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.
>
> 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.

> 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.