Re: 2.4.26-xen0 unresolved symbol _mmx_memcpy in USB modules

[Zachary Amsden <zach@vmware.com>]

In general, modules for different processors or subarchitectures are not 
cross compatible.  Modules compiled for Athlon will use MMX instructions 
to do fast memcopy, but a kernel compiled for Pentium II does not export 
the _mmx_memcpy symbol for modules to use - not because it's not 
supported, but because it's just not as fast on Pentium II.  You should 
be able to use modules which are a strict ancestor of the current kernel 
architecture without problems - i.e. a 386 module in a Pentium II kernel 
should not cause grief.  YMMV.  I highly recommend using modules 
compiled for the same kernel configuration, however.

Cheers,
Zach

Mark Hurenkamp wrote:

>Hi,
>
>I've been playing with the 2.4.26 and 2.4.27 xen0 kernels, and at some
>point I noticed that I was unable to load the USB modules anymore because
>of an unresolved _mmx_memcpy symbol...A bit of fiddling with my settings showed that when I build all my USB
>modules in the kernel, the problem goes away, or alternately, if I switch
>back from Athlon to Pentium II cpu (which was my original setting).
>So for now I'm using the Pentium II as my CPU selection, but I was just
>wondering if this is a known problem, or if I stumbled across something
>new :-) ?
>Warm regards,
>Mark.
>
>
>
>
>
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