Plugin efibootguard-boot doesn't support to specify root parameter with unified kernel image

Hi all,

I have a target image with following partitions:

|- bootloader (efibootguard)
|- system A (linux.efi)
|- system B (linux.efi)
|- root FS A
|- root FS B

My plan is to use plugin efibootguard-boot to generate linux.efi respectively for system A/B and they can mount related root FS. So, I need to specify root parameter respectively in linux.efi. After checking the code, I found that there is only 1 place to specify it, bootloader command with option --append in wks file. This method can only specify 1 root parameter.

I have tried to modify this plugin as following:
[cid:[email protected]]
Within this modification, linux.efi could contain its own root parameter.

I don't know if it is a right way, please let me know if you have some suggestions. Thanks in advance.

With best regards,
Cheng Shu Mou

Siemens Ltd., China
RC-CN DI FA BL IE
Tianyuan road No.99
611731 CHENGDU, China
mailto:[email protected]
www.siemens.com<https://siemens.com>
[cid:[email protected]]

Hi Cheng Shu Mou,

Could please you sent your modification the next time as patch or text snippet?

With a fixed root parameter you need to ensure
that the partition you update is on all devices the same, e.g.
A -> B -> A
1.0 -> 1.1 -> 1.2

For example this does not work:
A -> A
1.0 -> 1.2

The customer needs to update first to 1.1 and B before updating to 1.2.

In cip we have solved this issue of root fs selection by adding a uuid or use verity checksum to identify the root file system corresponding to the linux.efi. This allows us to update independent from the root parameter.

Kind regards,

Quirin