This is the way I flash a new kernel image:
Transfer uImage over serial port:
object$ loady ## Ready for binary (ymodem) download to 0x50C07FC0 at 115200 bps... C## Total Size = 0x00170000 = 1507328 Bytes
Erase Linux kernel flash partition:
object$ erase 0x10030000 0x1019FFFF
Copy downloaded image to flash:
object$ cp.b 0x50C07FC0 0x10030000 0x00170000