[Openchrome-users] CN700 XvMC

[Thomas Hellström]

Bart Hartgers wrote:

>Bart Hartgers wrote:
>  
>
>>>Message: 1 Date: Wed, 14 Jun 2006 11:21:46 -0700 From: Trevor
>>>Kramer <tkramer at hampshire.edu> Subject: [Openchrome-users] CN700
>>>XvMC To: openchrome-users at openchrome.org Message-ID:
>>><ADAA9D0D-91D5-4E12-8EF6-986686DDD7D0 at hampshire.edu> Content-Type:
>>>text/plain; charset=US-ASCII; delsp=yes; format=flowed
>>>
>>>Hello,
>>>
>>>I have successfully gotten X running on a EPIA EN12000E (CN700, 
>>>vt1625) using a patch supplied on the mailing list for tv-out. I
>>>also built the latest drm code adding the new pci ids the to 
>>>drm_pciids.txt file. Xv works and dri is initialized but when using
>>> XvMC in mythtv I just a black screen.  This is outputted on the 
>>>system log.
>>>
>>>agpgart: Found an AGP 3.5 compliant device at 0000:00:00.0. 
>>>agpgart: Xorg tried to set rate=x12. Setting to AGP3 x8 mode. 
>>>agpgart: Putting AGP V3 device at 0000:00:00.0 into 8x mode 
>>>agpgart: Putting AGP V3 device at 0000:01:00.0 into 8x mode 
>>>[drm:via_mem_alloc] *ERROR* Attempt to allocate from uninitialized
>>> memory manager.
>>>      
>>>
>
>Some digging around in the openchrome sources showed that this is caused
>by via_dri.c:VIADRIFBInit, where VIAAllocLinear is called before
>drmCommandWrite(pVia->drmFD, DRM_VIA_FB_INIT,.. .
>
>So the fix seems to be in changing the order. However, DRM_VIA_FB_INIT
>needs an fb.offset that is returned by VIAAllocLinear. I am not quite
>sure how to fix that chicken-and-egg problem.
>
>Any ideas?
>
>Groeten,
>Bart
>
>  
>
A pretty severe bug. The VIAAllocLinear in VIADRIFBInit is supposed
to allocate from the X memory manager, but it allocates from the drm
memory manager which is not yet initialized.

Fixed in revision 189.

/Thomas

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