Specifications

AlphaServer 1000A Owner's Guide Troubleshooting • 8-15
PCI Bus Problems
PCI bus problems at startup are usually indicated by the inability of the system to
detect the PCI device. Use Table 8-10 to diagnose the likely cause of the problem.
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.
Monitor and Terminal Problems
If the system starts up but has no startup display when you turn on the system, refer
to Table 8-11.