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Cisco UCS C460 Server Installation and Service Guide
OL-22326-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Figure 3-28
BIOS Setup Utility Advanced > PCI Configuration Page
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Guidelines for RAID controller booting:
If the RAID controller does not appear in the system boot order, even if the option ROMs for the
RAID controller slots are enabled, the RAID controller option ROM might not have sufficient
memory space to execute. In that case, disable other option ROMs that are not needed for the system
configuration to free up some memory space for the RAID controller option ROM.
•
Guidelines for onboard NIC PXE booting:
If the system is configured to primarily perform PXE boot from onboard NICs, make sure that the
option ROMs for the onboard NICs to be booted from are enabled in the BIOS Setup Utility. Disable
other option ROMs that are not needed to create sufficient memory space for the onboard NICs.
Resolving Insufficient 16-Bit I/O Space
The system has only 64 KB of legacy 16-bit I/O resources available. This 64 KB of I/O space is divided
between two I/O Hubs (IOH0 and IOH1) in the system.
The default BIOS setting is to allocate 40 KB to IOH0 and 24 KB to IOH1. Every PCIe device that is
connected to IOH0 has to share the 40 KB of I/O. Every PCIe device connected to IOH1 must share that
24 KB of I/O.
When a large number of PCIe cards are installed in the system, the system BIOS might not have
sufficient I/O space for some PCIe devices. If the system BIOS is not able to allocate the required I/O
resources for any PCIe devices, the following symptoms have been observed:
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The BIOS might appear to hang while initializing PCIe devices.
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The PCIe option ROMs might take excessive time to complete, which appears to lock up the system.
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PCIe boot devices might not be accessible from the BIOS.
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PCIe option ROMs might report initialization errors. These errors are seen before the BIOS hands
control to the operating system.
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The keyboard might not work.
