Android Automotive Rapberry Pi 4

📝 TODO

• ✔️ WiFi
• ✅ Can-Bus
• ⚙️ Vehicle Hal
• ❌ Secondary screen / Instrument Cluster
• ➖ GPS
• ❌ Bluetooth
• ➖ Camera Support
• ⚙️ Support more Can-Bus Hat's

Initialize AOSP source

  $ repo init -u https://android.googlesource.com/platform/manifest -b android-10.0.0_r39 --current-branch --no-tags --no-clone-bundle --depth 1

Set local repos

  $ git clone https://github.com/android-rpi/local_manifests .repo/local_manifests -b arpi-10

Make changes to local manifest

• edit .repo/local_manifests/defualt.xml
• add remote <remote name="arpicar" fetch="https://github.com/manmountain"/>
• change <project path="device/arpi/rpi4" name="device_arpi_rpi4" revision="arpi-10" remote="arpi"/>
• to <project path="device/arpi/rpi4car" name="device_arpi_rpi4car" revision="arpi-10" remote="arpicar"/>
• add remote <remote name="linux-can" fetch="https://github.com/linux-can"/>
• add <project path="vendor/can/can-utils" name="can-utils" revision="master" remote="linux-can"/>

Get the AOSP source

  $ repo sync --current-branch --no-tags --no-clone-bundle --force-sync -j4

Install kernel driver patch for can bus hat

  $ cd kernel/arpi
  $ patch -p2 < ../../device/arpi/rpi4car/patches/mcp25xxfd-V8.2.patch

Configure Kernel

  $ cd kernel/arpi
  $ ARCH=arm scripts/kconfig/merge_config.sh arch/arm/configs/bcm2711_defconfig kernel/configs/android-base.config kernel/configs/android-recommended.config

Edit Kernel .config

• set CONFIG_CAN to CONFIG_CAN=y
• set CONFIG_CAN_RAW to CONFIG_CAN_RAW=y
• set CONFIG_CAN_BCM to CONFIG_CAN_BCM=y
• set CONFIG_CAN_GW to CONFIG_CAN_GW=y
• set CONFIG_CAN_J1939 to CONFIG_CAN_J1939=y
• set CONFIG_CAN_SLCAN to CONFIG_CAN_SLCAN=y
• set CONFIG_CAN_DEV to CONFIG_CAN_DEV=y
• set CONFIG_CAN_CALC_BITTIMING to CONFIG_CAN_CALC_BITTIMING=y
• add CONFIG_CAN_MCP25XXFD=y
• set CONFIG_CAN_MCP251X to CONFIG_CAN_MCP251X=y
• set CONFIG_SPI_BCM2835 to CONFIG_SPI_BCM2835=y
• set CONFIG_SPI_BCM2835AUX to CONFIG_SPI_BCM2835AUX=y

Build Kernel

  $ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make -j4 zImage
  $ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make -j4 dtbs

Build Android source

  $ source build/envsetup.sh
  $ lunch rpi4car-userdebug
  $ make -j4 ramdisk systemimage vendorimage userdataimage

Use -j[n] option with make, if build host has a good number of CPU cores.

Write to sdcard

Insert sdcard, get <device> with lsblk cmd and run

  $ device/arpi/rpi4car/mksdcard.sh <device>

Checks we can do to verify that the can-bus works

• TODO