ioremap on powerpc question

[Cameron, Steve]

[...]
> >
> > However, on powerpc, as soon as I try to do, for example:
> >
> > 	*buf = '\0'; // write one char to virt addr returned by ioremap
> >
> > It blows up with a machine check.
>
> You are hitting a 440GP specific feature.  ioremap is trapping
> ranges of addresses and "fixing them up" with the proper ERPN.
> Unfortunately, I left the default on a no match as an ERPN=1
> which will ioremap 1 0400 0000.   That's why you get a bus error.
>
> Try this patch:

Thanks!  That appears to work.
and thanks for explaining the rationale on the readb/writeb requirement.

-- steve

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