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# Instructions for building the Gonk port
## Set up an android toolchain and NDK
Follow the steps [here](https://github.com/servo/servo/wiki/Building-for-Android) for setting up the Android NDK
and toolchain.
## Bootstrap B2G
We have a bootstrap of the require B2G prebuilt binaries, assuming that you are targeting a Flame device.
```
curl https://servo-rust.s3.amazonaws.com/B2G/B2G.tgz
tar zxvf B2G.tgz
```
## Build B2G
If you are not using a Flame or just would like to have a local build of the binaries, you can also build B2G locally. Note: this will take a long time and will take around 20GB of space
Disable the screen timeout on the device, and connect to wifi. Also connect it to your computer
with remote debugging enabled.
```
git clone https://github.com/mozilla-b2g/B2G
./config.sh flame-kk
```
If behind a firewall, put the following in your gitconfig:
```
[url "https://github"]
insteadOf = git://github
[url "https://git.mozilla.org/external/caf"]
insteadOf = git://codeaurora.org
```
Then run
```
./build.sh libssl libsuspend libz libGLESv2 toolbox libhardware
```
## Build B2S
Either set the corresponding `b2g` key in `.servobuild` to the path to the B2G bootstrap or clone (along with), or set the `$GONKDIR` environment variable.
Do the same for the `ndk` and `toolchain` keys (`$ANDROID_NDK` and `$ANDROID_TOOLCHAIN` respectively)
Run `./mach build-gonk` from the root directory
## Copy the files to the Flame
To reduce the size of libmozjs.so (`target/arm-linux-androideabi/build/mozjs-sys-*/out/libmozjs.so`),
you can run `strip` on it. Use the one in your toolchain (`$ANDROID_TOOLCHAIN/bin/arm-linux-androideabi-strip libmozjs.so`).
Make sure the device is on, connected to wifi, with high or no screen timeout.
```
# Switch to a read-write system
adb remount
# Copy mozjs
adb push /path/to/stripped/mozjs.so system/lib
# Copy b2s
adb push target/arm-linux-androideabi system/bin
# Copy resources
adb shell mkdir sdcard/servo
adb push resources sdcard/servo
```
## Run B2S
Make sure you're still connected to wifi
```
adb shell stop b2g
adb shell "echo 127 > /sys/class/leds/lcd-backlight/brightness”
adb shell start b2g
```
Now run `adb shell`, `cd` to `system/bin`, and run `./b2s <url>`
If the screen keeps alternating between B2G and B2S, run `adb shell stop b2g` (you can restart it later).
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