[Nouveau] [Bug 96836] Kernel unaligned access at TPC[105d9fb4] nvkm_instobj_wr32+0x14/0x20 [nouveau]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96836

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Hmmm... maybe with nv3x the 4K pages aren't such a hard requirement. Definitely
people on PPC64 with 64K pages had trouble with nv4x though.

But, if it worked before, it can work again. Since this isn't exactly *the*
most common setup, you're going to have to do a bit more of the work. Try more
kernels. Nouveau got a huge rewrite in kernel 4.3, try 4.2 maybe? That rewrite
ended up breaking BE briefly, but I fixed it up again and it was working
semi-recently on my FX5200 in a G5 (PPC64, also BE).

iowrite32_native is used all over the place to write to the card's MMIO space
in one of the BARs (can never remember which).

The specific error seems to indicate that we did a wr32 on an instobj to a
non-32-bit-aligned address. This would be very surprising. Please boot with

nouveau.debug=trace

and attach a full log of the result. (It should be large.)

Also, please try several kernels, including both pre- and post-4.3 ones.

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