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Article #644

Re: IRQ holder for PCI steering

#644
From: newsman
Date: Wed, 27 Oct 1999 00:00
78 lines
4173 bytes
> >Description of PCI Bus IRQ Steering
> >IRQ Steering may be displayed as disabled in Device Manager for any of
the following reasons:
> >
> >The IRQ routing table that must be provided by the BIOS to the operating
system may
> be missing or contain errors. The IRQ routing table provides information
on how the
> motherboard is configured for PCI IRQ's.
>
> OK, I got this problem. How do I fix the IRQ routing table? Please
> respond.

Hmmmmm......difficult don't remember your exact problem, maybe some,MORE
INFORMATION.

When PCI bus IRQ steering is enabled, Windows dynamically assigns or
"steers" PCI bus IRQs to PCI devices. If there are IRQ conflicts between PCI
devices, you may need to disable PCI bus IRQ steering to determine where the
conflicts occur. To disable PCI bus IRQ steering, follow these steps:

1. Click Start, point to Settings, click Control Panel, and then
double-click

   System.


2. Click the Device Manager tab.
3. Double-click the System Devices branch.

4. Double-click PCI Bus, and then click the IRQ Steering tab.

5. Click the Use IRQ Steering check box to clear it, click OK, and then
click OK
   again.


6. When you are prompted to restart your computer, click Yes.

   NOTE: If you click No instead of Yes when you are prompted to restart
your
   computer, the changes do not take affect.

NOTE: You may also have to disable PCI bus IRQ steering in your computer's
basic input/output system (BIOS). For information about how to do so,
contact you BIOS manufacturer. The following settings determine which
routing tables Windows uses when programming IRQ steering:

Get IRQ table using ACPI BIOS:
When this check box is selected, the ACPI BIOS IRQ routing table is the
first table Windows tries to use to program IRQ steering. If a PCI device is
not working properly, click this check box to clear it.

Get IRQ table using MS Specification table:
When this check box is selected, the MS Specification routing table is the
second table Windows tries to use to program IRQ steering.

Get IRQ table from Protected Mode PCIBIOS 2.1 call:
When this check box is selected, the Protected Mode PCIBIOS 2.1 routing
table is the third table Windows tries to use to program IRQ steering.

Get IRQ table from Real Mode PCIBIOS 2.1 call:
When this check box is selected, the Real Mode PCIBIOS 2.1 routing table is
the fourth table Windows tries to use to program IRQ steering.

NOTE: By default, the "Get IRQ table from Protected Mode PCIBIOS 2.1 call"
check box is not selected. You should only click this check box to place a
check mark if a PCI device is not working properly.


IRQ Holder For PCI Steering may appear under IRQ Routing Status even though
PCI bus IRQ steering is disabled. This can occur if the IRQ settings are
being read by your computer's BIOS. For information about modifying the
BIOS, contact your BIOS manufacturer.

> George D. Freeman IV
--
Newsman
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From: "newsman" <newsman@nospam.demon.nl>
Subject: Re: IRQ holder for PCI steering
Date: 1999/10/27
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