U-Boot SPL 2015.01 (Feb 08 2015 - 20:40:11)
DRAM: 2048 MiB
CPU: 960000000Hz, AXI/AHB/APB: 3/2/2


U-Boot 2015.01 (Feb 08 2015 - 20:40:11) Allwinner Technology

CPU:   Allwinner A20 (SUN7I)
I2C:   ready
DRAM:  2 GiB
NAND:  8192 MiB
MMC:   SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment

Reserved 8192kB of RAM for Framebuffer.
In:    serial
Out:   serial
Err:   serial
Net:   dwmac.1c50000
Unknown command 'usb' - try 'help'
Hit any key to stop autoboot:  0 
sun7i# printenv
baudrate=115200
boot_a_script=load ${devtype} ${devnum}:${bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_extlinux=sysboot ${devtype} ${devnum}:${bootpart} any ${scriptaddr} ${prefix}extlinux/extlinux.conf
boot_prefixes=/ /boot/
boot_scripts=boot.scr.uimg boot.scr
boot_targets=mmc0 pxe dhcp 
bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done
bootcmd_dhcp=if dhcp ${scriptaddr} boot.scr.uimg; then source ${scriptaddr}; fi
bootcmd_mmc0=setenv devnum 0; run mmc_boot
bootcmd_pxe=dhcp; if pxe get; then pxe boot; fi
bootdelay=2
bootm_size=0x10000000
bootpart=1
console=ttyS0,115200
ethact=dwmac.1c50000
ethaddr=02:83:08:c2:2e:2e
fdt_addr_r=0x43000000
fdtfile=sun7i-a20-cubietruck.dtb
kernel_addr_r=0x42000000
mmc_boot=if mmc dev ${devnum}; then setenv devtype mmc; run scan_dev_for_boot; fi
mtdparts=mtdparts=mtd-nand-sunxi.0:2m(boot0),2m(boot0-rescue),-(main)
nand0=mtd-nand-sunxi.0
preboot=usb start
pxefile_addr_r=0x43200000
ramdisk_addr_r=0x43300000
scan_dev_for_boot=echo Scanning ${devtype} ${devnum}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${bootpart} ${prefix}extlinux/extlinux.conf; then echo Found ${prefix}extlinux/extlinux.conf; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi
scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fe
scriptaddr=0x43100000
stderr=serial,vga
stdin=serial,usbkbd
stdout=serial,vga

Environment size: 1724/131068 bytes
sun7i# mtdparts 

device nand0 <mtd-nand-sunxi.0>, # parts = 3
 #: name                size            offset          mask_flags
 0: boot0               0x00200000      0x00000000      0
 1: boot0-rescue        0x00200000      0x00200000      0
 2: main                0x1ffc00000     0x00400000      0

active partition: nand0,0 - (boot0) 0x00200000 @ 0x00000000

defaults:
mtdids  : nand0=mtd-nand-sunxi.0
mtdparts: mtdparts=mtd-nand-sunxi.0:2m(boot0),2m(boot0-rescue),-(main)
sun7i#