On 19-Mar-07, at 2:13 PM, Ignatios Souvatzis wrote:

> However, they do support some CPUs (S390) that were sponsored by the
> vendor as a technology demonstration, and that we don't.

I personally have worked with 2 processors for which support exists  
in the main tree but you'd be crazy to use the code found there.  The  
vendor versions are actually sufficiently different from what's in  
the public tree...