Kontron AT8242 - Manual (Page 88)

Software Setup
72 AT8242
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4 - Start the USB controller, type this in u-boot prompt:
# usb start
5 - Copy the firmware file from the eUSB storage device to board memory:
# fatload usb 0:1 0x2000000 [firmware_file]
6 - Start the new firmware from memory:
# bootoctlinux 0x2000000 console=ttyS0,115200 coremask=ffffffff
5.1.1.4 Booting Firmware Image From Onboard JFFS2 Flash Partition
First of all, select the JFFS2 partition, in AT8242 there is a flash partition named ’’user_jffs2’’ that can be
used a storage space:
# chpart user_jffs2
Note: This partition is also available in linux /mnt directory.
To list all files included in the jffs2 partition:
#ls
To load in the memory a file from the jffs2 partition (simple exec or linux binary):
# fsload ${loadaddr} [file]
Next use ’’bootoct’’ or ’’bootlinux’’ u-boot command to boot the binary file from memory
5.1.1.5 U-boot Memory Configurations
Some of the memory configurations need to be done manually using u-boot environment variables.
The following are the possible memory configurations:
1 - Configuring the DDR clock / data rate:
# setenv ddr_clock_hertz [CLOCK]
[CLOCK] = DDR clock in hertz, the real data rate will be de double of this value.
Here is an example:
# setenv ddr_clock_hertz 533333333
Will configure the DDR clock at 533Mhz, the data rate will be 1066Mhz.