Re: [PATCH 08/19] parisc: define DPS root partition type UUID

On Mon, 2026-06-15 at 18:09 +0200, Vincent Mailhol wrote:
> DPS [1] assigns GPT partition type UUIDs to operating system
> partitions. Root partitions use architecture-specific type UUIDs so
> the OS can discover the intended root filesystem without relying on a
> root=  cmdline option.
> 
> Define DPS_ROOT_PARTITION_TYPE_UUID in asm/dps_root.h for parisc and
> select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID.
> 
> [1] The Discoverable Partitions Specification (DPS)
> Link:
> https://uapi-group.org/specifications/specs/discoverable_partitions_specification/

How are you planning to make this work for parisc?  Some systems have a
PALO boot partition (fdisk type 0xf0) but the more modern way is to
place palo inside a hidden ext4 inode in /boot.  The way parisc IODC
works is very similar to the way MSDOS boots with the palo location
table in the first block so I theorize that would probably work for gpt
partitions as well ... I'm just not sure anyone has tested it.

However, to get this to work with PALO for auto discovery, you'd need
palo patches to recognize the DPS UUID and no-one seems to have
submitted anything to palo for this.

Regards,

James