[Bug 91319] New: Nouveau driver cannot extract FCODE ROM / DCB Block from OpenFirmware Device tree - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 91319] New: Nouveau driver cannot extract FCODE ROM / DCB Block from OpenFirmware Device tree
Date: Mon, 13 Jul 2015 00:34:05 +0000	[thread overview]
Message-ID: <bug-91319-8800@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=91319

            Bug ID: 91319
           Summary: Nouveau driver cannot extract FCODE ROM / DCB Block
                    from OpenFirmware Device tree
           Product: xorg
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: psaisanas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 117079
  --> https://bugs.freedesktop.org/attachment.cgi?id=117079&action=edit
kernel dmesg log & NVDA,BMP FCODE ROM

Hi,

When running a Powermac 11.2, (G5 Quad - powerpc64) with a Quadro FX4500
(NV47), previous kernels had no issue extracting the FCODE ROM / DCB block via
the OpenFirmware device tree.
Last vanilla kernel that i have compiled that seemed to work fine was kernel
3.18.16.
Normally, it will find the "BIT SIGNATURE" via OpenFirmware method.

However, when compiling a newer vanilla kernel 4.1.2, nouveau seems to have an
issue reading the FCODE ROM / DCB block / from the OpenFirmware device tree.
Also, interestingly, this time around it attempts to use the PROM method and
attempts to find the "BIT SIGNATURE" via this method.
Apparently it found a signature, but looks like garbage and seems like it cant
extract the DCB BLOCK.

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

Not sure if this is correct, but i have passed the following nouveau module
options as i understood:

options nouveau config="NvMSI=0,debug=debug,VBIOS=trace"

I have placed the kernel dmesg log along with the NVDA,BMP dump in the attached
nouveau_powerpc64_pmac11.2.tar.xz archive.

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

Thanks for your help!

Best Regards,
Peter

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