Re: PCI spec question/possible VIA quirk?

[Mark Hahn]

> Can anyone tell me what the PCI specs say config registers 0x2c:0x2f 
> should contain? 

via's kt133a spec says 0x2c-2d is "subsystem vendor ID"
defaults to zero, and 0x2d-2f is "subsystem ID" (also def zero).
these are RW, so the bios could put something cute in them, I guess.

ah, yes the vid 0x1043 from your example is AsusTek.  
on my (Asus) A7V133, those bytes are zero.

> In drivers/pci/pci.c (all 2.4.x kernels) pci_read_bridge_bases() 
> is reading "mem_limit_hi" from them.  
> (PCI_PREF_LIMIT_UPPER32 = 0x2c in pci.h) 

again, the kt133a spec says "prefetchable memory base" should
be at register 0x24-25, and "prefetchable memory limit" at 0x26-27.

I'm guessing pci.h should have:

#define PCI_PREF_BASE_UPPER32   0x28    /* Upper half of prefetchable memory range */
- #define PCI_PREF_LIMIT_UPPER32  0x2c
+ #define PCI_PREF_LIMIT_UPPER32  0x2a

(pardon the manual pseudopatch)