From: acrux <acrux_it@libero.it>
To: Josh Boyer <jwboyer@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: sam460ex, sm501 incorrect device id with kernel >=linux-2.6.39
Date: Mon, 28 Nov 2011 20:56:55 +0100 [thread overview]
Message-ID: <20111128205655.fc4d3249.acrux_it@libero.it> (raw)
In-Reply-To: <CA+5PVA592G1RVdj_C+NMFQ8nHx=0-eaF9Hn3NZ8VabpCTQGi1Q@mail.gmail.com>
On Mon, 28 Nov 2011 07:12:38 -0500
Josh Boyer <jwboyer@gmail.com> wrote:
> On Sun, Nov 27, 2011 at 11:37 AM, acrux <acrux_it@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@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@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@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/
next prev parent reply other threads:[~2011-11-28 19:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-27 16:37 sam460ex, sm501 incorrect device id with kernel >=linux-2.6.39 acrux
2011-11-28 12:12 ` Josh Boyer
2011-11-28 19:56 ` acrux [this message]
2011-11-28 20:22 ` Anatolij Gustschin
2011-12-02 14:48 ` acrux
2011-12-02 15:35 ` Anatolij Gustschin
-- strict thread matches above, loose matches on Subject: below --
2011-11-29 1:00 acrux_it
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