Nouveau - Jul 2015 - Nouveau driver cannot extract DCB Block from OF DEV TREE

Hi,
As mentioned recently in the nouveau IRC room recently,

When running a Powermac 11.2, (G5 Quad) with a Quadro FX4500 (NV47), 
previous kernels had no issue extracting the DCB block / GPU BIOS from 
the OpenFirmware device tree via the FCODE ROM.
Last vanilla kernel that i have compiled seemed to work fine (vanilla 
3.18.16).

However, when compiling a newer vanilla kernel, (vanilla 4.1.2), nouveau 
seems to have an issue reading the DCB block / GPU BIOS from the 
OpenFirmware device tree.

As instructed, i have attached a dmesg.log along with a dump of the 
NVDA,BMP fimage out of the following folder: 
/sys/firmware/devicetree/base/pci at 0,f0000000/NVDA,Parent at 0/

Also, i have passed the following nouveau module options as instructed:
options nouveau config="NvMSI=0,debug=debug,VBIOS=trace"

Please let me know if there is any more info required.

Thanks for your help!

Best Regards,
Peter


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