sam460ex, sm501 incorrect device id with kernel >=linux-2.6.39

[acrux]

On Mon, 28 Nov 2011 07:12:38 -0500
Josh Boyer <jwboyer at gmail.com> wrote:

> On Sun, Nov 27, 2011 at 11:37 AM, acrux <acrux_it at libero.it> wrote:
> >
> > Acube Sam460ex has SM502 as onboard video.
> > I got this with any kernel newer than 2.6.38.x thus the framebuffer
> > is lost too:
> >
> > root at sam4x0:~# diff dmesg-2.6.38.8 dmesg-2.6.39.4
> > 1,2c1,3
> > < Using PowerPC 44x Platform machine description
> > < Linux version 2.6.38.8-Sam460ex (root at sam4x0) (gcc version 4.5.3
> > (CRUX PPC) ) #1 Fri Nov 11 22:07:53 CET 2011
> > ---
> >> Using Canyonlands machine description
> >> Initializing cgroup subsys cpu
> 
> You seem to have switched from using the generic PowerPC 44x platform,
> to using a Canyonlands kernel and/or DTB.  Not sure why that is, but
> it's probably not helping your issues at all.
> 

i think it was only a cosmetic change as it was always used
Canyonlands platform and his own proper dtb.


> >> Linux version 2.6.39.4-Sam460ex (root at sam4x0) (gcc version 4.5.3
> >> (CRUX PPC) ) #1 Fri Nov 11 19:06:02 CET 2011
> > 17c18
> > [cut]
> > 161,179c165,167
> > < sm501 0001:00:06.0: SM501 At f5480000: Version 050100c0, 64 Mb,
> > IRQ 19
> 
> > ---
> >> sm501 0001:00:06.0: incorrect device id c0000105
> 
> Something is reading the device ID in the wrong endian (and probably
> everything else).
> 

it seems to be an endianess issue but i didn't find when it was
introduced.  Really strange this kind of issue was never noticed
bumping from 2.6.38.x to 2.6.39.x .

--nico
-- 
GNU/Linux on Power Architecture
CRUX PPC - http://cruxppc.org/