[PlanetCCRMA] alsa-kernel on a VIA C3 Centaur

[Fernando Pablo Lopez-Lezcano]

> I run the Planet on a homebrew machine with a VIA EPIA M9000 mini-ITX 
> motherboard, which has a C3 "Centaur" processor.  This is an i686 
> without the optional CMOV (conditional move) instruction.  When you 
> specify "C3" in a LInux kernel build, it compiles with march=i586, which 
> less than optimal but still OK.
> 
> I have been running with a 6-month-old planetdev kernel and alsa-driver:
> 
> http://www-ccrma.stanford.edu/planetccrma/mirror/redhat/linux/planetdev/8.0/en/os/i386/   
>   kernel-up-2.4.20-1.12.ll.acpi.i386.rpm
>   alsa-driver-2.4.20-1.12.ll.acpi-0.9.0-45.i386.rpm
> (there was no i586 specific build of this)
> 
> When I do a dist-upgrade, apt-get correctly installs the i586 versions of
> packages when their available.  The newer kernels boot up, but anything that 
> touches code in the alsa-kernel modules gets a segfault or SIGILL (illegal 
> instruction) indicating that there are CMOV instructions in the compiled code. 
> This can be confirmed with objdump -d.  For example on the new RH9 alsa-kernel
> (I upgraded hoping the problem would be fixed):
>   
>  [root at blumlein sound]# cd /lib/modules/2.4.22-6.ll.rh90/kernel/sound/
>  [root at blumlein sound]# objdump -d snd-ice1712.o |grep cmov
>      482:       0f 44 f8                cmove  %eax,%edi
>      a5d:       0f 45 44 24 04          cmovne 0x4(%esp,1),%eax
>      a6d:       0f 45 44 24 04          cmovne 0x4(%esp,1),%eax
>      a98:       0f 43 e8                cmovae %eax,%ebp
>      ba6:       0f 45 44 24 10          cmovne 0x10(%esp,1),%eax
>      bb6:       0f 45 44 24 10          cmovne 0x10(%esp,1),%eax
>      bdb:       0f 43 e8                cmovae %eax,%ebp
>      ebf:       0f 44 c2                cmove  %edx,%eax
>      f52:       0f 44 c2                cmove  %edx,%eax
>   (lots more ....)

Thanks for the detailed report. I'll check asap to see what can be done
so that alsa compiles for the right architecture. 

-- Fernando