uboot + uImage for cubox

My u-boot.img:

file u-boot.img
u-boot.img: u-boot legacy uImage, U-Boot 2013.10-rc4-gf82bf09-dirt\023, Firmware/ARM, Firmware Image (Not compressed), 231388 bytes, Sun Jun  8 00:31:02 2014, Load Address: 0x10800000, Entry Point: 0x00000000, Header CRC: 0x699EB6A4, Data CRC: 0x62D0FC4A

and the linux kernel's uImage:

From the ===>#make imx_v7_cubox-i_hummingboard_defconfig configuration make,

export LOADADDR=0x10800000
make uImage

file arch/arm/boot/uImage
arch/arm/boot/uImage: u-boot legacy uImage, Linux-3.10.30-g860304a, Linux/ARM, OS Kernel Image (Not compressed), 4900544 bytes, Mon Jun  9 00:45:53 2014, Load Address: 0x10800000, Entry Point: 0x10800000, Header CRC: 0x50D19541, Data CRC: 0x97D5D7EF

cat boot.txt

setenv bootargs 'console=ttymxc0,115200 video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32'
fatload mmc 0:1 0x10800000 uImage
bootm 0x10800000


mkimage -A arm -O linux -T script -C none -n "U-Boot commands" -d boot.txt boot.scr