AMD E8860 on PowerPC with u-boot (T2080)

[Christian König]

Am 21.02.2018 um 10:06 schrieb Michel Dänzer:
> On 2018-02-21 09:49 AM, Bas Vermeulen wrote:
>> Hi,
>>
>> I am unsure if this is the right place to ask, but it seems relevant.

Well this list is certainly the right place to ask :)

>> I am trying to use an AMD E8860 (SI) board connected to an E6500 PowerPC
>> board (T2080RDB from NXP).
>> The T2080RDB does not use a BIOS, and uses u-boot to bootstrap Linux.
>>
>> I have the E8860 connected to a PCIe x4 slot with an adapter. The kernel
>> is a 4.1, with DRM included in the kernel and the radeon as a module.
>> The radeon driver detects the card, notices the BIOS hasn't posted and
>> starts things up.
>> After that, the ring tests get run, and fails on the ring 0 test,
>> disabling acceleration. The graphics card is (or seems to be) working
>> apart from that, the driver starts up and sees the connectors on the board.
>>
>> When I compare dmesg on an x86 machine and the PPC machine, I see that
>> the x86 machine loads a lot more firmware from the kernel (probably the
>> acceleration parts?).
> FWIW, that's probably just a subsequent symptom due to the ring test
> failure.

Could be, but IIRC we load all the firmware first then initialize things 
and then do the ring tests when we try to start the rings.

BTW: What driver are you using? radeon or amdgpu?

>> My question is, what do I need to do to correctly initialize the E8860
>> board on my powerpc machine?
> Start by sharing the dmesg output, and maybe also the kernel build
> configuration file.

Maybe also open a bug report to attach the dmesg, see bugs.freedesktop.org.

Regards,
Christian.