u-boot

u-boot 8MB nand map::
0x00000000 - 0x00040000 u-boot (256KB == 262144) // +0x40000
0x00040000 - 0x00050000 u-boot-env (64KB == 65536) // +0x10000
0x00050000 - 0x00650000 rootfs (6144KB == 6291456) // +0x600000
0x00650000 - 0x007E0000 uImage (1600KB == 1638400) // +0x190000
0x007E0000 - 0x007F0000 cfg (64KB == 65536) // +0x10000
0x007F0000 - 0x00800000 ART (64KB == 65536) // +0x10000

u-boot environment::
mtdids=nor0=ar7240-nor0
mtddevnum=0
mtddevname=u-boot
mtdparts=mtdparts=ar7240-nor0:256k(u-boot),64k(u-boot-env),6m(rootfs),1600k(uImage),64k(cfg),64k(ART)

u-boot mtdparts::
device nor0 <ar7240-nor0>, # parts = 6
#: name			size		offset		mask_flags
0: u-boot              	0x00040000	0x00000000	0
1: u-boot-env          	0x00010000	0x00040000	0
2: rootfs              	0x00600000	0x00050000	0
3: uImage              	0x00190000	0x00650000	0
4: cfg                 	0x00010000	0x007e0000	0
5: ART                 	0x00010000	0x007f0000	0
active partition: nor0,0 - (u-boot) 0x00040000 @ 0x00000000


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