Configuring ISA and PCI adapters
You cannot assign an ISA adapter to the same interrupt
that you have assigned to a PCI adapter. This is because
the Netfinity 5500 M20 does not support interrupt sharing
among PCI and ISA adapters.
If a situation occurs where you need an additional
interrupt, you can use an interrupt from another function
that you might not need, such as COM2 (Interrupt 3).
To configure ISA adapters, select Plug and Play and
follow the instructions on the screen. See “Plug and Play”
on page 31 and “Plug and Play technology” on page 164
for additional information.
PCI devices automatically communicate with the server
configuration information. This usually results in automatic
configuration of a PCI device. If a conflict does occur, see
“Resolving configuration conflicts.”
Multiple-function PCI adapters use more than one interrupt.
When you install one of these adapters, review the IRQ
assignments in the Configuration/Setup Utility programs
(see “PCI routing” on page 23). Verify that the IRQ
assignments are correct.
The Netfinity 5500 M20 uses a rotational interrupt
technique to configure PCI adapters. This technique
enables you to install a variety of PCI adapters that
currently do not support sharing of PCI interrupts.
Resolving configuration conflicts
The resources used by the server consist of IRQs, DMA,
I/O ports addresses, and memory. This information is
useful when a resource configuration conflict occurs.
Conflicts in the configuration occur if:
A device is installed that requires the same resource
as another device. (For example, a conflict occurs
when two adapters try to write to the same address
space.)
A device resource is changed (for example, changing
jumper settings).
A device function is changed (for example, assigning
COM1 to two serial ports).
A software program is installed that requires the same
resource as a hardware device.
The steps required to resolve a configuration error are
determined by the number and variety of hardware devices
and software programs that you install. If a hardware
configuration error is detected, a
configuration error
message appears after the server completes POST and
before the operating system is loaded. You can bypass
the error by pressing Esc while the error message is
displayed.
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