img', '524288']
DEBUG: exec_native_cmd: export PATH=//sbin://usr/sbin://usr/bin://usr/bin/None://bin:None:$PATH;mkdosfs -n efi -i 0x1C1D0579 -S 512 -C /tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.vlfgf_0b/boot.img 524288
DEBUG: _exec_cmd: export PATH=//sbin://usr/sbin://usr/bin://usr/bin/None://bin:None:$PATH;mkdosfs -n efi -i 0x1C1D0579 -S 512 -C /tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.vlfgf_0b/boot.img 524288
DEBUG: ['export', 'PATH=//sbin://usr/sbin://usr/bin://usr/bin/None://bin:None:$PATH;mkdosfs', '-n', 'efi', '-i', '0x1C1D0579', '-S', '512', '-C', '/tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.vlfgf_0b/boot.img', '524288']
```

With Extraargs:

```
$ wic/generic-ufs-partitions.wks.in
part /boot --source bootimg-efi-isar --sourceparams "loader=systemd-boot,extraargs=-F 32 -S 4096 -r 2048" --label efi --part-type EF00 --align 1024 --use-uuid --size 512M
part --use-uuid --source rootfs --fstype=${BSP_ROOTFS_TYPE} --label system --active --align 1024 --exclude-path boot --fixed-size ${UFS_PART_SYSTEM_SIZE}
bootloader --ptable gpt --timeout 0 --append "${BSP_KERNEL_CMDLINE}"

$ file development-image-industrial-os-qcs615-adp-air.wic.p1
development-image-industrial-os-qcs615-adp-air.wic.p1: DOS/MBR boot sector, code offset 0x58+2, OEM-ID "mkfs.fat", Bytes/sector 4096, Media descriptor 0xf8, sectors/track 32, heads 8, sectors 131072 (volumes > 32 MB), FAT (32 bit), sectors/FAT 128, serial number 0xbf8798d0, label: "efi "
```

LOG:
```
DEBUG: Added 469589 extra blocks to /boot to get to 524288 total blocks
DEBUG: ['mkdosfs', '-n', 'efi', '-i', '0xBF8798D0', '-F', '32', '-S', '4096', '-r', '2048', '-C', '/tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.qd9it81v/boot.img', '524288']
DEBUG: exec_native_cmd: export PATH=//sbin://usr/sbin://usr/bin://usr/bin/None://bin:None:$PATH;mkdosfs -n efi -i 0xBF8798D0 -F 32 -S 4096 -r 2048 -C /tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.qd9it81v/boot.img 524288
DEBUG: _exec_cmd: export PATH=//sbin://usr/sbin://usr/bin://usr/bin/None://bin:None:$PATH;mkdosfs -n efi -i 0xBF8798D0 -F 32 -S 4096 -r 2048 -C /tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.qd9it81v/boot.img 524288
DEBUG: ['export', 'PATH=//sbin://usr/sbin://usr/bin://usr/bin/None://bin:None:$PATH;mkdosfs', '-n', 'efi', '-i', '0xBF8798D0', '-F', '32', '-S', '4096', '-r', '2048', '-C', '/tmp/development-image-industrial-os-qcs615-adp-air.wic/tmp.wic.qd9it81v/boot.img', '524288']
```

On Thursday, December 18, 2025 at 1:52:32 PM UTC+5:30 Richa Bharti wrote:

Some EFI firmwares require FAT filesystems to use specific geometry or
sector parameters.

Add support for an `extraargs` source parameter to allow passing
additional mkdosfs options when creating the EFI System Partition (ESP).
If no extra arguments are provided, mkdosfs defaults to "-S 512",
preserving existing behaviour.

Signed-off-by: Richa Bharti <Richa....@siemens.com>
---
meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py b/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
index 446398d0..6862a288 100644
--- a/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
+++ b/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
@@ -506,8 +506,10 @@ class BootimgEFIPlugin(SourcePlugin):

label = part.label if part.label else "ESP"

- dosfs_cmd = "mkdosfs -n %s -i %s -C %s %d" % \
- (label, part.fsuuid, bootimg, blocks)
+ extraargs = source_params.get('extraargs', "-S 512")
+
+ dosfs_cmd = "mkdosfs -n %s -i %s %s -C %s %d" % \
+ (label, part.fsuuid, extraargs, bootimg, blocks)
exec_native_cmd(dosfs_cmd, native_sysroot)

mcopy_cmd = "mcopy -i %s -s %s/* ::/" % (bootimg, hdddir)
--
2.39.5

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