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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [vdpau,uvd] kernel oops, Unable to handle kernel paging request at virtual address"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83708#c17">Comment # 17</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [vdpau,uvd] kernel oops, Unable to handle kernel paging request at virtual address"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83708">bug 83708</a>
from <span class="vcard"><a class="email" href="mailto:deathsimple@vodafone.de" title="Christian König <deathsimple@vodafone.de>"> <span class="fn">Christian König</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=83708#c16">comment #16</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=83708#c15">comment #15</a>)
> > 1. I do not add cpu_to_le32() first ,but when I trace the messages from
> > printk,the value of msg_type is reversed.
>
> That's in radeon_uvd_cs_msg()? Sounds like the Mesa UVD code writes the
> messages in host byte order, not in little endian. Maybe Christian can
> clarify which byte order should be used for them.</span >
The hardware supports byte swapping for the message and feedback buffer, but I
think always writing/reading it in little endian will be simpler to get
working.
The userspace code currently doesn't supports big endian hosts and so will
probably write it in the wrong byte order.</pre>
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