Kontron AM4120 IPMI Firmware - Manual (Page 24)

Functional Description AM4120 IPMI Firmware
Page 18 ID 1045-9586, Rev. 1.0
3.4.1 Usage if a Shutdown Daemon is Announced as Present
If a timeout time has to be set to avoid an endless waiting for the sleep state, the daemon calls
this command after system start with the “set quiesce wait timeout” bit set and the “Quiesce
wait timeout” time <> 0. Afterwards, the daemon calls this command cyclically with the “OS
daemon present” bit set. When the MMC gets a FRU Control (Quiesce) request from the carrier
(e.g. during a hot swap sequence), it sets the “quiesce request (FRU Control)” bit in its com-
mand response. After the daemon sees this bit set in the response, it should shut down the
system. After having set the “quiesce request (FRU Control)” bit, the MMC starts the timeout
timer (if a timeout time was defined) and monitors the sleep signal line to recognize the sleep
state which should be caused by the shutdown. When the MMC detects the sleep state (signal)
or it receives a command with the “quiescence acknowledge” bit set or the timeout timer has
expired, the MMC sends a “Module Hot Swap Event” message to the carrier, and in the follow-
ing the payload power will be switched off.
3.4.2 Usage if no Shutdown Daemon is Announced as Present
If no command call announces that a daemon is present, the MMC automatically uses the de-
fault timeout time 0 (endless wait) during the hot swap process. But if the timeout time was set
to a value 1…255, this time will be used in any case while waiting for the sleep state (signal).
Settings changed with this command are volatile (in particular quiesce timeout and OS daemon
present). Bits [6:5] are always settable, but once the quiesce request comes, they cannot be
cleared until quiescence state is entered and exited.