Messages that report failures to allocate I/O resources might appear in POST and in log files.
For example, you might see:
Sep 8 15:50:49 nsg14-28 kernel: PCI: Failed to allocate I/O resource #2:20@0 for 0000:8d:00.0 Sep 8 15:50:49 nsg14-28 kernel: PCI: Failed to allocate I/O resource #2:20@0 for 0000:8d:00.1
Workaround
BIOS tries to allocate I/O resources. If it is unable to allocate I/O resources successfully, it displays error messages.
The OS might try to allocate I/O resources as well. However if it tries, it fails and generates additional failure messages because it uses the same method as BIOS. However, most drivers can manage this condition.
Usually, you can ignore these messages.
If you continue to experience I/O resource issues, refer to I/O and Interrupt Resource Allocation in Sun Server X2-8 (formerly Sun Fire X4800 M2) Installation Guide.