SMART Embedded Computing 6806800V18A, Installation And Use Manual

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156 AXP1440-C07 Installation and Use (6806800V18A)
Shelf Management Module
Shelf Management Module
7.7 Power
The SAM1620-D uses dual +12V power feeds, one from each PEM. Hot swap circuitry
ensures correct operation when a SAM1620-D is inserted into or removed from a live
system.
7.8 SAM1620-D Software
The software that runs on the shelf manager is described in detail in the
Pigeon Point
Systems IPM Sentry Shelf Manager User Guide
, which provides an introduction to shelf
management, the shelf manager, and the shelf management mezzanine. Also available is
the
Pigeon Point Systems IPM Sentry Shelf-External Interface Reference
which describes
the command line, web, SNMP (Simple Network Management Protocol), and RMCP
(Remote Management Control Protocol) interfaces. Refer to
Appendix A
for more
information on these publications.
7.8.1 imls Utility
A utility called
imls
is available on the SAM1620-D. It can be used to list all firmware
images present in flash. The shelf manager flash is divided into two banks. Each bank
contains a set of three separate firmware images:

U-Boot

RFS

Kernel images
When the
rupgrade_tool
utility is used to perform a reliable firmware upgrade operation
on the shelf manager, the flash bank that is currently not active is programmed with the new
images, the processor is reset, and the newly programmed flash bank is selected.
If the new firmware fails to load or execute properly, the shelf manager automatically resets
and reverts to the previous flash bank. Selection of the bank to be used for booting is not a
configurable option at run-time.
The following text shows sample output obtained by running
imls
at the shelf manager
Linux prompt.
The first three images listed reflect the currently active flash bank contents. The next
set of three images is contained within the other flash bank.