PCI Configuration Utility Question

Does anybody know about ‘Interrupt Line’ in Device Settings Fields of PCI
Configuration Utility.
What is it(‘Interrupt Line’) really mean?

below there is a posting from Udo Eberhardt (4.7.2002) to this list.
May be this is helpful for you

regards

F.X.

Hi,

in 2k there is a lot that is not there in 98. To be more precise, probably
there is nothing in 2k that was taken from 98 (to be honest, I hope so :wink:

The Interrupt-Line register is used by software only. It provides storage
for the interrupt line that was assigned by software (=BIOS). It has no
meaning for the hardware because PCI devices do not care about interrupt
lines. Each device uses the same INTA line on the bus. The main board (BIOS)
routes the INTA line of each slot to IRQs 0…15. Refer to the PCI spec for
details.

At power on the BIOS assigns hardware resources to each PCI device (if this
feature is enabled by BIOS setup). The IRQ that is assigned for each device
is stored in the Interrupt-Line register of that device.

When Win98 boots up it enumerates all PCI devices. It will use the hardware
resources assigned by the BIOS if this does not cause conflicts with other
devices. If there are conflicts then Win98 may re-confgure particular
devices.

2k does manage all the hardware resources by itself (ACPI mode). It does not
rely on the BIOS except for devices that are requried for booting (HD).
Therefore, it does not need the Interrupt-Line register.

It seems that Win98 wants to see a valid configuration for a device that has
been configured by the BIOS. But, your configuration cannot be valid because
the int line is missing.

I could imagine that the problem does not occur if your device is not
configured by the BIOS at all. Try the following: Go to BIOS setup. If there
is an option labeled “PNP OS” or something like that then set it to PNP OS =
yes. Now your BIOS should configure devices only that are required for
booting.


Udo Eberhardt
Thesycon GmbH, Germany
xxxxx@thesycon.de
www.thesycon.de

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of pigman
Sent: Wednesday, August 07, 2002 12:21 PM
To: NT Developers Interest List
Subject: [ntdev] PCI Configuration Utility Question

Does anybody know about ‘Interrupt Line’ in Device Settings Fields of PCI
Configuration Utility.
What is it(‘Interrupt Line’) really mean?


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Thanks !