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

[Joakim Tjernlund]

Andre Schwarz <andre.schwarz at matrix-vision.de> wrote on 2010/11/15 10:57:30:
>
> On 11/12/2010 08:31 PM, Scott Wood wrote:
> > On Fri, 12 Nov 2010 13:26:17 -0600
> > Kumar Gala<galak at kernel.crashing.org>  wrote:
> >
> >
> >> On Nov 12, 2010, at 11:22 AM, Scott Wood wrote:
> >>
> >>
> >>> On Fri, 12 Nov 2010 09:58:53 -0600
> >>> Kumar Gala<galak at kernel.crashing.org>  wrote:
> >>>
> >>>> We only do the 'twi' for loads/in_beX not stores/out_beX.
> >>>>
> >>> Yes, and the readback is a load.
> >>>
> >> following the store with a load should be sufficient I dont think we need the twi in this case.
> >>
> > Do we ever need it, or is guarded+cache inhibited sufficient to
> > completely hold up execution of anything beyond the load?
> >
>
> Sorry for being insistent :
> Is there any explanation why this issue only came up on Jocke's MPC8321
> (?) and my MPC8377 ?

Has anyone else tested 83xx on NOR?
My guess is that cache line crossing shifted so that now the CPU
doesn't need to read in a new cache at the critical part.

>
> As mentioned here
> (http://lists.denx.de/pipermail/u-boot/2010-November/081459.html)
> there's still a mysterious issue which might have the same root cause.
> Again : USB is working fine under Linux - it's an U-Boot only issue.
>
> Is anybody willing to have a closer look - I'm completely stuck here.

Nope, don't use USB.