Below are the formats for a few useful IPMI commands for the AMC13 as provided by Jes Tikalsky (jtikalsky@hep.wisc.edu) with the University of Wisconsin group.

For a more in depth look at the Status and Control Registers for the MMC FPGA SPI Interface, see the Wisconsin official MMC documentation

SPI Read

Below are the relevant bytes for a raw IPMI SPI "read data" command

NetFN   0x32
CMD     0x34
Params  PortID (0-3)
        Address LS Byte
        Address MS byte
        Count (I recommend <20)

SPI Write

Below are the relevant bytes for a raw IPMI SPI "write data" command

NetFN   0x32
CMD     0x33
Params  PortID (0-3)
        Address LS Byte
        Address MS byte
        Count (I recommend <20)
        Byte 1
        ...
        Byte n

Read SPI Status

Below are the relevant bytes for raw IPMI SPI "read status register" command

NetFN   0x32
CMD     0x31
Params  1: Port ID (0-3)
Return  1: bit 7: HF1
           bit 6: HF2
           bit 5: CFGRDY
           bit 4: REQCFG
           bit 3-0: reserved

Write SPI Control

Below are the relevant bytes for a raw IPMI SPI "write control register" command. For the purposes of the AMC13, we really only care about the CFGRDY bit

NetFN   0x32
CMD     0x32
Params  1: Port ID (0-3)
        2: bit 7: select UHF for update
           bit 6: select LHF for update
           bit 5: select CFGRDY for update
           bit 4-2: 0
           bit 1: SET selected flags
           bit 0: CLEAR selected flags

-- DavidZou - 30 May 2013