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Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: fix PCI configuration space Mem

From: Alexander Graf
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: fix PCI configuration space MemoryRegions for grackle/uninorth
Date: Wed, 18 Dec 2013 22:24:44 +0100

On 18.12.2013, at 22:04, Benjamin Herrenschmidt <address@hidden> wrote:

> 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 :-)

Then I don't understand why we break when we limit the data region to 4 bytes.


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