[U-Boot] [PATCH 6/6] powerpc: Add LINK_OFF calls in early C-code.

[Joakim Tjernlund]

Scott Wood <scottwood at freescale.com> wrote on 2010/11/24 18:16:56:
>
> On Wed, 24 Nov 2010 12:04:15 +0100
> Joakim Tjernlund <joakim.tjernlund at transmode.se> wrote:
>
> > >
> > > Scott Wood <scottwood at freescale.com> wrote on 2010/11/23 23:32:04:
> > > >
> > > > On Tue, 23 Nov 2010 23:14:06 +0100
> > > > Joakim Tjernlund <joakim.tjernlund at transmode.se> wrote:
> > > >
> > > > > Scott Wood <scottwood at freescale.com> wrote on 2010/11/23 22:20:58:
> > > > > > "load address" being pre-relocation?  Currently these must be equal
> > > > > > (which doesn't seem particularly burdensome).
> > > > >
> > > > > Yes, but in our case we update the boot in the field and we want to
> > > > > make that safer by having two uboot areas but we don't want to carry around
> > > > > two u-boot images.
> > > >
> > > > How about playing with BATs before entering C code, so that the image
> > > > always appears at the same effective address?
> > >
> > > hmm, never thought of that. The extra bonus would be that LINK_OFF should
> > > not be needed either.
> >
> > After sleeping on it I realize that all direct accesses to the flash
> > such as getting the env. will need to be adjusted instead.
>
> You could have one small mapping for the U-Boot image, and another
> larger unchanging mapping that covers the whole flash.

Played a little with this but it seems like two BATs cannot overlap?