SMART 6873M Artwork, Инструкция по установке и эксплуатации

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U-Boot
ATCA-F125 (6873M Artwork) Installation and Use (6806800J94N) 105
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.
To analyze the kernel log files:
1. Issue a reset.
2. Connect to U-Boot. For more information, see Accessing U-Boot on page 101 .
3. Using the kernel memory map, find the memory addresses of the kernel logs.
4. To display the kernel logfile at any of these memory addresses, enter the following
command:
.printf (<memory address>)
The persistent memory feature can also be useful in the storage of application-specific
data. Use the standard U-Boot variable
pram
to reserve a memory region (at the end of the
physical memory). This allows the reserved region to not be overwritten by U-Boot. U-Boot
reports less memory to the Linux kernel (through the
mem
parameter) so that Linux will not
use it either.
5.6 Memory Map
The following table shows the physical address map of the ATCA-F125.
Table 5-1 Physical Address Map
Device Start Address Size
DDR3-RAM 0x00000000 Max. 2 GByte
P2020 CPU 0xFFE00000 32 Kbytes
FPGA 0xFFDF0000 32 Kbytes
BITS1 0xFFA00000 32 Kbytes
BITS2 0xFFA100000 32 Kbytes
Stand-by boot flash 0xE2000000 32 Mbytes
Active boot flash 0xE0000000 32 Mbytes