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PortingToAndroid9 » History » Version 219

Denis 'GNUtoo' Carikli, 09/12/2019 09:01 PM
move customrom i9300 status in other ports status

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h1. Porting Replicant to Android 9
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{{>toc}}
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h2. LineageOS 16
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h3. Repositories and changes for LineageOS 16
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* https://git.replicant.us/GNUtoo/kernel_replicant_linux.git
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* git://git.putti.eu/aosp/external_mesa3d.git
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* https://git.replicant.us/GNUtoo/android_build.git
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* https://git.replicant.us/GNUtoo/device_i9305.git
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* https://git.replicant.us/GNUtoo/manifest.git
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* https://git.replicant.us/GNUtoo/vendor_replicant.git
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h3. Building LineageOS 16 version
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h4. Source code
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<pre>
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$ repo init -u https://git.replicant.us/replicant-9/manifest.git -b replicant-9
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$ repo sync
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</pre>
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Alternatively a shallow copy of the source tree can be fetched in order to save on disk space:
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<pre>
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$ repo init -u https://git.replicant.us/replicant-9/manifest.git -b replicant-9 --depth=1
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$ repo sync -c
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</pre>
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To `unshallow` a specific module:
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<pre>
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$ cd path/to/module
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$ git fetch --unshallow <remote>
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</pre>
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h4. For Trisquel 8
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<pre>
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sudo apt-get install bc bison build-essential bsdmainutils ccache curl flex g++-multilib gcc-multilib gettext git gnupg gperf imagemagick lib32ncurses5-dev lib32readline-dev lib32z1-dev liblz4-tool libncurses5-dev libsdl1.2-dev libssl-dev libwxgtk3.0-dev libxml2 libxml2-utils lzop python-mako pngcrush rsync schedtool squashfs-tools xsltproc zip zlib1g-dev
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sudo apt-get install gcc-5-arm-linux-gnueabi
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</pre>
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h4. Launching the build
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Follow the "i9300 manifest instructions:":https://github.com/CustomRoms/android_local_manifests_i9300
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<pre>
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$ subject='/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'
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$ mkdir .android-certs
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$ for x in releasekey platform shared media testkey; do \
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  ./development/tools/make_key .android-certs/$x "$subject"; \
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  done
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$ parallel_tasks=$(echo "$(grep 'processor' /proc/cpuinfo | wc -l ) + 1" | bc)
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$ source build/envsetup.sh
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$ lunch lineage_i9305-eng
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$ make -j${parallel_tasks} bacon
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</pre>
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The images can then be flashed with heimdall. They are then in:
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<pre>
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  out/target/product/i9305/obj/PACKAGING/target_files_intermediates/lineage_i9305-target_files-eng.replicant/IMAGES/
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</pre>
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h4. Getting lastest changes
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* The repositories are being constantly modified with git push --force as we are trying things out, and don't want to make the commits history look too dirty, so be sure to backup your local changes.
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* Sometimes the manifest repository is also modified with git push --force. In that case the following commands will loose all the work you did locally but will make the repository consistent with upstream repositories again:
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<pre>
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$ rm -rf .repo/manifests/ # This enables me to force push and rebase the manifest repository as well
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$ repo init -u https://git.replicant.us/replicant-9/manifest.git -b replicant-9
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$ repo sync --force-sync
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</pre>
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* The following command might also be necessary to make the state consistent with upstream repositories again, when the manifest history wasn't rewritten, but it will also loose all the work you did locally: 
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<pre>
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$ repo sync --force-sync
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</pre>
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h4. Install the images
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<pre>
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$ sudo heimdall flash --BOOT out/target/product/i9305/obj/PACKAGING/target_files_intermediates/lineage_i9305-target_files-eng.replicant/IMAGES/boot.img --USERDATA out/target/product/i9305/obj/PACKAGING/target_files_intermediates/lineage_i9305-target_files-eng.replicant/IMAGES/userdata.img --SYSTEM out/target/product/i9305/obj/PACKAGING/target_files_intermediates/lineage_i9305-target_files-eng.replicant/IMAGES/system.img 
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</pre>
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h4. Get adb
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As the device IDs are the ones given by the Linux kernel, they are not in the adb udev rules, so for now it requires to run adb as root:
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<pre>
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$ sudo adb shell
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* daemon not running; starting now at tcp:5037
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* daemon started successfully
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i9305:/ #                                 
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$ sudo adb kill-server
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$ adb shell
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* daemon not running; starting now at tcp:5037
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* daemon started successfully
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error: no devices/emulators found
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</pre>
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So make sure to kill the adb-server and run it as root:
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<pre>
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$ adb kill-server
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$ sudo adb shell
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* daemon not running; starting now at tcp:5037
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* daemon started successfully
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i9305:/ # 
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</pre>
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h4. Booting
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At some point during boot, the device goes into suspend, so you will need to press some buttons like the power or volume button to make the boot continue until the graphical interface.
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You can also follow the boot progress with adb:
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<pre>
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adb logcat
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adb logcat -b main
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</pre>
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Note that the device can go into suspend at any time, so adb might be interrupted. That looks like that:
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First you get a shell
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<pre>
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$ sudo adb shell
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i9305:/ #
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</pre>
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Then the connection is interrupted:
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<pre>
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$ adb shell
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i9305:/ # [randomdev@fullyfreelaptop ]$                                                                                                     
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</pre>
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The effect with adb logcat is similar.
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h3. cleanups to be done
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* Make adb work as user by using the right USB IDs, and make userspace do the USB setup.
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* -Make the kernel not use hardcoded CMDLINE_FORCE- Not possible unless the bootloader is changed or Linux is very heavily patched.
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* Make the kernel not use hardcoded partitions if possible (though we use system as root)
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* Make a clean Gatekeeper HAL module implementation instead of using the same hack than goldfish
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* look at "init.rc":https://android.googlesource.com/platform/system/core/+/master/init/README.md documentation to see if init.rc can be overriden clearly with the override statement to see if it's possible to keep the serial console patch for -eng
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h3. Using SwiftShader instead of Mesa3D llvmpipe for software rendering
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To use SwifShader you need a kernel that supports UDIV/SDIV emulation, you can checkout the branch GNUtoo/udiv-emulation for kernel/replicant/linux. After doing that that run the following commands to use SwiftShader:
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<pre>
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$ adb remount
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$ adb shell
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i9305:/ # rm vendor/lib/egl/libGLES_mesa.so # or move it somewhere safe meanwhile you test SwiftShader
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i9305:/ # nano system/build.prop # set ro.hardware.hwcomposer=ranchu and ro.hardware.gralloc=default
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$ adb reboot
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</pre>
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h2. AOSP 9
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h3. Status with AOSP 9
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* The Galaxy SIII 4G (i9305) boots (with graphics hacks) under AOSP9, without having to import nonfree libraries:
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** The device boots until the lock screen
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** The graphics work but are really slow as they have not been optimized
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** Sometime the display content is corrupted
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** The touchscreen works
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* The kernel used is based on Linux 5.0-rc6 and has ~150 Android specific patches on top and some patches for the Galaxy SIII 4G (i9305) on top
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h3.  Repositories and changes
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* git://git.putti.eu/aosp/manifest_i9305.git
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* git://git.putti.eu/aosp/kernel_i9305.git
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* git://git.putti.eu/aosp/device_i9305.git
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* git://git.putti.eu/aosp/external_mesa3d.git
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* git://git.putti.eu/aosp/build_make.git
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* git://git.putti.eu/aosp/core.git
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h3. Building AOSP version
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h4. Source code
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First get the source code:
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<pre>
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$ repo init -u git://git.putti.eu/aosp/manifest_i9305.git -b android-9.0.0
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</pre>
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h4. For Trisquel 8
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<pre>
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sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z-dev libgl1-mesa-dev libxml2-utils xsltproc unzip bc python-mako gcc-5-arm-linux-gnueabi
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</pre>
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h4. Building it
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Once this is done, see the device/putti/i9305/README.md for the build instructions.
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h4. Trisquel 8 LXC
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If you use Parabola, you may be interested in running Trisquel 8 in LXC.
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To do that first debootstrap a Trisquel 8 rootfs. 
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Parabola's debootstrap does support Trisquel 8 and its manual has an example on how to do that:
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<pre>
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$ man debootstrap
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[...]
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# debootstrap flidas flidas-root http://archive.trisquel.info/trisquel
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</pre>
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Then you can use virt-manager to setup the LXC instance.
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The advantages of this solution are that:
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* The LXC guest and host shares their resources (CPU, RAM) with almost no penalty
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* Trisquel 8 is not a rolling release distribution
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The disadvantage of this solution are that:
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* you need to configure again the Trisquel 8 LXC instance (vimrc, sshd_config, etc)
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* It's more complicated to setup
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* The Android build system output a warning message about not being able to use namespaces which may become mandatory in newer Android versions
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h2. Upstreaming status
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* "Unbreak 5.2 booting:":https://www.openwall.com/lists/kernel-hardening/2019/06/14/4 This is really tricky as to work with the stock bootloader we'd have to disable the caches and the MMU. We need to look if upstream u-boot would accept something like that. Else we'd need to maintain a stub it.
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* -"add flash support to galaxy-s3 boards":https://lists.infradead.org/pipermail/linux-arm-kernel/2019-June/660361.html- "applied":https://lists.infradead.org/pipermail/linux-arm-kernel/2019-June/661471.html
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* We need to upstream the patch for battery charging
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* We also need to upstream the touchkey patch.
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h2. TODO
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First month of full time equivalent work:
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|_. Time estimation  |_.Task |_. Comments |
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| DONE | -boot a device under AOSP9- | Only boots with graphics, not much more |
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| -7h- DONE | -build it under a "FSDG compliant distribution":https://www.gnu.org/distros/free-distros.html like Trisquel8- | -WIP for AOSP, It's difficult to do precise time estimations as it could work out of the box or require one full time month of work depending on how much issues are encountered- 
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Builds under Trisquel8|
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| -21h- DONE | * -port the changes from AOSP9 to LineageOS 16-
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* -cleanup the code-
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* -build the kernel from the Android build system-
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* -make sure it builds with an FSDG compliant distribution-
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* -document the build procedure- |
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Status:
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* Boots with adb.
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* Has ultra slow graphics |
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| 14h | find, remove and document proprietary software in LineageOS 16 | |
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| 21h | find, remove and document privacy issues in LineageOS 16 | |
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| 7h | port the touch keys Linux -driver- dts for the  galaxy-s3 boards | Also requires a n710x for testing the patch |
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| 7h | -upstream the AAT1290 flash led Linux dts for the galaxy-s3 boards- | "applied upstream":https://lists.infradead.org/pipermail/linux-arm-kernel/2019-June/661471.html |
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| 7h | rebrand LineageOS as Replicant | |
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| 70h | -port and- cleanup the the Galaxy SIII (i9300) "modem":https://github.com/fourkbomb/linux/tree/modem Linux driver from 4.16 to 5.0| * The porting is done
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* The code still needs to be cleaned up
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* The code has not been validated completely yet, see below on the section with libsamung-ipc |
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|_\3. Total: 147h (~1 month) |
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Second month of full time equivalent work:
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| * port  libsamsung-ril and libsamsung-ipc to Android 9
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* Make the modem driver and libsamsung-ipc work together | 157h | -libsamsung-ipc should be trivial, libsamsung-ril probably needs to be heavily adapted to Trebble or the new RIL interfaces-
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-libsamsung-ipc and samsung-ril were fixed to compile on Android 9.-
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-The code was not yet tested at runtime.-
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-It also probably still need to be adapted to trebble or the new RIL interfaces to be more substainable.-
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Status:
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* The code has been updated to work without a wrapper on Android 9, but some cleanups are needed in all the modem related components.
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* The modem initialization is now complete. It has been validated with ipc-test of libsamsung-ipc under GNU/Linux.
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* TODO:
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** Validate that it can send-receive IPC messages
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** Test and/or fix libsamsung-ril with Replicant 9
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See #1954 for more details on the progress |
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|_. Total |_. 157h | ~1 month |
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Third month of full time equivalent work:
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|_. Task |_. Time estimation |_. Comments |
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| -port the sensors libraries and other device specific libraries-
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Look which sensor libraries can be used | 70h | Already done by the unofficial LineageOS port of the Galaxy SIII (i9300), needs testing |
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| add support for Audio with the upstream kernel driver | 70h | Might be way faster, depending on what Android 9 uses |
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| -add partial (no modem) support for the Galaxy SIII 4G (i9305) and- factorize the code with i9300 | 14h | * The source code on which the work was based changed from AOSP to an unofficial LineageOS port to a port of i9305 support for AOSP by Joonas to the official LineageOS so it's now supported by default
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* The work to factorize the code between the i9300 and i9305 still need to be done |
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 |
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|_. Total |_. 154h | ~1 month |
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|_. Task |_. Time estimation |_. Comments |
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| create a recovery | 21h | |
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| add internal WiFi support and validate the functionality | 6h | |
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| add external WiFi dongles support | 20h | External dongles support might be tricky |
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| -create new- update the install and upgrade instructions | -35h- | -Our current install instructions don't scale as we have one copy for each device.-
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-We also created generic instructions but they tend to be harder to follow[1] than the device specific ones.-
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-This will be made in a modular format (for instance in LaTeX) that enables to generate per device install instructions without requiring to have multiples copy of the same text.-
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-The instructions will need to be able to be modified and compiled on an FSDG compliant distribution.-
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Mostly done: 
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* The installation instructions are now generic enough. 
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* Some long standing TODO were also done along the way like adding backup instructions for the EFS.
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* The current instructions are still for Replicant 6.0 and will need to be updated for Replicant 9.0 |
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|_. Task |_. Time estimation |_. Comments |
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| Estimate the amount of work to Reduce the attack surface | ? | |
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| Estimate the amount of work to add in-system upgrades | ? | |
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fn1. The generic instructions were tested at Install parties in Paris 
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h3. Devices support:
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h4. Easy, because it's similar enough to the Galaxy SIII (I9300)
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|_\3. Galaxy Note II (N7100) |
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|_. Task |_. Time estimation |_. Comments |
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| port the EA8061 LCD Linux driver | 35h | |
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| port the S6EVR02 LCD Linux driver | 35h | |
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| port the MAX77693 flash led Linux driver | 7h | |
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| android: add support for the Note II (N7100) and factorize the code with Galaxy SIII (i9300) and Galaxy SIII 4G (i9305) | 14h | Should be similar to the Galaxy SIII |
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| port the sensors libraries and other device specific libraries | 70h | It's difficult to evaluate how much time it could take |
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| add support for Audio with the upstream kernel driver | 14h | Should be similar to the Galaxy SIII |
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|_\3. Galaxy Note 8.0 (N5100) and 8.0 WiFi (N5110) |
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|_. Task |_. Time estimation |_. Comments |
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| Evaluate the time required to do the port | 14h | TODO |
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h4. Needs more work and unknown upstream Linux status
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|_. Device |_. Time estimation |_. Comments |
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| Galaxy S II (i9100) | | Linux: devboard dts upstream? unknown status |
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| Galaxy Note (N7000) | | unknown Linux upstream status |
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| Galaxy Nexus (I9250) | |/2. OMAP4, no dts upsrteam |
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| Galaxy Tab 2 7.0 (P3100), 7.0 WiFi (P3110), 10.1 (P5100), 10.1 WiFi (P5110) | |
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| GTA04 >= A4 | | TODO: a RIL needs to be written, userspace GPS support is missing, audio scenarios, etc |
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h2. Documentation
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h3. Replicant 6.0 changes
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|_. Repository path |_. rebase worked |_. Changes |_. pushed rebase in Replicant 6.0 | Tag for the old history | 
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| build | No | | |
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| manifest | No | N/A |
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| bootable/recovery | Yes | * UI changes to improve usability
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* Branding
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* Small fix(es) | |
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| external/boringssl | Yes | * Small fix(es) |
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| external/heimdall | No | | |
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| frameworks/av | Yes | * Software rendering fix(es) | Yes | replicant-6.0-aug-2018 |
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| frameworks/base | Yes | * WiFi fixe(s) for external dongles
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* Software rendering fix(es) 
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* Privacy fix(es) 
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* Security improvements 
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* Usability improvements | Yes | replicant-6.0-sept-2018 |
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| frameworks/native | No | |
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| hardware/broadcom/wlan | Yes | * Remove nonfree software | |
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| hardware/libhardware | Yes | * Software rendering fix(es) | Yes | replicant-6.0-0003 |
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| hardware/libhardware_legacy | Yes | * Don't depend on nonfree software | |
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| hardware/ti/omap4 | Yes | * Remove nonfree software 
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* Don't depend on nonfree software 
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* Small fix(es) | |
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| libcore | Yes | * Small fix(es) | |
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| packages/apps/Browser | Yes | * Privacy fix(es) 
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* Branding
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* Small fix(es) | |
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| packages/apps/LegacyCamera | Yes | * Software rendering fix(es)
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* Small fix(es) | |
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| packages/apps/RepWifi | Not upstreamed, obsolete | N/A | |
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| packages/apps/ReplicantWallpapers | Not upstreamed | * Branding | |
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| packages/apps/Settings | No | | |
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| packages/apps/SetupWizard | Yes | * Privacy fix(es) 
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* Don't depend on nonfree software
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* Branding | |
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| packages/apps/ThemeChooser | Yes | * Privacy fix(es) ?
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* Don't depend on nonfree software ? | |
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| packages/providers/ContactsProvider | Yes | * Small fix(es) | |
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| system/core | Yes | * Branding
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* various fixes | |
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| vendor/replicant | No | |
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| vendor/cmsdk | Yes | * Branding | |
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| external/chromium-webview | ? | ? | |
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| external/drm_gralloc | Yes | * Software rendering fix(es) | Yes | replicant-6.0-aug-2018 |
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| external/llvm | Yes | * Software rendering fix(es) | Already rebased| replicant-6.0-0003 |
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| external/mesa3d |  Yes | * Software rendering fix(es)
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* Performance debugging for software rendering |
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| external/parameter-framework | Yes | * Small fix(es) | |
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| external/protobuf | N/A | No changes | |
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| prebuilts/ndk | ? | ? | |
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| prebuilts/sdk | ? | ? | |
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| sdk | Yes | * Small fix(es) | |
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| toolchain/src/binutils | Yes | * Small fix(es) | |
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| toolchain/src/gcc | No | | |
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| toolchain/src/jack | Yes | * Small fix(es) | |
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| toolchain/src/jill | Yes | * Small fix(es) | |
378 33 Denis 'GNUtoo' Carikli
| kernel/samsung/smdk4412 |/3. Yes |/3. * Security fixes
379 22 Denis 'GNUtoo' Carikli
* Privacy Fixes (TrustZone)
380
* Don't depend on nonfree software
381 28 Denis 'GNUtoo' Carikli
* Remove nonfree software
382 192 Denis 'GNUtoo' Carikli
* Small fix(es) | Yes | replicant-6.0-0003 |
383 191 Denis 'GNUtoo' Carikli
| kernel/samsung/tuna | Yes | replicant-6.0-0003 |
384 174 Denis 'GNUtoo' Carikli
| kernel/samsung/espresso10 | |
385 29 Denis 'GNUtoo' Carikli
| device/samsung/i9100 | No |/14. * Replace nonfree software by free software
386
* free software sensors implementation(s)
387
* free software modem audio implementation(s)
388 1 Denis 'GNUtoo' Carikli
* Software rendering fix(es)
389 33 Denis 'GNUtoo' Carikli
* Privacy Fixes (TrustZone)
390 1 Denis 'GNUtoo' Carikli
* Don't depend on nonfree software
391
* Remove nonfree software
392
* Branding
393 174 Denis 'GNUtoo' Carikli
* Small fix(es) | |
394
| device/samsung/n7000 | Yes | |
395
| device/samsung/i9300 | No | |
396
| device/samsung/i9305 | No | |
397 189 Denis 'GNUtoo' Carikli
| device/samsung/n7100 | Yes |  Already rebased| replicant-6.0-0003 |
398 174 Denis 'GNUtoo' Carikli
| device/samsung/n5100 | Yes | |
399
| device/samsung/n5110 | Yes | |
400
| device/samsung/maguro | Yes | |
401 191 Denis 'GNUtoo' Carikli
| device/samsung/tuna | Yes |
402 174 Denis 'GNUtoo' Carikli
| device/samsung/espressowifi | Yes | |
403
| device/samsung/espresso3g | Yes | |
404
| device/samsung/galaxys2-common | Yes | |
405
| device/samsung/smdk4412-common | No | |
406
| device/samsung/kona-common | Yes | |
407 186 Denis 'GNUtoo' Carikli
| hardware/ril/samsung-ril |\4. Not upstreamed |
408
| external/libsamsung-ipc |\4. Not upstreamed |
409
| hardware/tinyalsa-audio |\4. Not upstreamed? |
410 128 Denis 'GNUtoo' Carikli
411 193 Denis 'GNUtoo' Carikli
h3. Other rebases
412
413
TODO: move this in its own wiki page.
414
415
|_. Repository path |_. date | Tag for the old history  |_. Changes | Rationale |
416
| hardware/ril/samsung-ril | 24 July 2019 | replicant-6.0-0003 | Pointed replicant-6.0 to master | * See the "libsamsung-ril/libsamsung-ipc: delete or sync master branch? Was: [PATCH 6/6] Fix undefined references to MD5_{Init, Update, Final}  ":https://lists.osuosl.org/pipermail/replicant/2019-June/001950.html thread 
417
* This also has been made to prevent similar mistakes from hapening again |
418 194 Denis 'GNUtoo' Carikli
| external/libsamsung-ipc | 24 July 2019 | replicant-6.0-0003 | Pointed replicant-6.0 to master | * See the "libsamsung-ril/libsamsung-ipc: delete or sync master branch? Was: [PATCH 6/6] Fix undefined references to MD5_{Init, Update, Final}  ":https://lists.osuosl.org/pipermail/replicant/2019-June/001950.html thread 
419
* This also has been made to prevent similar mistakes from hapening again |
420 193 Denis 'GNUtoo' Carikli
421 217 Denis 'GNUtoo' Carikli
h2. Other attempts
422
423 218 Denis 'GNUtoo' Carikli
* It might be interesting to contact the people doing ports once we have something working well enough.
424
* It is also interesting to look at other attempts to understand if a given device is powerful enough to run Android 9 and what configuration was used to achieve it.
425
426 217 Denis 'GNUtoo' Carikli
|_. Device(s) |_. Repository |_. status |_. Comments |
427 219 Denis 'GNUtoo' Carikli
| i9300 | "CustomROMs":https://github.com/CustomROMs/android_local_manifests_i9300 | * "March 3 2019 release":https://forum.xda-developers.com/galaxy-s3/development/rom-lineageos-16-0-t3875899
428
* "July 12, 2019 Go port":https://forum.xda-developers.com/galaxy-s3/development/rom-optimized-lineageos-16-0-team-t3940142 | Issues:
429 217 Denis 'GNUtoo' Carikli
* Use a Samsung kernel
430
* Use too many nonfree libraries
431
=> Probably nothing we could reuse from its code |
432 218 Denis 'GNUtoo' Carikli
| I9100 | | "XDA":https://forum.xda-developers.com/galaxy-s2/development-derivatives/pie-i9100-t3850588 | |
433 217 Denis 'GNUtoo' Carikli
434 128 Denis 'GNUtoo' Carikli
h3. CustomROMs i9300 components
435
436 131 Denis 'GNUtoo' Carikli
|_. Repository |_. Tree path |_. Dependencies |_. Function |_. Comments |
437
|/8. https://github.com/CustomROMs/android_hardware_samsung
438
lineage-16.0 branch | hardware/samsung/macloader | | Loads the MAC Address of the WiFi network interface | Might be useful |
439
| hardware/samsung/wifiloader | | Loads the wifi kernel module (like modprobe) and setup firmware filesystems permissions | May be useful |
440
| hardware/samsung/audio | | seems to contains ril related stuff as well | Look if the ril stuff is required, go for standard audio |
441
| hardware/samsung/lineagehw/hidl/livedisplay | | livedisplay is a feature similar to what redshift does on GNU/Linux | Not sure if it works with mainline |
442
| hardware/samsung/exynos/multimedia/utils/ | seem meant for audio/video decoding offload | assembly obtimized color conversion and resize code | check assembly code license, not sure if useful |
443
| all other directories in hardware/samsung/exynos/ | nonfree firmwares, nonfree software?, smdk kernel? | audio/video decoding offload | Avoid using that |
444
| hardware/samsung/exynos3 |/2. nonfree firmwares?, nonfree software?, smdk kernel? |/2. some light libraries, display stuff (gralloc, etc), 2D acceleration (FIMG), camera (FIMC), 3D acceleration, etc |/2. Avoid using that for now |
445 202 Kurtis Hanna
| hardware/samsung/exynos4 |
446 1 Denis 'GNUtoo' Carikli
447
h2. Links 
448 205 dl lud
449
* "Android build requirements - hardware and software":https://source.android.com/setup/build/requirements
450
* "Why LineageOS Developers are building Android Go-optimized custom ROMs":https://www.xda-developers.com/android-go-old-android-8-1-oreo/
451
* "Android Go recommended default values for propreties for optimization":https://android.googlesource.com/platform/build/+/master/target/product/go_defaults_common.mk
452
* "Team InFusion i9300 optimized system.prop":https://github.com/team-infusion-developers/android_device_samsung_i9300/blob/lineage-16.0/system.prop#L23
453
* "Hack to fix high CPU usage caused by logd":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/c66015514fc9779edfed2665f67e841f3620c71e
454
* "Use low-end video codecs":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/adc919f04b981a4fe005fab2cf443596a22992b2
455
* "Optimize ActivityManager cached apps":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/24bc62970d35eb5a7a257463e7dbfe873ceb5779
456
* "Use 1Gb Dalvik config":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/8a7cebc5af772a2949420ac4a383f5f75236c65c