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Re: workaround install boot on btrfs with windows partition scheme
From: |
Andrei Borzenkov |
Subject: |
Re: workaround install boot on btrfs with windows partition scheme |
Date: |
Mon, 3 Nov 2014 08:31:58 +0300 |
В Sun, 2 Nov 2014 15:11:29 -0700
Chris Murphy <address@hidden> пишет:
>
> On Nov 1, 2014, at 11:27 PM, Andrei Borzenkov <address@hidden> wrote:
>
> > В Sat, 1 Nov 2014 14:35:57 -0600
> > Chris Murphy <address@hidden> пишет:
> >>
> >> Why not have a dedicated partition with MBR type code for core.img,
> >> equivalent to BIOSBoot currently used on GPT? freedesktop.org has a
> >> proposal to use type code 0xEA for this purpose (in part). The boot.img
> >> code in the MBR can arbitrarily jump to any LBA, so 0xEA doesn't need to
> >> be a primary partition does it?
> >>
> >
> > It is rarely needed in simple cases; in complicated cases (btrfs or
> > LVM) we already have space dedicated for core.img. It seems more
> > logical to use this space.
>
> Well actually it isn't rare in simple cases. The most common case on Linux is
> booting from ext which grub won't embed to either without --force.xz_dec_lzma2
We are discussing installation in MBR here, not in partition.
> So we have to have core.img embedded somewhere else. UEFI it's a fixed
location. BIOS+GPT it's a fixed location. Only on MBR is it in an
unreserved location or forcibly embedded - that's really where the
problem is. It seems a lot simpler to constrain the MBR options down
to only a reserved partition just like elsewhere where it's now much
simpler because it can only properly go in one location.
>
>
> > Also you still need to tell grub-setup to use this special partition at
> > which point why not extend it to support arbitrary location for
> > core.img? It could be made check partition type and not refuse to
> > install on raw partition for special 0xEA type then as a bonus.
>
> I never tell grub-setup to use BIOSboot partition type. It always just finds
> it automatically.
>
I do not really trust anyone respect partition types on MBR to be
honest. So I would rather avoid blindly overwriting anything without
explicit user's consent.
- Re: workaround install boot on btrfs with windows partition scheme, Chris Murphy, 2014/11/01
- Re: workaround install boot on btrfs with windows partition scheme, Andrei Borzenkov, 2014/11/02
- Re: workaround install boot on btrfs with windows partition scheme, Chris Murphy, 2014/11/02
- Re: workaround install boot on btrfs with windows partition scheme, Andrei Borzenkov, 2014/11/03
- Re: workaround install boot on btrfs with windows partition scheme, Chris Murphy, 2014/11/03
- Re: workaround install boot on btrfs with windows partition scheme, Andrei Borzenkov, 2014/11/03
- Re: workaround install boot on btrfs with windows partition scheme, Chris Murphy, 2014/11/03
- Re: workaround install boot on btrfs with windows partition scheme, Andrei Borzenkov, 2014/11/04
- Re: workaround install boot on btrfs with windows partition scheme, Chris Murphy, 2014/11/04