sun7i# ext2load mmc 0:1 0x46000000 uImage
1589664 bytes read in 106 ms (14.3 MiB/s)
sun7i# ext2load mmc 0:1 0x49000000 cubietruck.dtb
8181 bytes read in 6 ms (1.3 MiB/s)
sun7i# setenv bootargs console=ttyS0,115200 loglevel=7 root=/dev/mmcblk0p2 rootwait panic=10 rootfstype=ext4 rootflags=discard
sun7i# saveenv
Saving Environment to MMC...
Writing to MMC(0)... done
sun7i# bootm 0x46000000 - 0x49000000
## Booting kernel from Legacy Image at 46000000 ...
   Image Name:   Linux-3.12.0-rc1-87451-g2efb1f5
   Created:      2013-10-16  13:13:55 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1589600 Bytes = 1.5 MiB
   Load Address: 40008000
   Entry Point:  40008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 49000000
   Booting using the fdt blob at 0x49000000
   Loading Kernel Image ... OK
   Using Device Tree in place at 49000000, end 49004ff4

Starting kernel ...