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:

1. 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
2. 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>

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   <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>

3. 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

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   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

4. 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

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   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

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   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:

Thanks to Ovidiu for the info.

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