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As described in u-boot readme file

In case you didn't know, the DULG is also a great source of info. http://www.denx.de/twiki/bin/view/DULG/Manual

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to run hello_world example we have to write "loads" but this command doesnt seem to work with me and give the following msg Unknown command 'loads' - try 'help'

Make sure you have CFG_CMD_LOADS (or CONFIG_CMD_DFL) included in the definition of CONFIG_COMMANDS your board's config header file.

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and when i give the command go 40004 Hello World! This is a test. following error msg appears ## Starting application at 0x00040004 ... Bus Fault @ 0x00000700, fixup 0x00000000 Machine check in kernel mode.

This is expected behavior if you haven't loaded the program.

Regards, -Craig