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Installing or Replacing Server Components
Figure 3-28
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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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Cisco UCS C260 Server Installation and Service Guide
3-52
BIOS Setup Utility Advanced > PCI Configuration Page
Guidelines for RAID controller booting:
When this server is configured in the factory, the RAID controllers are installed in PCIe Slot 3 or
Slot 5 for single RAID controller configuration, or in both Slot 3 and Slot 5 for dual RAID controller
configuration.
If the server is configured to boot primarily from RAID storage, make sure that the option ROMs
for Slot 3 and/or Slot 5 are enabled in the BIOS, depending your RAID controller configuration. If
the RAID controller does not appear in the system boot order even with the option ROMs for Slot
3 and Slot 5 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.
The BIOS might appear to hang while initializing PCIe devices.
The PCIe option ROMs might take excessive time to complete, which appears to lock up the system.
Chapter 3
Maintaining the Server
OL-24342-01
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