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MVME2500 Installation and Use (6806800L01H)
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3. TFTP the files from the server to local memory, then boot:
run vxboot
6.4 Using the Persistent Memory Feature
Persistent memory means that the RAM's memory is not deleted during a reset. Power cycling,
or by temporarily removing the power and then powering up the blade again, will delete the
memory content. Persistent memory feature is enabled by default.
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
When a board that is running the Linux OS indicates a kernel panic, issue a reset (through the
face plate button, for example) to analyze the cause, then subsequently analyze kernel log files.
The persistent memory feature keeps the log files available in the memory.
To analyze the kernel log files:
1. Issue a reset.
2. Connect to U-Boot. For more information, see Accessing U-Boot on page 103.
3. Enter the following command to obtain memory addresses of the kernel log
files:.locate_kernel_log (1)
The memory addresses of any found kernel log files will be displayed.
4. Enter the following command to display the kernel logfile at any of these memory
addresses: .printf (<memory address>)
The persistent memory is useful in application-specific data storage. The standard U-Boot
variable pram can be used to reserve a memory region at the end of the physical memory to
prevent it from being overwritten. U-Boot reports less memory to the Linux kernel through the
mem parameter, indicating that the operating system should not use it either.
For more information, see the U-Boot documentation.