[U-Boot] debug uboot from ram for x86 board

[LanceZ <Lance.Zhang@taihootech.com>]

Hi there,

I am trying to add some codes(driver) to u boot, but I do not have jtag or
other debugging tools. what I can use are :serial port/ethernet, so I can
use tftp and loadb to download the bin to ram.

Currently, I tried to use "loadb" to load the sample(hello_world) to ram and
then execute it, I always failed .here are the output for my testing.

I rename hello_world to rt61test
then rebuild all uboot
use nm command get follows:

00040000 T rt61test
00040098 T dummy

then start my board
In:    serial
Out:   serial
Err:   serial
Net:   i82559#0
boot > loadb 0x40000
## Ready for binary (kermit) download to 0x00040000 at 115200 bps...
## Start Addr      = 0x00040000
boot > go 40000
## Starting application at 0x00040000 ...
Invalid Instruction at 0000:00000000

I also tried other address for loadb(loadb 0x1000000)

I got the same error result

 Appreciate anyone can give me a direction or explain the error

Thanks
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