u-boot

u-boot map::
0x00000000 - 0x00040000 u-boot (256KB)
0x00040000 - 0x00050000 u-boot-env (64KB)
0x00050000 - 0x00650000 rootfs (6291456)
0x00650000 - 0x007E0000 uImage (1638400)
0x007E0000 - 0x007F0000 nvram (64KB)
0x007F0000 - 0x00800000 ART (64KB)

1. update kernel
tftp 0x81000000 kernel.lzma.uImage
era 0x9F650000 +0x190000
cp.b 0x81000000 0x9F650000 0x190000

2. update rootfs