u-boot

u-boot 8MB nand map::
0x00000000 - 0x00040000 u-boot (256KB) // +0x40000
0x00040000 - 0x00050000 u-boot-env (64KB) // +0x10000
0x00050000 - 0x00650000 rootfs (6291456) // +0x600000
0x00650000 - 0x007E0000 uImage (1638400) // +0x190000
0x007E0000 - 0x007F0000 NVRAM (64KB) // +0x10000
0x007F0000 - 0x00800000 ART (64KB) // +0x10000

Helper nand map for easy updates :)
* 0x00050000 - 0x007E0000 firmware (7929856) // +0x790000

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

2. update rootfs
tftp 0x80100000 rootfs.ulzma
era 0x9F050000 +0x600000
cp.b 0x80100000 0x9F050000 0x600000

3. update cfg
tftp 0x80100000 cfg.dsk
era 0x9f7E0000 +0x10000
cp.b 0x80100000 0x9f7e0000 0x10000