Compile the Android5.1 firmware

Download the Android SDK

The source code package of the Android SDK is large (approximately
6.3G), and the source code package can be obtained by:

[Download Link]

verify the MD5 code when the download is complete:

   $md5sum ~/firefly_rk3288_rk3128_android5.1_git_20211216.7z.001
   $md5sum ~/firefly_rk3288_rk3128_android5.1_git_20211216.7z.002

   3d7a59a84e059cd55a68304d47a5462b  firefly_rk3288_rk3128_android5.1_git_20211216.7z.001
   1979bd263b51bec27ec10eceb500731b  firefly_rk3288_rk3128_android5.1_git_20211216.7z.002

Once confirmed, you will be able to extract:

   mkdir -p ~/proj/firefly_rk3288_android5.1
   cd ~/proj/firefly_rk3288_android5.1
   7z x ~/firefly_rk3288_rk3128_android5.1_git_20211216.7z.001 -r -o.
   git reset --hard

You can update directly from "gitlab" in the future

   git pull gitlab Firefly-RK3288:Firefly-RK3288

Complie

Overall Compilation

Public Compile

HDMI

   ./FFTools/make.sh -d firefly-rk3288-aio-3288c -j8 -l rk3288_aio_3288c_box-userdebug
   ./FFTools/mkupdate/mkupdate.sh -l rk3288_aio_3288c_box-userdebug

Display DM-M10R800 Compile

LVDS+HDMI

   ./FFTools/make.sh -d firefly-rk3288-aio-3288c_lvds -j8 -l rk3288_aio_3288c_box-userdebug
   ./FFTools/mkupdate/mkupdate.sh -l rk3288_aio_3288c_box-userdebug

Compile step by step

Compile uboot

   cd ~/proj/firefly_rk3288_android5.1/u-boot
   make rk3288_defconfig
   make -j8

Compile kernel

   cd ~/proj/firefly_rk3288_android5.1/kernel
   make firefly_defconfig
   make -j8 firefly-rk3288-aio-3288c.img

Compile Android

   cd ~/proj/firefly_rk3288_android5.1/
   source build.sh
   lunch rk3288_aio_3288c_box-userdebug
   make -j8
   ./mkimage.sh

Build variation

The default target build variation (TARGET_BUILD_VARIANT) is
userdebug. There are three common variations, user, userdebug and eng,
their differences are:

user  Only install the modules whose label is user  Set the property
ro.secure=1, and turn on the security check function  Set the property
ro.debuggable=0, and turn off the application debugging function  Turn
off the adb function by default  Turn on the Proguard obfuscator  Turn
on the DEXPREOPT pre-compilation optimization

userdebug  Install the modules whose label is user or debug  Set the
property ro.secure=1, and turn on the security check function  Set the
property ro.debuggable=1, and turn on the application debugging
function  Turn on the ADB function by default  Turn on the Proguard
obfuscator  Turn on the DEXPREOPT pre-compilation optimization

eng  Install the modules whose label is user, debug or eng  Set the
property ro.secure=0, and turn off the security check function  Set
the property ro.debuggable=1, and turn on the application debugging
function  Set the property ro.kernel.android.checkjni=1, and enable
the JNI call checking  Turn on the adb function by default  Turn off
the Proguard obfuscator  Turn off the DEXPREOPT pre-compilation
optimization

If the target build variation is user, the adb cannot get the root
privileges.If you want to select a target build variation, you can add
the parameters at the make command line, for example:

   make -j8 PRODUCT-rk3288_aio_3288c_box-user
   make -j8 PRODUCT-rk3288_aio_3288c_box-userdebug
   make -j8 PRODUCT-rk3288_aio_3288c_box-eng

Flash the partition image

The "./mkimage.sh" from the previous step will repack the "boot.img"
and "system.img" and copy other related image files to the "rockdev
/Image-rk3288_aio_3288c_box/" directory. The following lists the image
files used by the general firmware:

boot.img ：the initial file image for Android is responsible for
initializing and loading the system partition.

kernel.img ：kernel image.

misc.img ：misc partition image is responsible for initiating the mode
switching and passing the parameter in the emergency mode.

recovery.img ：image in the emergency mode.

resource.img ：resource image, which contains the boot image and the
device tree blob information of the kernel.

system.img ：system partition image for Android, it is ext4 file
system format.

Please refer to

upgrade_firmware

 to flash the partition image file.If the Windows system is used, you
can copy the image file above to the "rockdev\Image" directory of the
AndroidTool (firmware upgrade tool under Windows), and then refer to
the upgrade document to flash the partition image, the benefit is to
use the default configuration without modifying the path of the file.

Pack into a unified firmware update.img

After compiling, you can use the script of Firefly to pack into the
unified firmware, the command is:

   ./FFTools/mkupdate/mkupdate.sh -l rk3288_aio_3288c_box-userdebug

The firmware is generated in the "rockdev/Image-rk3288_aio_3288c_box/"
directory after packing.

It is easy to pack the unified firmware update.img under Windows, you
can copy the file to the "rockdev\Image" directory of the AndroidTool
by following the previous steps, and then run the "mkupdate.bat" batch
file in the "rockdev" directory to create the "update.img" and save it
to the "rockdev\Image" directory.

The "update.img" is easy to release the firmware and is used for
upgrading the system by the end user. It is convenient to use a
partition image for general development.