Who decides PCI device number?

Who decides PCI device number?

[Rajat Jain]

Hi,

In the PCI addess (domain + PCI bus num + PCI Device num + function num)
of a PCI device, who decides the PCI device number assigned to a PCI
device? 

- Is it hard wired for a particular PCI slot? (So that any PCI card
plugged into this slot will always have a particular PCI device number).


-Or is it hardwired on the PCI card? (So that this card if plugged on
any slot in any machine will have the same PCI device number)?

Thanks,

Rajat

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Re: Who decides PCI device number?

[Rene Herman]

On 06-08-08 07:54, Rajat Jain wrote:

> In the PCI addess (domain + PCI bus num + PCI Device num + function num)
> of a PCI device, who decides the PCI device number assigned to a PCI
> device? 
> 
> - Is it hard wired for a particular PCI slot? (So that any PCI card
> plugged into this slot will always have a particular PCI device number).

Yes, for a definition of "hard-wired" which if I'm not mistaken (which I 
might be, but believe I remember reading that once) includes the 
possibility for busses to change numbering depending on bridge detection 
order.

But yes, the "dd" in the DDDD:bb:dd.f lspci -D output indeed signifies 
the slot, not the card -- exchange two PCI cards in your system and see 
them change numbering around as well.

> -Or is it hardwired on the PCI card? (So that this card if plugged on
> any slot in any machine will have the same PCI device number)?

No.

Rene.
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