[U-Boot] is any bug in cp?

hi,in my uboot.

there is some bugs when I cp to flash like this: cp.b addr1 addr2 0x100

when the two addr in the same bank of a flash. it go wrongs

finally the date of addr2 is 0x8080808080...

cp to another bank of flash is work correctly. cp from mem to flash or from flash to mem also correctly.

how is this£¿