nand problem on mini2440

[Yi Qingliang]

Hi, All!

I'm using mini2440 and barebox.

I have flashed barebox using jtag, and can boot coreectly.

then enter barebox shell, use command
tftp zImage.bin /dev/nand0.kernel.bb
to flash kernel, but no success.

I can see the progress bar, and exit correctly.
but the flash still hold the old kernel, (use 'bootz /dev/nand0.kernel.bb' can 
boot the kernel).

any idea? thanks!

Yi Qingliang
Nanjing Jilong