Download UPA to PCI Interface User`s Manual

11.2
Unreported Errors
Certain error conditions are not reported by the U2P. Examples of these errors are
listed below. Please beware that this list may not enumerate all unreported errors.
■
A non-cacheable write from U2P to a non-existing or disconnected UPA port.
■
A write to a read-only register in U2P is ignored.
■
A non-cacheable write transaction from U2P that is directed to cacheable address
space.
■
A read from a write-only register in U2P returns unknown data, but no error.
■
A UPA bus error or timeout during a DVMA write is ignored.
■
Sending an interrupt to a non-existing or disconnected UPA port.
Chapter 11
Error Handling
11-9