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Revision as of 07:32, 4 January 2019 by Rogier.oudshoorn (talk | contribs) (Android system image)
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Libhybris allows devices lacking FLOSS drivers to make full use of their hardware by using the proprietary drivers from Android. Mainlining and using free software drivers is of course the better approach, but it is not possible for all devices. We will not list devices that need hybris as featured devices (see postmarketos.org#83).

Using libhybris with your device

Android system image

First thing to do is convert the halium generated system.img to a mountable image (basically what the halium install script does) and the new system.img to the device, to /var/lib/lxc/android/system.img

The way to do attain this, is:

  • Port halium (https://docs.halium.org , https://halium.org) to your device. This may take a while.
  • Get it running to a point where you have at least graphics operational
  • It works if you run the same kernel source for both, and apply all defconfig changes needed for the halium port to your postmarketos port
  • Boot your halium-running device into android recovery, and download the /data/system.img file from it. This is the systemimage you've built for halium, with the modifications that the installation script has done.
  • Flash postmarketOS to your device
  • Upload the system.img file to /var/lib/lxc/android/system.img

Install the hybris related packages

$ sudo apk add lxc-android \
               xf86-video-hwcomposer \
               libhybris \
               libhybris-egl \
               libhybris-gles \
               libhybris-libwayland-egl \
               wayland-libs-client \

Depending if you need software which is built for Code Aurora Forum’s Android for MSM (generally nicknamed “CAF” for short):

$ sudo apk add libhybris-7.1-caf \

For all the other devices:

$ sudo apk add libhybris-7.1 \

Start the android container

$ sudo rc-service lxc-android start

Configure Xorg

You need to create the /etc/X11/xorg.conf.d/10-<device>.conf with the following:

Section "Device"
  Identifier "Card0"
  Driver "hwcomposer"

Test whether lxc-android works properly and kernel is correctly configured

1) Ensure you installed the packages above, started the lxc-android service and checked that it's running

2) Download the Halium reference rootfs from bshah’s personal server: http://bshah.in/halium/halium-rootfs-20170630-151006.tar.gz

3) Extract to a temporary folder

4) Bind some folders into the halium rootfs

$ mount --bind /dev /tmp/halium-rootfs/dev
$ mount --bind /sys /tmp/halium-rootfs/sys
$ mount --bind /proc /tmp/halium-rootfs/proc
$ mount --bind /system /tmp/halium-rootfs/system
$ ln -s /system/vendor /tmp/halium-rootfs/vendor

5) Chroot into halium

$ chroot /tmp/halium-rootfs /bin/bash

6) Update

$ echo "deb http://repo.halium.org/caf xenial main" >> /etc/apt/sources.list.d/halium-caf.list
$ apt-get update
$ apt-get dist-upgrade

7) Test

$ EGL_PLATFORM=hwcomposer test_hwcomposer

See also