Problem When The Pcie Link Fails To Train As X8 (Cr 6556505); To Identify The Problem; To Correct The Problem - Fujitsu SPARC Enterprise T5120 Product Notes

Problem When the PCIe Link Fails to Train as x8
(CR 6556505)
The system could encounter a problem during a power-on or reset sequence where
the I/O bridge (PCIe root complex) of the UltraSPARC T2 CPU does not train at all
or trains at a lane width less than 8, and no error or fault is generated to indicate to
the user this problem has been encountered.

▼ To Identify the Problem

Though no error or fault is reported, it is easy to identify because no PCIe I/O
devices will be available to the system. If you power on the system, or reset the
domain and try and boot from a disk or network device, and you get an error similar
to the following:
{0} ok boot disk
Boot device: /pci@0/pci@0/pci@2/scsi@0/disk@0
ERROR: boot-read fail
Can't locate boot device
{0} ok
1. At the ok prompt, issue the show-devs command.
2. Check the output to for PCIe devices.
If no PCIe devices are displayed, the server has encountered this problem.
Note – All PCIe devices begin with the path /pci@0/pci@0.

▼ To Correct the Problem

1. Take down all domains and power off the system.
38 SPARC Enterprise T5120 and T5220 Servers Product Notes • April 2010
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