Kontron AM4901 IPMI - Manual (Page 21)

AM5901/AM4901 IPMI Firmware User Guide
ID: 1035-8760, Rev. 3.0 Page 21
Example: OM6040D has no Fclock but slot to slot connections for it. The Fclock must be
provided by an AMC.
• 'rack': It is known that a backplane: a) offers an Fclock source permanently; or b) there is
a non-standard method to switch on and off the Fclock source for any slot. For both cases
a) and b) no Fclock e-keying will be performed at all. I.e. the modules will not receive any
clock control commands. For case b) the slot's Fclock will be switched on/off if a PCIe
connection between two AMC modules will be activated/de-activated. Note: Kontron Pro-
cessor AMC boards need no support for that. Either they are always able to be clock re-
ceiver or they are initialized as a clock receiver when PCIe becomes active during port
e-keying.
Example for case a): OM6062, OM6063 or compatible systems have a permanent
Fclock.
Example for case b): OM6060 or compatible systems have a switchable Fclock.
• 'manu': If 'spec' mode or 'rack' mode is not possible or not satisfying the manual mode
can be selected. Use the CLI command 'fclockopts manu' to invoke that mode. Normally
additional parameters have to be set before. Please refer to the description of this CLI
command and the special chapter in the following.
3.5.2 Manual Fclock Mode
The fclockMode "manu" should permit operation with any desired PCIe module configuration
on a backplane where at least the required physical connections for Fclock and PCIe lines be-
tween one or more pairs of slots are implemented.
These low cost MCHs provide neither an Fclock generator nor a PCIe switch. However, under
certain circumstances depending on the backplane configuration, it may be possible to over-
come this situation and achieve satisfactory operation. For further assistance, contact Kontron.
Another problematic situation occurs if an AMC module is not able to process the 'Set Clock
State' IPMI command. This command is mandatory during a spec conformant PCIe e-keying to
set an AMC's fclock to source or receiver. If an AMC module does not process this command
the e-keying will not be finished successfully. The problem may be solved by choosing the man-
ual ('manu') fclock mode and set the AMC module's 'fclock strategy' to 'Do not influence the
AMC's Fclock behavior'. In that case the AMC module is supposed to be a clock receiver.
Please note that for the partner AMC the behavior has to be set as well. Please refer to the
fclockopts parameters being described below.
To solve these and similar problems if e.g. backplane FRU data for the Fclock are missing or
wrong or it is desired to force the behavior of modules during the Fclock e-keying the manual
mode can be used. The following describes what is possible.
For every slot ('source slot') the following may be defined:
• an Fclock strategy
• a remote slot
The CLI command to be used is:
fclockopts manu <source slot> <Fclock strategy> <remote slot>