U-Boot
ATCA-F140 Installation and Use (6806800M67H)
105
5.4
Selecting the Boot Flashes
This configuration determines which flash the blade is to boot from on the next restart. You can
either boot through IPMI or through a U-Boot command.
Using IPMI - This option uses the System Boot Options feature. For more information, see
the ATCA-F140: Control using IPMI Programmer’s Reference.
Using U-Boot command - Use
bootsel 0|1|switch
, where 0 selects boot flash 0, 1
selects boot flash 1 and switch selects the currently stand-by boot flash.
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-F140.
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
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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Содержание 6806800M67H
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