Kontron AM4020 IPMI Firmware - Manual (Page 37)

AM4020 IPMI Firmware
ID 1036-5671, Rev. 2.0 Page 29
P R E L I M I N A R Y
5. Firmware Code
5.1 Structure and Functionality
MMC firmware code is organized into boot code and operational code (IPMI firmware). Both
are stored in the internal flash of the micro-controller.
An additional external SPI flash device is used for holding redundant copies of the operational
code. This additional flash device is organized to have two banks. One of them will always hold
a copy of the active operational code. The other firmware bank holds either a newly download-
ed firmware or the 'previous good' operational code for rollback.
Upon an MMC start or reset, the controller first executes the boot code. The boot code will
check the status of the firmware banks and calculate a checksum of the operational code. Upon
successful verification of the operational code checksum, the firmware will execute the opera-
tional code. The operational code is upgradable in the field.
5.2 MMC Firmware Configuration
For initial setup and to get some basic information on the AM4020 MMC, use the AM4020
uEFI Shell or external IPMI access. For further information refer to the AM4020 uEFI BIOS
User Guide, Chapter 6, uEFI Shell.
Beside the built-in uEFI Shell commands, the Kontron uEFI implementation provides a
number of additional commands, related to the specific hardware features of the system.
The Kontron uEFI Shell command for configuration of the system management is the kipmi
command. The kipmi command provides a set of parameters to support various IPMI
management controllers. Note that not all parameters have an impact on the AM4020 MMC.
For a complete list of the
kipmi parameters, refer to the AM4020 uEFI BIOS User Guide,
Chapter 6, uEFI Shell.
5.2.1 KCS Interface Interrupt
The default factory setting of a AM4020 for its KCS interface is “no IRQ”. When changing the
configuration, the uEFI BIOS creates/updates an entry in the SMBIOS table. This record
contains the following information (among others):
• type of the supported interface (KCS style)
• selected interrupt (10, 11 or none)
This interrupt configuration is needed by the operating system’s KCS interface kernel driver
when it is loaded.
Changing the KCS interrupt number using the kipmi irq uEFI Shell command requires a restart
of the uEFI BIOS. To restart the AM4020, issue the reset uEFI Shell command.