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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	[thread overview]
Message-ID: <001801c02865$c71c1c10$b400a8c0@eventhorizon> (raw)
In-Reply-To: <39D18CAD.FDC505E0@mvista.com>


> 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


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

  parent reply	other threads:[~2000-09-27  9:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2000-09-26 22:34 switching linux kernels Julia Elbert
2000-09-27  0:40 ` Graham Stoney
2000-09-27  5:59   ` Dan Malek
2000-09-27  6:41     ` Graham Stoney
2000-09-27  9:31     ` Rob Taylor [this message]
2000-09-27 16:03       ` Dan Malek
2000-10-06 16:50         ` Rob Taylor
  -- strict thread matches above, loose matches on Subject: below --
2000-09-26 18:24 Julia Elbert
2000-09-26 16:59 Julia Elbert
2000-09-26  0:02 Julia Elbert
2000-09-26  0:25 ` Graham Stoney
2000-09-26 15:54 ` Dan Malek

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