User Manual

IPMI Firmware User Guide CP6002
Page 16 ID: 1039-1613, Rev. 2.0
5. Communication Between the Management
Controller and EFI
For communication between EFI and the Management Controller there is a “private” KCS in-
terface. During the boot process the EFI sends the following IPMI commands to the Manage-
ment Controller:
• An OEM command which reports a good or a bad checksum.
• A Standard IPMI command “Set Watchdog Timer” to stop a possibly running IPMI
watchdog timer.
• A Standard IPMI command “Set SEL Time” to set the event log time to the time which is
kept by the RTC.
• The OEM IPMI command “Set Firmware Parameters” with some parameters which for
example sets the Management Controller to a BMC or a SMC as selected in the EFI shell.
• A Standard IPMI command “Set ACPI Power State” to set the state “ACPI legacy on”
•Etc.
6. Hot Swap and Shut Down
6.1 Hot Swap Handle and Hot Swap (Blue) LED
The blue Hot Swap LED (HS LED) of an inserted board in a powered rack is normally used to
indicate the board's operational status so as to facilitate hot-swapping of the board:
•ON
The payload is inactive and may be:
• Activated by closing the Hot Swap Handle, or
• The board may be extracted. The “M-state” is 1.
An exception is the case when payload power is off e.g. after a shut down via an
IPMI chassis command and the handle is still closed. Here the M-state is 4. To
show the operator that the payload power is off, the blue LED will be on in spite of
the closed handle.
•BLINKING
Changing from active state to inactive state or vice versa.
Don't extract the board now. The “M-state” is 2, 5 or 6.
•OFF
The payload is active.
Don't extract the board now. Normally the extraction is impossible because the handle is
closed and locked. The “M-state” is 3 or 4.