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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Subject: Re: [Qemu-devel] [PATCH] PPC: fix PCI configuration space
 MemoryRegions for grackle/uninorth
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To: Alexander Graf <agraf@suse.de>
Cc: qemu-ppc <qemu-ppc@nongnu.org>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, QEMU Developers <qemu-devel@nongnu.org>, Andreas =?ISO-8859-1?Q?F=E4rber?= <afaerber@suse.de>, =?ISO-8859-1?Q?Herv=E9?= Poussineau <hpoussin@reactos.org>

On Wed, 2013-12-18 at 13:34 +0100, Alexander Graf wrote:
> Hrm. Are you 100% sure this correct? This UniNorth is a real headache.
> The closest thing to a spec for it is the U4 spec which is generations
> ahead:
> 
>   http://www.datasheetarchive.com/dl/Datasheets-SW3/DSASW0048084.pdf
> 
> On that at page 109 you can see that you do indeed have a range of
> registers and a few fancy modes that can even be used to directly
> access config space registers without the usual index/data cycle.
> 
> Ben, do you have any more insight into how the original Uninorth
> worked?

Just index/data. Look at Linux :-)

Cheers,
Ben.