$ cat demo.sh
#!/bin/bash

#build uboot
if [ "$1" == 'u' ] || [ "$1" == 'n' ]; then	
	echo "build uboot"
	cd bootloader/uboot
if [ "$2" == 'n' ] || [ "$1" == 'n' ]; then
	make clean	
	echo "build uboot n"
fi	
	./mk kvim4 --avb2 --vab
	cd -
fi

#build kernel
if [ "$1" == 'k' ] || [ "$1" == 'n' ]; then
	echo "build kernel"
if [ "$2" == 'n' ] || [ "$1" == 'n' ]; then
	rm -rf common/common14-5.15/out
fi	
	./mk kvim4 -v common14-5.15 -j88
fi

#build android
if [ "$1" == 'a' ] || [ "$1" == 'n' ]; then
	echo "build android" 
if [ "$2" == 'n' ] || [ "$1" == 'n' ]; then
	rm -rf out/
fi
	. build/envsetup.sh 
 	lunch kvim4_arm64-userdebug
#	make installclean
	rm android.log
	make aml_upgrade -j88 >> android.log
fi

if [ "$1" == 'o' ] || [ "$1" == 'n' ]; then
	echo "build otapackage" 
	. build/envsetup.sh 
 	lunch kvim4_arm64-userdebug
	make -j88 otapackage
fi