[Nouveau] [Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58806

--- Comment #2 from Marcin Slusarz <marcin.slusarz at gmail.com> ---
What we found so far:

Acceleration set up fails like that:
Stacktrace:
nouveau_drm_load
nouveau_accel_init
nouveau_channel_new
nouveau_channel_ind
nouveau_channel_prep
nouveau_bo_map
ttm_bo_kmap
ttm_bo_ioremap
ioremap_wc

ioremap_wc returns NULL. bo->mem.bus.base and bo->mem.bus.offset are 0.
Probably because of this code:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/char/agp/uninorth-agp.c;h=a32c492baf5cc15001ad6882dc25a14d1be86419;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e#l125
and ioremap fails because of this:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=arch/powerpc/mm/pgtable_32.c;h=6c856fb8c15b01705fb6cf5ff28c0a232d85d3bd;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e#l204

Booting with nouveau.agpmode=0 works.

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