[PlanetCCRMA] alsa kernel modules: invalid module format

Fernando Pablo Lopez-Lezcano nando@ccrma.Stanford.EDU
Mon Nov 8 14:39:03 2004

On Mon, 2004-11-08 at 14:27, Aaron Heller wrote:
> --On Monday, November 8, 2004 14:11 -0800 Samuel Sieb <samuel@sieb.net>
> wrote:
> > Aaron Heller wrote:
> >> A year or so ago, when I was trying to use alsa kernel modules compiled
> >> for i686 on my M9000 (this is a low-power processor that is missing some
> >> optional i686 instructions), I did not get invalid module format error
> >> messages like the above.  The modules loaded just fine, but then raised
> >> SIGILL (illegal instruction) errors the first time the code was invoked,
> >> e.g., when alsactl loads the saved mixer settings.
> >
> > But you were probably running the i686 kernel, right?  I'm running an
> > i586 kernel, but the i586 alsa modules are actually labelled as i686, so
> > the kernel says they don't match.
> No, that machine runs a i586 kernel.  There was an error in the build
> script for ALSA that was causing the modules to be compiled by gcc with
> -march 686, but then packaged as i586 rpms.  Apt-get correctly ID'd the
> processor as needing i586 rpms and downloaded and installed them.  But the
> build error caused the i586 kernel modules to be polluted with i686
> instructions (CMOVs to be precise).

I have not actually confirmed this is the case, but I strongly suspect
that's the problem (I was about to answer but I don't I could have been
as clear as you were, thanks). 

-- Fernando