Rock2/Android/develop
Development
Please refer Rock/Android_Build#Initializing_a_Build_Environment to set up the building environment if you haven't set it already.
Android4.4
Get the source code
Download here radxa_rock2_square_android4.4.2_sdk.tar.xz
Build u-boot
cd u-boot make rk3288_defconfig make -j4
Build the kernel
cd kernel make radxa_rock2_square_defconfig make radxa-rock2-square.img -j 16
Build android source code
source build/envsetup.sh lunch rk3288-eng make -j 8
Generate the image
./mkimage.sh ota
you will get boot.img recovery.img system.img under rockdev/Image, and update.img ( e.g. rock2_android_kitkat_15-03-23_141904.img)under rockdev
Android5.1
Get the source code
http://dl.radxa.com/rock2_square/source/radxa_rock2_square_rk3288_android51_151107.tgz
http://dl.radxa.com/rock2_square/source/radxa_rock2_square_rk3288_android51_141107.md5
Build u-boot
cd u-boot make rk3288_defconfig make -j8
Build the kernel
cd kernel make radxa_rock2_square_lollipop_defconfig make radxa-rock2-square-lollipop.img -j8
Build android source code
source build/envsetup.sh lunch rk3288_box-userdebug make -j 8
Generate the image
./mkimage.sh ota