ambarella from S2 sdk4.0 we make the it and get the "out" directory after we patch to the SDK. Complie Command: $ cd s2_linux_sdk/ambarella $ source build/env/Linaro-multilib-gcc4.8.env $ cd boards/s2ipcam $ make sync_build_mkcfg $ make s2_ipcam_8gb_s288_config ***************************** make menuconfig —————amba or make defconfig_public_linux —————firstly compile with the defconfig file. or make menuconfig_public_linux ————— kernel ***************************** $ make -j(n) ————— n : the number of the CPUs.