All K8 builds now broken

Greg Watson gwatson at
Tue Mar 23 09:12:00 CET 2004

On 23/03/2004, at 12:50 AM, Eric W. Biederman wrote:

> Ok I suspect that code came early on and never got cleaned up.
> What this sounded like was a bug in existing code that caused things 
> to work
> incorrectly.  So at least on the Opteron things worked correctly.
> We need to go in and add better cpu selection support in the code.
> What I am thinking it to extract the vendor and model number for the
> cpu and with that select the code to run similarly to how we handle
> other devices.
> Given the number of small details that need to be verified when a new
> cpu comes out.  Microcode on the Xeons, memory controller enhancements
> on the Opterons, etc  I would rather have the build break on a new
> cpu than have everything just almost work silently.

This is probably a good idea, but note that the x86 and ppc 
architectures do things very differently. To start with ppc doesn't 
have the hierarchical arrangement that is used in x86. This leads to a 
much simpler setup, though it does duplicate some code, but in any 
event I don't want this to change. Also, the pre-C configuration is 
completely different (romcc is not used). However this is done, it will 
need to take these architectural differences into account.


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