Re: debian-installer: please default to grub-ieee1275 on powerpc instead of yaboot
On Thu, Sep 21, 2017 at 10:37:43PM +0200, John Paul Adrian Glaubitz wrote:
> I have one POWER7 machine that has been provided to me by IBM for testing
> purposes and to host one of our buildds. I have performed a test installation
> of openSUSE Tumbleweed on it.
>
> Here's the partitioning scheme that is being used:
>
> (parted) p
> Model: Virtio Block Device (virtblk)
> Disk /dev/vda: 42.9GB
> Sector size (logical/physical): 512B/512B
> Partition Table: msdos
> Disk Flags:
>
> Number Start End Size Type File system Flags
> 1 1049kB 2097kB 1049kB primary boot, prep, type=41
> 2 2097kB 2163MB 2161MB primary linux-swap(v1) type=82
> 3 2163MB 18.9GB 16.7GB primary btrfs type=83
> 4 18.9GB 42.9GB 24.0GB primary xfs type=83
>
> (parted)
>
> Interestingly, /boot is part of the btrfs filesystem:
>
> linux-mfl2:~ # mount | grep boot
> /dev/vda3 on /boot/grub2/powerpc-ieee1275 type btrfs (rw,relatime,space_cache,subvolid=261,subvol=/@/boot/grub2/powerpc-ieee1275)
> linux-mfl2:~ #
Well as long as grub can read that, then no problem. So as long as
grub-install is including btrfs support in the grub image placed in the
prep boot partition, then /boot can be on btrfs. That is almost certainly
the case.
> Ok, so I guess we can basically rule out GPT for the default label even
> on POWER systems. I would therefore then vote for using MS-DOS partition
> tables on POWER systems, i.e. what is already used now.
For powerpc/ppc64 I would agree. For ppc64el GPT should be fine, and
I believe someone said that is in fact what they have done since it is
power8+ only.
> So, MS-DOS partition tables will not work at all on a Mac, correct?
Not as far as I know. And given the apple partition table is better
anyhow, why would you want to?
--
Len Sorensen
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