[U-Boot] copy to flash: Flash not Erased

[Howard Wang]

Hi,

I have some problems with using u-boot writing to flash:  ( arm 920  
processor )

first I  use tftp to download the kernel to memory and was successful:

 >tftp 0x800000 mImage
 > OK

then I try to erase part of the flash, seems ok:

 > erase 0x1c040000 0x1c8FFFFF 		
 > erased 124 sectors

then I use cp.b command, failed with the "Flash not Erased" message
cp.b ${fileaddr} 0x1c040000 ${filesize}
	
 >		copy to Flash...-Flash not Erased.

and no detailed error message was given.

any idea what could be wrong ?

Thanks for the help in advance.

Howard