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nand map
1: u-boot 2: 3: u-boot map:: 4: 0x00000000 - 0x00040000 u-boot (256KB) 5: 0x00040000 - 0x00050000 u-boot-env (64KB) 6: 0x00050000 - 0x00650000 rootfs (6291456) 7: 0x00650000 - 0x007E0000 uImage (1638400) 8: 0x007E0000 - 0x007F0000 nvram (64KB) 9: 0x007F0000 - 0x00800000 ART (64KB) 10: 11: 1. update kernel 12: tftp 0x81000000 kernel.lzma.uImage 13: era 0x9F650000 +0x190000 14: cp.b 0x81000000 0x9F650000 0x190000 15: 16: 2. update rootfs