RE: Slot number in Desk-top - huh?

["O'Shea, David J" <david.j.oshea@intel.com>]

Mike,

The discussion tracked into the $PIRQ table (the Win9x)
table because that table provides the PCI Bus#/Dev#/Func#
to SLOT labeling information of which you speak.

So contrary to your assertion, the information is actually
provided.   See $PRQ->Slot_Entry->Slot_Number

So slot numbering temporarily morphed to IRQ because both
sets of info are in the same table.

-Daveo

-----Original Message-----
From: Mike Dini [mailto:mdini@dinigroup.com]
Sent: Wednesday, January 08, 2003 11:10 AM
To: pci-sig@znyx.com
Subject: Slot number in Desk-top - huh?


I'm confused as to how the original question deviated into the IRQ's, 
unless I misunderstood the original question.  I thought Dinesh asked the 
following question (paraphrasing):

    I have a board plug into PCI/PCIX/ et al.
    How does the driver determine the physical
    location of that board?

My private answer to him went as follows:

You can't.  This is a fundamental problem with PCI and it is a problem we 
have all the time.  On a PCI bus, you can figure what board is plugged in, 
but it is impossible to determine which physical slot the board is plugged 
into.  This is all PCI, not just Sun.  This can be quite troublesome if you 
put two of the same boards into a system and, for example, they get cabled 
differently to something external.

The only way to solve this is to put a DIP switch on the PWB or add some 
sort of an ID to the circuit.  Upon installation, the user (or other) must 
tell the driver which of these ID's in connected to which function.

Now I state again in clearer prose:  Across platforms, it is impossible in 
PCI to correctly determine the physical location of a PCI resource without 
some external intervention.

Agree/Disagree?

>|
>| Hi Experts,
>|
>| I have a basic qry.
>| In a desk-top environment, is there a mechanism to find out which
>| PCI card/resource is plugged in to which slot ? In other words, is
>| it possible in OS level  to read slot number of a particular PCI
>| card plugged in to a desk-top ?  Assume the machine is running in
>| Solaris/Linux.
>| Any one experienced similar problems ?
>|
>| Thanks in advance
>|
>| Dinesh