Procedure to Flash NAND on Beagle Board Fail...

Hello to all,
I'm following this web page [1] but now, after this commands:
      OMAP3 # nand unlock
     OMAP3 # nand erase
the beagleboard reboot every time:

I'm trying different uboot files. From the AngStrom site for example
[1] but this not solve my problem.
The beagleboard is still booting forever after the "Audio Tone on
Speakers" output in console.

I have attached only the SDCard and the serial console cable on the
board. The power is from the external power connector.

Any idea?

Many Many thanks.