O base address register – AMD HYPERTRANSPORT 8151 User Manual
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Product Errata
25912 Rev. 3.06 March 2006
AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel
Revision Guide
28 The AMD-8151™ Tunnel Lacks Extended Configuration Space
Memory-Mapped I/O Base Address Register
Description
Current AMD processors do not natively support PCI-defined extended configuration space. A
memory-mapped I/O base address register (MMIO BAR) is required in chipset devices to support
extended configuration space. The AMD-8151 does not have this MMIO BAR.
Potential Effect on System
The AMD-8151 is not a PCI-X
®
Mode 2 or PCI Express
®
capable device and is not required to
support the MMIO BAR. However, using a device with an MMIO BAR and an AMD-8151 on the
same HyperTransport™ link of the processor may cause firmware/software problems.
Suggested Workaround
It is strongly recommended that system designers do not connect the AMD-8151 and devices that use
extended configuration space MMIO BARs (ex: HyperTransport-to-PCI Express bridges) to the same
processor HyperTransport link.
Fix Planned
No