Re: PCI Express support for 2.4 kernel

[Vladimir Kondratiev]

Dan,

all your statements are correct. Indeed, all PCI devices works without 
extra knowledge about PCI-E.
I have nothing to add.
Vladimir.

Dan Hopper wrote:

> Linus Torvalds <torvalds@xxxxxxxx> remarked:
>  
>
> > On Wed, 17 Dec 2003, Geert Uytterhoeven wrote:
> >    
> >
> > > For the record: PCI Express is _not_ PCI-X.
> > >      
> > Ok, but "PCI Express" is too damn long to write, so we'll have to have 
> > _some_ sane name for it without typing for half an hour.
> >    
>
> FWIW, "PCI-E" is in common use in these parts.
>
> Also, wrt the config space backward compatibility issue, it is my
> understanding that the PCI-E root complex and PCI-E devices can be
> enumerated and used successfully with no software changes, within
> the constraints of PCI.  The BIOS or OS should be able to enumerate
> devices, probe BARs and assign resources, perform basic error
> handling, etc. without any PCI-E-specific changes. 
>
> The hardware is required to be able to initialize PCI-E links, set
> things up to sane states, and so forth without software assistance
> in order to make this magic happen.  It would be interesting to hear
> from Vladimir as to whether or not this is happening with his PCI-E
> test system.
>
> Having said all that, it's obviously preferable to end up with
> native OS and BIOS support for the PCI-E extended configuration
> space, extra error reporting mechanisms, etc.  Native PCI-E devices
> hanging off the bus somewhere might not work (or, at least, work
> well) with an OS that doesn't grok the PCI-E extensions.  
>
> Dan
>  

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