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Porting Replicant to Android 9 » History » Revision 132

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Denis 'GNUtoo' Carikli, 05/20/2019 11:44 PM


Porting Replicant to Android 9

AOSP 9

Status with AOSP 9

  • The Galaxy SIII 4G (i9305) boots (with graphics hacks) under AOSP9, without having to import nonfree libraries:
    • The device boots until the lock screen
    • The graphics work but are really slow as they have not been optimized
    • Sometime the display content is corrupted
    • The touchscreen works
  • 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

Repositories and changes

  • git://git.putti.eu/aosp/manifest_i9305.git
  • git://git.putti.eu/aosp/kernel_i9305.git
  • git://git.putti.eu/aosp/device_i9305.git
  • git://git.putti.eu/aosp/external_mesa3d.git
  • git://git.putti.eu/aosp/build_make.git
  • git://git.putti.eu/aosp/core.git

Building AOSP version

Source code

First get the source code:

$ repo init -u git://git.putti.eu/aosp/manifest_i9305.git -b android-9.0.0

For Trisquel8
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

Building it

Once this is done, see the device/putti/i9305/README.md for the build instructions.

Trisquel 8 LXC

If you use Parabola, you may be interested in running Trisquel 8 in LXC.

To do that first debootstrap a Trisquel 8 rootfs.

Parabola's debootstrap does support Trisquel 8 and its manual has an example on how to do that:

$ man debootstrap
[...]
# debootstrap flidas flidas-root http://archive.trisquel.info/trisquel

Then you can use virt-manager to setup the LXC instance.

The advantages of this solution are that:
  • The LXC guest and host shares their resources (CPU, RAM) with almost no penalty
  • Trisquel 8 is not a rolling release distribution
The disadvantage of this solution are that:
  • you need to configure again the Trisquel 8 LXC instance (vimrc, sshd_config, etc)
  • It's more complicated to setup
  • The Android build system output a warning message about not being able to use namespaces which may become mandatory in newer Android versions

LineageOS 16

Status with LineageOS 16

For now the focus is on rebasing all the changes on top of LineageOS 16:
  • nothing is usable so far, nothing has been tested yet on real devices
  • it can build images but it most probably contains proprietary software as it has not been removed yet
  • the commits and the manifests are constantly rebased

Repositories and changes for LineageOS 16

Building LineageOS 16 version

Source code

$ repo init -u https://git.replicant.us/GNUtoo/manifest.git -b GNUtoo/replicant-9

The code is being rebased on top of the i9300 unofficial support for LineageOS

$ rm -rf .repo/manifests/ # This enables me to force push and rebase the manifest repository as well
$ repo init -u https://git.replicant.us/GNUtoo/manifest.git -b GNUtoo/lineage-16.0_i9300
$ repo sync --force-sync

For Trisquel8
sudo apt-get install bc bison build-essential ccache curl flex g++-multilib gcc-multilib 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 pngcrush rsync schedtool squashfs-tools xsltproc zip zlib1g-dev gcc-5-arm-linux-gnueabi

Launching the build

Follow the i9300 manifest instructions:

$ subject='/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'
$ mkdir .android-certs
$ for x in releasekey platform shared media testkey; do \
  ./development/tools/make_key .android-certs/$x "$subject"; \
  done
$ parallel_tasks=$(echo "$(grep 'processor' /proc/cpuinfo | wc -l ) + 1" | bc)
$ source build/envsetup.sh
$ lunch lineage_i9300-userdebug
$ make -j${parallel_tasks} bacon

TODO

First month of full time equivalent work:

Time estimation Task Comments
DONE boot a device under AOSP9 Only boots with graphics, not much more
7h DONE build it under a FSDG compliant distribution 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
Builds under Trisquel8
21h * port the changes from AOSP9 to LineageOS 16
* cleanup the code
* build the kernel from the Android build system
* make sure it builds with an FSDG compliant distribution
* document the build procedure
14h find, remove and document proprietary software in LineageOS 16
21h find, remove and document privacy issues in LineageOS 16
7h port the touch keys Linux driver
7h upstream the AAT1290 flash led Linux driver dts for the galaxy-s3 boards Upstream has already a driver, only the device DTS seem to be lacking. Simon Shields commit doesn't have a signed-off-by.
7h rebrand LineageOS as Replicant
70h port and cleanup the the Galaxy SIII (i9300) modem Linux driver from 4.16 to 5.0
Total: 147h (~1 month)
Second month of full time equivalent work:
* port libsamsung-ril and libsamsung-ipc to Android 9
* 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
libsamsung-ipc and samsung-ril were fixed to compile on Android 9.
The code was not yet tested at runtime.
It also probably still need to be adapted to trebble or the new RIL interfaces to be more substainable.
Total 157h ~1 month
Third month of full time equivalent work:
Task Time estimation Comments
port the sensors libraries and other device specific libraries 70h Already done by the unofficial LineageOS port of the Galaxy SIII (i9300), needs testing
add support for Audio with the upstream kernel driver 70h Might be way faster, depending on what Android 9 uses
add partial (no modem) support for the Galaxy SIII (i9300) Galaxy SIII 4G (i9305) and factorize the code with i9305 14h The work for the Galaxy SIII (i9300) has already been done by the unofficial LineageOS port.
It needs to be adapted to the upstream kernel and not to use proprietary libraries.
It also needs to be adapted to the Galaxy SIII 4G (i9305)
Total 154h ~1 month
Task Time estimation Comments
create a recovery 21h
add internal WiFi support and validate the functionality 6h
add external WiFi dongles support 20h External dongles support might be tricky
create new update the install and upgrade instructions 35h Our current install instructions don't scale as we have one copy for each device.
We also created generic instructions but they tend to be harder to follow1 than the device specific ones.
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.
The instructions will need to be able to be modified and compiled on an FSDG compliant distribution.
Task Time estimation Comments
Estimate the amount of work to Reduce the attack surface ?
Estimate the amount of work to add in-system upgrades ?

1 The generic instructions were tested at Install parties in Paris

Devices support:

Easy, because it's similar enough to the Galaxy SIII (I9300)

Galaxy Note II (N7100)
Task Time estimation Comments
port the EA8061 LCD Linux driver 35h
port the S6EVR02 LCD Linux driver 35h
port the MAX77693 flash led Linux driver 7h
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
port the sensors libraries and other device specific libraries 70h It's difficult to evaluate how much time it could take
add support for Audio with the upstream kernel driver 14h Should be similar to the Galaxy SIII
Galaxy Note 8.0 (N5100) and 8.0 WiFi (N5110)
Task Time estimation Comments
Evaluate the time required to do the port 14h TODO

Needs more work and unknown upstream Linux status

Device Time estimation Comments
Galaxy S II (i9100) Linux: devboard dts upstream? unknown status
Galaxy Note (N7000) unknown Linux upstream status
Galaxy Nexus (I9250) OMAP4, no dts upsrteam
Galaxy Tab 2 7.0 (P3100), 7.0 WiFi (P3110), 10.1 (P5100), 10.1 WiFi (P5110)
GTA04 >= A4 TODO: a RIL needs to be written, userspace GPS support is missing, audio scenarios, etc

Documentation

Replicant 6.0 changes

Repository path rebase worked Changes
build No
manifest No N/A
bootable/recovery Yes * UI changes to improve usability
* Branding
* Small fix(es)
external/boringssl Yes * Small fix(es)
external/heimdall No
frameworks/av Yes * Software rendering fix(es)
frameworks/base Yes * WiFi fixe(s) for external dongles
* Software rendering fix(es)
* Privacy fix(es)
* Security improvements
* Usability improvements
frameworks/native No
hardware/broadcom/wlan Yes * Remove nonfree software
hardware/libhardware Yes * Software rendering fix(es)
hardware/libhardware_legacy Yes * Don't depend on nonfree software
hardware/ti/omap4 Yes * Remove nonfree software
* Don't depend on nonfree software
* Small fix(es)
libcore Yes * Small fix(es)
packages/apps/Browser Yes * Privacy fix(es)
* Branding
* Small fix(es)
packages/apps/LegacyCamera Yes * Software rendering fix(es)
* Small fix(es)
packages/apps/RepWifi Not upstreamed, obsolete N/A
packages/apps/ReplicantWallpapers Not upstreamed * Branding
packages/apps/Settings No
packages/apps/SetupWizard Yes * Privacy fix(es)
* Don't depend on nonfree software
* Branding
packages/apps/ThemeChooser Yes * Privacy fix(es) ?
* Don't depend on nonfree software ?
packages/providers/ContactsProvider Yes * Small fix(es)
system/core Yes * Branding
* various fixes
vendor/replicant No
vendor/cmsdk Yes * Branding
external/chromium-webview ? ?
external/drm_gralloc Yes * Software rendering fix(es)
external/llvm Yes * Software rendering fix(es)
external/mesa3d Yes * Software rendering fix(es)
* Performance debugging for software rendering
external/parameter-framework Yes * Small fix(es)
external/protobuf N/A No changes
prebuilts/ndk ? ?
prebuilts/sdk ? ?
sdk Yes * Small fix(es)
toolchain/src/binutils Yes * Small fix(es)
toolchain/src/gcc No
toolchain/src/jack Yes * Small fix(es)
toolchain/src/jill Yes * Small fix(es)
kernel/samsung/smdk4412 Yes * Security fixes
* Privacy Fixes (TrustZone)
* Don't depend on nonfree software
* Remove nonfree software
* Small fix(es)
kernel/samsung/tuna
kernel/samsung/espresso10
device/samsung/i9100 No * Replace nonfree software by free software
* free software sensors implementation(s)
* free software modem audio implementation(s)
* Software rendering fix(es)
* Privacy Fixes (TrustZone)
* Don't depend on nonfree software
* Remove nonfree software
* Branding
* Small fix(es)
device/samsung/n7000 Yes
device/samsung/i9300 No
device/samsung/i9305 No
device/samsung/n7100 Yes
device/samsung/n5100 Yes
device/samsung/n5110 Yes
device/samsung/maguro Yes
device/samsung/tuna Yes
device/samsung/espressowifi Yes
device/samsung/espresso3g Yes
device/samsung/galaxys2-common Yes
device/samsung/smdk4412-common No
device/samsung/kona-common Yes
hardware/ril/samsung-ril Not upstreamed N/A
external/libsamsung-ipc Not upstreamed N/A
hardware/tinyalsa-audio Not upstreamed? N/A

CustomROMs i9300 components

Repository Tree path Dependencies Function Comments
https://github.com/CustomROMs/android_hardware_samsung
lineage-16.0 branch
hardware/samsung/macloader Loads the MAC Address of the WiFi network interface Might be useful
hardware/samsung/wifiloader Loads the wifi kernel module (like modprobe) and setup firmware filesystems permissions May be useful
hardware/samsung/audio seems to contains ril related stuff as well Look if the ril stuff is required, go for standard audio
hardware/samsung/lineagehw/hidl/livedisplay livedisplay is a feature similar to what redshift does on GNU/Linux Not sure if it works with mainline
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
all other directories in hardware/samsung/exynos/ nonfree firmwares, nonfree software?, smdk kernel? audio/video decoding offload Avoid using that
hardware/samsung/exynos3 nonfree firmwares?, nonfree software?, smdk kernel? some light libraries, display stuff (gralloc, etc), 2D acceleration (FIMG), camera (FIMC), 3D acceleration, etc Avoid using that for now
hardware/samsung/exynos4

Links

Updated by Denis 'GNUtoo' Carikli 3 months ago · 132 revisions