Compiling Android 7.1 Preparation Hardware Requiremnts Recommended hardware requirement of development workstation compiling Android 7.1: 64 bit CPU 16GB Physical memory + Swap memory 30GB Free disk space is used for building, and the source tree takes about 8GB See also the hardware and software configuration stated in Google official document: https://source.android.com/setup/build/requirements https://source.android.com/setup/initializing Software Requiements Installing JDK 8 sudo add-apt-repository ppa:openjdk-r/ppa sudo apt-get update sudo apt-get install openjdk-8-jdk Installing required packages sudo apt-get install git-core gnupg flex bison gperf libsdl1.2-dev \ libesd0-dev libwxgtk2.8-dev squashfs-tools build-essential zip curl \ libncurses5-dev zlib1g-dev pngcrush schedtool libxml2 libxml2-utils \ xsltproc lzop libc6-dev schedtool g++-multilib lib32z1-dev lib32ncurses5-dev \ lib32readline-gplv2-dev gcc-multilib libswitch-perl sudo apt-get install gcc-arm-linux-gnueabihf \ libssl1.0.0 libssl-dev \ p7zip-full Downloading Android SDK Due to the huge size of the Android SDK, please download SDK"firefly_rk3328_android7.1_git_20211216": Download After the download completes, verify the MD5 checksum before extraction: $md5sum ~/firefly_rk3328_android7.1_git_20211216.7z.001 $md5sum ~/firefly_rk3328_android7.1_git_20211216.7z.002 $md5sum ~/firefly_rk3328_android7.1_git_20211216.7z.003 f4d62bfbb401f596328435e61cb1c68d firefly_rk3328_android7.1_git_20211216.7z.001 0bb35911c8740119f789926d6d21c550 firefly_rk3328_android7.1_git_20211216.7z.002 19eebf52e1e033cea682cdd306d8f75a firefly_rk3328_android7.1_git_20211216.7z.003 Then extract it: mkdir -p ~/proj/firefly_rk3328_android7.1 cd ~/proj/firefly_rk3328_android7.1 7z x ~/firefly_rk3328_android7.1_git_20211216.7z.001 -r -o. git reset --hard Synchronize source code from gitlab: git pull gitlab roc-rk3328-cc:roc-rk3328-cc git checkout roc-rk3328-cc Compiling with Firefly Scripts Compiling Kernel ./FFTools/make.sh -k -j8 Compiling U-Boot ./FFTools/make.sh -u -j8 Compiling Android ./FFTools/make.sh -a -j8 Compiling Everying This will compile kernel, U-Boot and Android with a single command: ./FFTools/make.sh -j8 Compiling Without Script Before compilation, execute the following commands to configure environment variables: export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar Compiling Kernel make ARCH=arm64 firefly_defconfig make -j8 ARCH=arm64 rk3328-roc-cc.img Compiling U-Boot make rk3328_box_defconfig make ARCHV=aarch64 -j8 Compiling Android source build/envsetup.sh lunch roc_rk3328_cc_box-userdebug make installclean make -j8 ./mkimage.sh Packing Rockchp Firmware Packing Fimware in Linux After compiling you can use Firefly official script to pack all partition image files into the one true Rockchip firmware or the one true original firmware, by executing the following command: rk firmware: ./FFTools/mkupdate/mkupdate.sh update original firmware: ./FFTools/mkupdate/sd_mkupdate.sh update The resulting file is "rockdev/Image-rk3328_firefly_box/update.img". The RK firmware needs to use the "SD_Firmware_Tool" tool and the function mode to select "SD Startup" to create the boot card, and original firmware can use the "SDCard-installer" to make the boot card. Packing Fimware in Windows It is also very simple in packaging Rockchip firmware "update.img" under Windows: Copy all the compiled files in rockdev/Image-rk3328_firefly_box/ to the rockdev\Image directory of AndroidTool Run the mkupdate.bat batch file in the rockdev directory of AndroidTool. update.img will be created in rockdev\Image directory. Partition Images "update.img" is the firmware released to end users, which is convenient to upgrade the system of the deveopment board. During development cycle, it is a great time saving to only flash modified partition images. Here's a table summarising the partition image in various stage: |------------------|---------------------|-----------| | Stage | Product | Partition | |------------------|---------------------|-----------| | Compiling Kernel | kernel/kernel.img | kernel | | | kernel/resource.img | resource | |------------------|---------------------|-----------| | Compiling U-Boot | u-boot/uboot.img | uboot | |------------------|---------------------|-----------| | ./mkimage.sh | boot.img | boot | | | system.img | system | |------------------|---------------------|-----------| Note that by excuting "./mkimage.sh", "boot.img" and "system.img" will be repacked wth the compiled results of Android in "out/target/product/rk3328_firefly_box/" directory, and all related image files will be copied to the directory "rockdev/Image- rk3328_firefly_box/". The following is a list of the image files: boot.img: Android initramfs image, contains base filesystem of Android root directory, whcih is responsible for initializing and loading the system partition. system.img: Android system partition image in ext4 filesystem format. kernel.img: kernel image. resource.img: Resource image, containing boot logo and kernel device tree blob. misc.img: misc partition image, responsible for starting the mode switch and first aid mode parameter transfer. recovery.img: Recovery mode image. rk3328_loader_v1.08.244.bin: Loader files. uboot.img: U-Boot image file. trust.img: Arm trusted file (ATF) image file. parameter.txt: Partition layout and kernel command line.