The Data Packets for each subfunction each contain a byte field for Return Code. This field contains the return code returned from their respective PCI BIOS call. These return codes are described as follows:

Return Code

Description
00h
Successful
81h
Function Not Supported
83h
Bad Vendor ID
86h
Device Not Found
87h
Bad Register Number
Further Reference can be found in the PCI BIOS Specification Revision 2.0.

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