u-boot just work while flash in NOR Flash, when power on it looks as blow:
u-boot 2010.06 (Aug 06 2014 - 20:59:49)

DRAM:  64 MiB
Flash: 512 KiB
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   CS8900-0
[u-boot@MINI2440] #