From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rob Taylor" <robt@flyingpig.com>
To: <linuxppc-embedded@lists.linuxppc.org>
Subject: RE: switching linux kernels
Date: Wed, 27 Sep 2000 10:31:56 +0100
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> Please don't use in/out macros on PowerPC....especially on 8xx their
> underlying address arithmetic will likely break more things that it
> fixes.
> Use memory mapped I/O (readb/writeb, etc.) and ioremap().....

presumably this is due to int in/out macros adding _IO_BASE to the pointer? So
am I right in thinking that it makes sense to use in/out for ISA accesses (if
_IO_BASE is set correctly for your platform) and readb/writeb/.. for the rest of
your memory mapped registers?

Thanks,
Rob Taylor
Flying Pig Systems


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