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76 MegaRAC® M300V Card Implementer’s Reference and User’s Guide
Management Subsystem Host Interface Type Encoding
Interface Definition
Encoded Value
KCS Interface
000b
Block Transfer Interface
001b, Hardware available, not implemented in Firmware
SMIC Interface
Not Used By M300V
SMBus Interface (SSIF)
Reserved
Reserved
mCard in upgrade kit mode
110b
Interface type not initialized
111b
To avoid race conditions associated with the configuration of the INTERFACE_ID bits, the BIOS
should sample these bits for up to 25 seconds after having determined that the MegaRAC M300V
card is present by using the MCARD_DETECT_L signal. Most likely the BIOS will not have to
wait this long during system boot up for the BMC to be ready, but some BMCs take a longer time
to initialize. Any delays would only be noticed when AC power is applied to a system and the
system is immediately configured to boot up without further intervention. No delay would be
noticed by the BIOS during POST caused by system reset or by boot up from any ACPI state other
than mechanical off. This is because the BMC is powered at all times except during the
Mechanical Off state.
If the interface ID bits remain 111b for the full 25 seconds, BIOS should assume that a problem
exists with the MegaRAC M300V card and print this fact to the POST screen. BIOS must wait an
additional 50 ms beyond the initial detection of any pattern other than 111b before taking a final
INTERFACE_ID reading. This allows slower BMC microcontrollers enough time to set up these
bits if the controls for them reside in multiple BMC registers.
IPMI Command Hardware Interface Support
The host system BIOS must contain basic IPMI command support for some or all supported IPMI
2.0 command interfaces using KCS only. If the BIOS does not have any IPMI command firmware
support for the IPMI interface that indicates that the BMC is available, the BIOS must print to its
POST screen that the MegaRAC M300V card was detected and that it has exposed the indicated
IPMI command interface, but that BIOS does not support that IPMI command interface.
IPMI Command BIOS Interface Support
The system BIOS must support all of the BIOS-Firmware interaction specific commands defined
in the AMD OPMA spec.
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