[Nouveau] DCB 4.1 spec update

[Ben Skeggs]

On Wed, Dec 10, 2014 at 7:36 AM, Ben Skeggs <skeggsb at gmail.com> wrote:
> On Wed, Dec 10, 2014 at 4:26 AM, Andy Ritger <aritger at nvidia.com> wrote:
>> Hi,
> Hey Andy,
>
>>
>> The VBIOS on GM20x GPUs uses a slightly updated version of the DCB.
>> I've posted an updated DCB spec here:
>>
>> ftp://download.nvidia.com/open-gpu-doc/DCB/2/DCB-4.x-Specification.html
>>
>> You can diff it against the previous version:
>>
>> ftp://download.nvidia.com/open-gpu-doc/DCB/1/DCB-4.0-Specification.html
>>
>> to see what changed (sorry for having to diff html files).  The biggest
>> differences are Serial Output Resource (SOR) assignment, and the updated
>> Communications Control Block layout.
> Thanks for the heads-up on the update.  The SOR assignment changes
> explain some things I noticed when bringing up the GM204 you guys sent
> me :)
One question I have on making proper use of this is how should the RM
determine which DCB entry (and hence, the correct pad macro) to use
based on the SorSetControl index from the supervisor?

Thanks,
Ben.

>
> Ben.
>
>>
>> I hope that is helpful,
>> - Andy
>>
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