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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? 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.

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