On Mon, Oct 13, 2025, at 10:20 AM, Lennart Poettering wrote:
> On Do, 09.10.25 14:51, Chris Murphy ([email protected]) wrote:
>> Boot Loader Spec [1] says, verbatim
>>
>> "ESP must — and the MBR boot and GPT XBOOTLDR partition should — be a file 
>> system readable by the firmware"
>>
>> XBOOTLDR is permitted by the spec to be any file system.
>>
>> ESP and BOOTLDR are not required to be writeable by the firmware.
>
> Well, sure, we allowed some flexibility there, but made the intention
> clear, no? 

Super clear. Non-FAT XBOOTLDR is permitted. Non-FAT EFI file system drivers to 
provide firmware-level support for a file system, is permitted.

If Boot Loader Spec aims to constrain the UEFI spec, then it needs to use 
language that does that.

>Of course, I regret having granted the flexibility, that
> was a mistake.

What about fixing the spec to reflect this?

Because then the present behavior is a legitimately a bug and can be reverted 
to use the generic Linux partition type GUID, or something else. And stop 
proliferating non-FAT XBOOTLDR.


-- 
Chris Murphy
-- 
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