[OLPC-devel] Re: OLPC/LinuxBIOS: PCI configuration or not?

[Ronald G Minnich]

Marcelo Tosatti wrote:
> On Sun, May 21, 2006 at 10:18:39AM -0600, Ronald G Minnich wrote:
> 
>>David Woodhouse wrote:
>>
>>
>>>>Dropping PCI support from the kernel is certainly good from a memory
>>>>footprint point of view, we might want to do that later during the game.
>>>
>>>
>>>Absolutely.
>>>
>>
>>
>>right, but there are subtleties here -- it's not as easy as replacing 
>>pci support with a couple of MSR writes, as the AMD guys have explained 
>>to me.
> 
> 
> Why not? 
> 

routing. The MSRs control routing. The VSM builds a bunch of internal 
data structures and there's a lot of junk you have to do. So, it is 
possible to do all this, but it's not simple.

And we would have to coordinate linuxbios actions with later kernel 
actions (maybe).

ron