Pci Bus Problems - Compaq AlphaServer DS20E Reference Manual

8.9

PCI Bus Problems

PCI bus problems at startup are usually indicated by the inability of
the system to detect the PCI device. The following steps can be used to
diagnose the likely cause of PCI bus problems.
1. Confirm that the PCI option card is supported and has the correct firmware
and software versions.
2. Confirm that the PCI option card and any cabling are properly seated.
3. Check for a bad PCI slot by moving the last installed PCI controller to a
different slot.
4. Call the option manufacturer for help.
PCI Parity Error
Some PCI devices do not implement PCI parity, and some have a parity
generating scheme that may not comply with the PCI specification. In such
cases, the device should function properly if parity is not checked.
Parity checking can be turned off with the set pci_parity off command so that
false PCI parity errors do not result in machine check errors. However, if you
disable PCI parity, no parity checking is implemented for any device. Turning
off PCI parity is therefore not recommended or supported.
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Troubleshooting 8-11