Stefan Reinauer <[EMAIL PROTECTED]> writes:

> Segher Boessenkool wrote:
>>> In practice the subsystem vendor IDs are quite arbitrary and definitely not
>>> the same for all PCI devices per mainboard
>>
>> They aren't even allowed to be the same for all devices on a mainboard:
>> the subsystem IDs should uniquely identify the device, without having
>> to look at the "regular" IDs as well.
> Again, mind me asking. Where did you find this definition?

Section 6.2.4 of the PCI specification states:

> These registers are used to uniquely identify the add-in card or subsystem
> where the PCI device resides.  The provide a mechanism for add-in card 
> vendors to
> distinguish their add-in cards from one another even though the add-in cards 
> may
> have the same PCI controller on them (and therefore the same Vendor ID and 
> Device ID).

Or in paraphrase they identify the PCB the IC sits on.


Eric

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