Kontron AM5030 IPMI - Manual (Page 37)

AM5030 IPMI Firmware User Guide
ID: 1042-7364, Rev. 1.0 Page 37
7.2.2 Clock Source
When the AM5030 acts as clock source for the PCI-Express reference clock, the clock signal
must be routed also to the PCI-Express Endpoint. The backplane, the carrier’s IPMC or the
MCH must be capable of doing this (Clock E-Keying according to AMC.1 R2.0).
The information which one (AMC clock or local clock) is used as PCI-Express reference clock,
can be directly read from board’s E-Keying Clock Configuration register (ICKEY0) at address
297h.
The ‘DIP Switch SW2’ can be used to forcibly configure the PCI-Express reference clock.
Please refer to the “AM5030 User Guide” for details.
8. uEFI BIOS Failover Control - Automatic Flash
Selection
After each payload CPU reset the Management Controller selects the uEFI BIOS Flash by
applying the related non-volatile parameter. Then it waits for a message from the uEFI BIOS.
This message contains a checksum report, i.e. it reports whether the Boot Flash's checksum
is right or wrong.
If either the checksum is wrong or the message is not received within a given time, then the
currently used uEFI BIOS is assumed to contain an invalid or a corrupted image. In this case
the Management Controller toggles the related non-volatile parameter and generates a “Boot
Error - Invalid boot sector” event. The sensor event is generated either by sensor “FWH0 Boot
Err” or “FWH1 Boot Err”, depending on which uEFI BIOS bank failed.
After selecting the alternate uEFI BIOS bank, the payload CPU is reset and the Management
Controller waits for the checksum report message from EFI again.
The number of retries depends on the error condition (no message from EFI at all or checksum
error).
The number within the names of the two related sensors “FWH0/1 Boot Err” corresponds to the
value of the non-volatile parameter, not to the absolute number of the uEFI BIOS firmware bank
(which is not known by the MMC).
9. Hot Swap
As a hot-swappable field replaceable unit (FRU), the AM5030 also follows the same stringent
carrier grade RASM feature set, namely - Reliability, Availability, Serviceability, Maintainability.
When offered in combination with AdvancedTCA platforms, TEM (Telecom Equipment Manu-
facturers) clients literally conserve valuable system AdvancedTCA system slots. The AM5030
supports Full Hot Swap capability as per PICMG 3.0. It can be removed from or installed in the
system while it is on (without powering-down the system). Please refer to the PICMG 3.0 spec-
ification for additional details.
During Hot Swap of a working module the payload side has to be shut down automatically on
command of the MMC and the end of shut down has to be signalled back to the MMC. Because
the AM5030 supports ACPI, an OS on the payload side which supports this too makes shut
down very easy. If the OS doesn't support ACPI there is a special method to be used.