Pci Parity; Table 8-10: Troubleshooting Pci Bus Problems - Compaq AlphaServer 1000A Owner's Manual

PCI Parity

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
functions properly as long as parity is not checked. The pci_parity environment
variable for the SRM console allows you to turn off parity checking so that false PCI
parity errors do not result in machine check errors. The ARC environment variable,
ENABLEPCIPARITYCHECKING, has a default setting of FALSE, so that parity is not
checked unless you change the value to TRUE. When PCI parity is disabled, no parity
checking is implemented for any PCI device, even those that produce correct, compliant
parity.
Table 8–10: Troubleshooting PCI Bus Problems
Step Action
1. Confirm that the option is supported, and confirm firmware and software versions.
2. Confirm that the PCI module and any cabling are properly seated.
3. Check for a bad slot by moving the last installed controller to a different slot.
4. Call the option manufacturer or your service representative for help.
Troubleshooting Your System
AlphaServer 1000A Rackmount Owner's Guide 8-15