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U-Boot
ATCA-F125 (6873M Artwork) Installation and Use (6806800J94K)
105
Generally, there is a fixed link between the U-Boot firmware and the kernel image in the
respective boot flash. This means that when the U-Boot in a particular flash is executed, it
subsequently boots the kernel image in the same flash.
If necessary, however, you can select the kernel to boot manually using the following
commands:
setenv kerneladdr e0000000
(for the kernel in the currently active boot flash)
setenv kerneladdr e2000000
(for the kernel in the currently stand-by boot flash).
Use these commands with care.
5.5
Using the Persistent Memory Feature
Persistent memory means that the memory RAM is not deleted during a reset. Memory
content can be deleted by performing a power cycle or by temporarily removing the power and
then powering up the blade again. This feature is enabled by default on the ATCA-F125.
This feature can be useful in many situations, including:
Analyzing kernel logs after a Linux kernel panic
Defining a particular memory region for the persistent storage of application specific data
Analyzing Kernel Log Files after a Kernel Panic
If the Linux OS running on the ATCA-F125 indicates a kernel panic and you wish to analyze the
cause, then you can issue a reset (using the face plate button for example) and subsequently
analyze kernel log files. Because of the persistent memory feature, these log files are still
available in the memory.
Each of the two U-Boot firmware images in the two flashes holds a separate set of U-Boot
environmental variables/boot parameters. Therefore, after switching to another boot flash,
you may need to reconfigure the boot parameters/environmental variables of the new U-
Boot image according to your needs.
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