3D Graphics Acceleration in Linux on Allwinner A80 based Cubieboard4

Allwinner A80 is a powerful octa-core processor found in development boards and TV boxes such as Cubieboard4 or Tronsmart Draco AW80. Some early Ubuntu images and instructions had already been released for A80 Optimusboard and Draco AW80, but none of these featured GPU drivers for 3D acceleration, which to be honest, has limited advantages in Linux desktop distributions since desktop environments and most apps require full OpenGL support, i.e. not only OpenGL ES, and the only ARM SoC that can provide OpenGL support without external graphics card is Nvidia Tegra K1 SoC. Having said that GPU drivers would pave the way for smooth OpenELEC / Kodi user interface support in Allwinner A80 Linux distributions. That’s only one part of the puzzle, since the GPU normally handles the user interface, while the VPU takes care of video decoding.

The good news is that CubieTech release updates images for their Cubieboard4 (CC-A80) development with PowerVR GC6200 GPU support, which you can download on Baidu:

linaro-cb4-emmc-vga-v0.3.img.7z is the eMMC flash image with VGA output
linaro-cb4-emmc-hdmi-v0.3.img.7z.md5 is the eMMC flash image with HDMI output

The company also provided instructions they followed to create the image, using two files they got from Allwinner rogue_km.tar.gz , and discimage-release-1.4-fix_buffer_ideas_20141216_no_gl.tar.gz, available on Cubieboard server.

The steps below have been completed in an Ubuntu 14.04 computer’s terminal window, and may need some corrections, since I’ve mostly edited them from an email but not tried myself:

Build drivers

tar -zxpf rogue_km.tar.gz cp -rf rogue_km linux-3.4/modules cd rogue_km/build/linux/sunxi_linux && make -j4

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tar -zxpf rogue_km.tar.gz
cp -rf rogue_km linux-3.4/modules
cd rogue_km/build/linux/sunxi_linux && make -j4

The two drivers files dc_drmfbdev.ko and pvrsrvkm.ko can be found in linux-3.4/modules/rogue_km/binary_sunxi_linux_xorg_release/target_armhf directory

Copy drivers to SD card
You’ll need to download and extract Linaro Ubuntu 14.04 rootfs, and copy the drivers to a bootable sdcard in the rootfs partition

<span lang="en-US">mkdir -p &lt;path_to_rootfs&gt;/lib/modules/3.4.3/extra
cp dc_drmfbdev.ko pvrsrvkm.ko &lt;path_to_rootfs&gt;/lib/modules/3.4.39/extra/
sync </span>

<span lang="en-US">mkdir -p <path_to_rootfs>/lib/modules/3.4.3/extra

cp dc_drmfbdev.ko pvrsrvkm.ko <path_to_rootfs>/lib/modules/3.4.39/extra/

sync </span>

Copy libraries to rootfs

sudo tar -zxpf discimage-release-1.4-fix_buffer_ideas_20141216_no_gl.tar.gz
cd &lt;path_to_rootfs&gt;/usr/local/pvr
cp -rf etc/ &lt;path_to_rootfs&gt;/
cp -rfd include share &lt;path_to_rootfs&gt;/usr
cp -rfd lib/xorg &lt;path_to_rootfs&gt;/usr/lib
cp -rfd lib/* &lt;path_to_rootfs&gt;/usr/lib/arm-linux-gnueabihf
cp -rf ssl &lt;path_to_rootfs&gt;/etc
cp -rf ssl/misc/ &lt;path_to_rootfs&gt;/usr/lib/ssl
cd discimage/usr/
cp -rfd lib/* &lt;path_to_rootfs&gt;/usr/lib/arm-linux-gnueabihf
cp -rf local/bin &lt;path_to_rootfs&gt;/usr/local
sync

sudo tar -zxpf discimage-release-1.4-fix_buffer_ideas_20141216_no_gl.tar.gz

cd <path_to_rootfs>/usr/local/pvr

cp -rf etc/ <path_to_rootfs>/

cp -rfd include share <path_to_rootfs>/usr

cp -rfd lib/xorg <path_to_rootfs>/usr/lib

cp -rfd lib/* <path_to_rootfs>/usr/lib/arm-linux-gnueabihf

cp -rf ssl <path_to_rootfs>/etc

cp -rf ssl/misc/ <path_to_rootfs>/usr/lib/ssl

cd discimage/usr/

cp -rfd lib/* <path_to_rootfs>/usr/lib/arm-linux-gnueabihf

cp -rf local/bin <path_to_rootfs>/usr/local

sync

Insert the SD card into Cubieboard4 board, boot, and complete the steps as follows:

mkdir -pv /usr/local/pvr/lib/dri/
 cd /usr/local/pvr/lib/dri/
ln -s /usr/lib/arm-linux-gnueabihf/dri/pvr_dri.so
ln -s /usr/lib/arm-linux-gnueabihcdf/dri/swrast_dri.so
rm /usr/lib/arm-linux-gnueabihf/mesa-egl -rf
cd /usr/lib/arm-linux-gnueabihf
ln -s libGLESv2.so.1.4.3064661 libGLESv2.so.2

mkdir -pv /usr/local/pvr/lib/dri/

cd /usr/local/pvr/lib/dri/

ln -s /usr/lib/arm-linux-gnueabihf/dri/pvr_dri.so

ln -s /usr/lib/arm-linux-gnueabihcdf/dri/swrast_dri.so

rm /usr/lib/arm-linux-gnueabihf/mesa-egl -rf

cd /usr/lib/arm-linux-gnueabihf

ln -s libGLESv2.so.1.4.3064661 libGLESv2.so.2

Edit /etc/modules to add the two lines:

dc_drmfbdev
pvrsrvkm

1 2	dc_drmfbdev pvrsrvkm

Insert the modules, run depmod, and reboot to complete the installation:

insmod /lib/modules/3.4.39/extra/dc_drmfbdev.ko
insmod /lib/modules/3.4.39/extra/
depmod
reboot

insmod /lib/modules/3.4.39/extra/dc_drmfbdev.ko

insmod /lib/modules/3.4.39/extra/

depmod

reboot

Done!

Now you can test 3D graphics acceleration works with glmark2-es2 or es2gears:

<span lang="en-US">sudo apt-get install glmark2-es2
sudo glmark2-es2 </span>

1 2	<span lang="en-US">sudo apt-get install glmark2-es2 sudo glmark2-es2 </span>

Thanks to Ovidiu for the info.

Jean-Luc Aufranc (CNXSoft)

Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.