3-50
Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Installing Multiple PCIe Cards and Resolving Limited Resources
When a large number of PCIe add-on cards are installed in the server, the system might run out of the
following resources required for PCIe devices:
•
Option ROM memory space
•
16-bit I/O space
The topics in this section provide guidelines for resolving the issues related to these limited resources:
•
Resolving Insufficient Memory Space to Execute Option ROMs, page 3-50
•
Resolving Insufficient 16-Bit I/O Space, page 3-51
Resolving Insufficient Memory Space to Execute Option ROMs
The system has very limited memory to execute PCIe legacy option ROMs, so when a large number of
PCIe add-on cards are installed in the server, the system BIOS might not able to execute all of the option
ROMs. The system BIOS loads and executes the option ROMs in the order that the PCIe cards are
enumerated (slot 1, slot 2, slot 3, and so on).
If the system BIOS does not have sufficient memory space to load any PCIe option ROM, it skips loading
that option ROM, reports a system event log (SEL) event to the CIMC controller, and reports the
following error in the Error Manager page of the BIOS Setup utility:
PCI OUT OF RESOURCES CONDITION:
ERROR: Insufficient PCI Resources Detected!!!
System is running with Insufficient PCI Resources!
In order to display this message some
PCI devices were set to disabled state!
It is strongly recommended to power off the system
and remove some PCI/PCI Express cards from the system!
To continue booting, proceed to <Save & Exit> Menu Option
and select Boot Device or <Discard Changes and Exit>.
WARNING: If you choose to continue booting some Operating
Systems might not be able to complete boot correctly!
To resolve this issue, disable the option ROMs that are not needed for system booting. The BIOS Setup
Utility provides the setup options to enable or disable the option ROMs at the PCIe slot level for the
PCIe expansion slots and at the port level for the onboard NICs. These options can be found in the BIOS
Setup Utility
Advanced
PCI Configuration
page (see
Figure 3-26
).
