[U-Boot] [PATCH] arm: fix memory coherency problem after relocation

[Marek Vasut <marex@denx.de>]

Dear Mike Dunn,

> On 06/20/2013 06:56 AM, Marek Vasut wrote:
> > Dear Mike Dunn,
> > 
> >> On the xscale, the icache must be invalidated and the write buffers
> >> drained after writing code over the data bus, even if the caches are
> >> disabled. After rebasing with the main git repository, u-boot began
> >> crashing in odd places on my pxa270 board (palmtreo680) after the code
> >> relocation routine ran.  This patch fixes it.  Cache coherency problems
> >> are often
> >> hit-and-miss (ha ha), and this latent problem didn't rear its ugly head
> >> until now.  Tested on the pxa270.
> >> 
> >> Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
> >> ---
> >> 
> >> I realize that __ARM_ARCH_5TE__ does not necessarily mean xscale.
> > 
> > We should introduce some CONFIG_PXA I guess.
> 
> I think CONFIG_XSCALE is more correct, because if I'm not mistaken more
> recent Marvell processors continue to use the 'pxa' nomenclature in their
> name but do not contain xscale cores.

I suspect we might end up checking all the datasheets (PXA2xx, PXA3xx and 
PXA9xx) to see which CPUs still need this fixup.

Best regards,
Marek Vasut