[U-Boot] [PATCH] mpc83xx: Make it boot again

[Scott Wood]

[Responding here rather than directly to Dave since his e-mail showed
up blank here for some reason]

On Mon, 15 Nov 2010 18:30:46 +0100
Joakim Tjernlund <joakim.tjernlund at transmode.se> wrote:

> >
> > > The experts found an issue within init code and it looks like a proper
> > > patch will be added to mainline shortly.
> > > The discussion of the proper fix is right in this thread ...
> >
> > It should be timing issue in the SoC, software did not have a proper
> > process to handle
> > IMMR registers accessing.
> >
> > I agree Kumar on this.
> > Adding the read back with load is needing for the LAW window changing.
> > And something like sync/eieio instruction also need to be added between
> > stw and lwz...
> > to have a proper order accessing.

Wouldn't the fact that you're accessing the same address -- and
that it's cache inhibited -- eliminate the need for a sync instruction
between the stw and lwz?

-Scott