#U-Boot Compilation for 2013 Kernel
Follow these instruction up untill 'git checkout 2015.10.fslc-qdl'
https://www.udoo.org/docs/Advanced_Topics/Compile_U-Boot_Bootloader.html
Then execute these instructions :
cp include/configs/udoo_qdl.h include/configs/udoo_qdl.h.orig
sed -i 's|fatload|ext4load|' include/configs/udoo_qdl.h
sed -i 's|bootz|bootm|' include/configs/udoo_qdl.h
cp arch/arm/imx-common/cpu.c arch/arm/imx-common/cpu.c.orig
cp cpu.c arch/arm/imx-common/cpu.c
cp tools/logos/udoo.bmp tools/logos/udoo.bmp.orig
cp ixor_logo.bmp tools/logos/udoo.bmp
continue with compilation and writing the bootloader to sdcard now..
Finally copy this file to the root of sdcard (filesystem with /boot on it) :
cp uEnv.txt /media/{username}/UDOObuntu