ioremap on powerpc question
Steve.Cameron at hp.com
Tue Jul 16 23:25:20 EST 2002
> > 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.
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