aTCA-3710 User's Guide
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6 LMP Subsystem
The aTCA-3710 has two CPUs on the board: the Local Management Processor (LMP) P2041 and the
SmartFusion IPMC. Therefore, on the blade, we have two software suites; the LMP software suite, and
the IPMC software suite. Each software suite comes in the form of a bootloader image and an OS image
in one or more of the flash memories on the board, respectively. The LMP software suite, a dedicated
board management and control plane module, includes the U-boot Bootloader, the Open Linux OS, the
Broadcom Switch software, the IPMI software and the LMP ADLBOMA (ADLINK Board Management).
All the functional modules other than U-boot Bootloader are part of the LMP OS image. The IPMC
software suite, a chassis management module, includes the vendor’s bootloader, OS and IPMI package.
ADLINK patches are applied to the many of the standard modules include the following functions.
z
Booting Image Redundancy
z
Device
drivers
z
H/W
diagnostics
z
S/W image upgrade
6.1 Booting
Image
Redundancy
The aTCA-3710 software package provides booting image redundancy to survive a single point of failure
during the boot process. When a device with a CPU core boots up from an image stored in a storage
device, the system is guaranteed to successfully boot by having redundant bootable images stored
separately in primary and redundant storage devices. The bootloader U-boot image and the Linux
operating system image are stored in different storage devices.
Boot image redundancy applies to the LMP as summarized below.
z
LMP U-boot image redundancy
z
LMP OS image redundancy
6.1.1 U-Boot Redundancy
The U-boot image is stored in an SPI flash memory. On the aTCA-3710, the LMP has two such U-boot
flash memories in a primary and a redundant fashion. To support redundancy, the IPMC is involved in
the flow as shown in .Figure 8 below
