[syslinux] [PATCH] pci: Introduce slot and function information

[H. Peter Anvin]

Keith Schincke wrote:
> Out of  habit, I would vote for the second option as a more correct
> solution.
> 
> What would be the maximum fixed size of the pci_device array? Which has a
> smaller object code size? Which would have a shorter runtime? Do you have
> pre-built linked list functions?
> 
> I am not a hardware expert, but can't some systems have multiple PCI buses?
> Wouldn't this make it difficult to have a fixed array?
> 

The maximum size is: 256 busses x 32 devices x 8 functions.

The object code size would be slightly smaller for the fixed-size.

Runtime is likely to be inconsequential either way.

I don't have pre-built linked lists, but, sheesh, they're linked lists...

There are systems with multiple PCI busses, and there are systems with 
multiple PCI *domains*.  There is no system-independent way to get to 
the nonzero PCI domains; that needs OS support.  Systems with so-called 
peer PCI busses will be detected in normal order.

	-hpa