Kontron AM4901 IPMI - Manual (Page 16)

IPMI Firmware User Guide AM5901/AM4901
Page 16 ID: 1035-8760, Rev. 3.0
3. System Initialization and Operation
As long as the MCH is active (Hot Swap switch closed, blue LED off) it supports all of the sys-
tem units and AMC modules under its control by activation and deactivation.
3.1 Preparation
3.1.1 Supervision of AMC Modules
Only AMC modules which are recognized by the MCH can be supervised (activated, monitored,
or deactivated) by the MCH. In systems which contain standard power modules, the MCH nor-
mally recognizes automatically if a slot is occupied by an AMC module or not. In this case, op-
erator intervention is not required.
When the MCH is installed in low cost systems which do not employ standard power modules,
the occupation of an AMC slot by an AMC module is not automatically recognized. Therefore
it is necessary to inform the MCH during the first system initialization that an AMC slot is occu-
pied or not, and, if occupied, that the installed AMC module is to be supervised.
Before removing a supervised AMC module, it should be indicated to the supervisor that the
slot is not occupied. Then after installation of an AMC module in the empty slot, it should be
indicated to the supervisor that the slot is once again occupied. Supervision of a physically not
occupied slot results in unnecessary communication errors, system loading, and leads to erro-
neous operations.
The CLI command “slot” and the OEM IPMI command “SetSlotPresenceParameter” serve to
indicate whether or not an AMC slot should be supervised. This is only required for a rack of
the type OM6062.
3.1.2 Power Management and Activation Override
Sometimes during tests it is convenient to have a CPU module in the rack which is permanently
powered and not affected by activation and deactivation of other modules or the MCH or even
soft resets (CLI command 'rs') of the MCH. This permanently powered CPU module may be
used to communicate with the IPMI system via the CPU module's KCS interface e.g. using the
free tool 'ipmitool'.
To configure a module for this type of operation, perform or ensure the following. The module's
Hot Swap switch must be in open state and the module must be deactivated. Power this mod-
ule unconditionally by using the CLI command 'pwr' or the OEM IPMI command 'Set Permanent
Power Parameter'. Example for slot 3: 'pwr on 3'. The module's payload system will be powered
and start. Please note that no E-keying for that module has been performed and therefore com-
munication with devices on other boards might fail. To end the module's permanent powered
state, shut down the payload system if needed before applying the CLI command or IPMI OEM
command to switch off the permanent power.
3.2 Basic Functions after Power On
When a system is powered up, all devices (the MCH and AMC modules) in the system are ac-
tivated (or not) depending on the position of the their Hot Swap switches. Logically, activation
of the AMC modules can only take place after the MCH itself has been activated and if the AMC
modules are supervised.