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feat(android): Add M.2 WiFi/Bluetooth Module Setup application note
Add a new application note documenting the Android build system modifications required to integrate third-party M.2 WiFi/Bluetooth modules on AM62Px-SK and AM62x-SK EVMs. The guide covers: - WiFi firmware setup (Android.bp, product makefile) - Bluetooth configuration (HAL, permissions, properties) - SELinux policy for UART access - ueventd permissions Signed-off-by: Guillaume La Roque <[email protected]>
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‎configs/AM62PX/AM62PX_android_toc.txt‎

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devices/AM62PX/android/Application_Notes
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devices/AM62PX/android/Application_Notes_dtbo_support
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android/Application_Notes_M2_WiFi_BT
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android/Application_Notes_Android_Bootloader_SD_Card
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android/Application_Notes_Android_Dual_Screen
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android/Application_Notes_Android_Low_Power

‎configs/AM62X/AM62X_android_toc.txt‎

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devices/AM62X/android/Application_Notes_dtbo_support
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devices/AM62X/android/Application_Notes_BeaglePlay
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android/Application_Notes_M2_WiFi_BT
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android/Application_Notes_Android_Bootloader_SD_Card
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android/Application_Notes_Android_Dual_Screen
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android/Application_Notes_Android_Low_Power

‎source/android/Application_Notes_M2_WiFi_BT.rst‎

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.. _android-m2-wifi-bt:
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###############################
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M.2 WiFi/Bluetooth Module Setup
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###############################
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This application note describes the Android build system modifications required
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to integrate third-party M.2 WiFi/Bluetooth modules.
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.. warning::
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This guide assumes the kernel already includes the required drivers and
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device tree overlays. For kernel configuration, refer to :ref:`android-build-kernel`.
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************
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Introduction
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************
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The AM62Px-SK and AM62x-SK EVMs include an M.2 Key E connector that supports
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WiFi/Bluetooth combo modules. These modules typically use:
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- **SDIO** interface for WiFi
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- **UART** interface for Bluetooth
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This guide lists the files that need to be modified in the Android build system
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to add support for a new WiFi/Bluetooth module.
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**********************
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WiFi Firmware Setup
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**********************
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.. note::
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Depending on your WiFi chipset, you may also need to modify the WiFi HAL
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configuration in :file:`device/ti/am62x/shared/wifi/`. The default configuration
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uses TI-specific libraries (``lib_driver_cmd_ti``). For other chipsets, you may
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need to update :file:`BoardConfig.mk` to use the appropriate driver library
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(e.g., ``lib_driver_cmd_nl80211`` for generic NL80211 drivers).
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Adding firmware files
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=====================
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Copy the firmware files to the appropriate directory:
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.. code-block:: console
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$ cp <firmware_file> \
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${YOUR_PATH}/ti-aosp-16/vendor/ti/am62x/wifi/vendor/firmware/<vendor_dir>/
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Common vendor directories:
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- ``mrvl/`` for Marvell/NXP chipsets
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- ``ti-connectivity/`` for TI chipsets
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- ``brcm/`` for Broadcom/Cypress chipsets
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- ``nxp/`` for NXP Bluetooth firmware
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Modifying Android.bp
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====================
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Edit :file:`vendor/ti/am62x/wifi/Android.bp` and add a prebuilt_firmware module.
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.. code-block:: text
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prebuilt_firmware {
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name: "<package_name>",
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vendor: true,
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src: "vendor/firmware/<vendor_dir>/<firmware_file>",
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filename: "<firmware_file>",
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sub_dir: "<vendor_dir>",
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proprietary: true,
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}
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Modifying the product makefile
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==============================
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.. ifconfig:: CONFIG_part_variant in ('AM62PX')
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Edit :file:`vendor/ti/am62x/am62p.mk` and add the firmware to PRODUCT_PACKAGES.
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.. ifconfig:: CONFIG_part_variant in ('AM62X')
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Edit :file:`vendor/ti/am62x/am62x.mk` and add the firmware to PRODUCT_PACKAGES.
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.. code-block:: makefile
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PRODUCT_PACKAGES += \
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<package_name>
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************************
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Bluetooth Configuration
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************************
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M.2 WiFi/Bluetooth combo modules typically use UART for Bluetooth communication.
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The following files need to be modified to enable Bluetooth.
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Modifying shared/bluetooth/device_vendor.mk
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===========================================
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Edit :file:`device/ti/am62x/shared/bluetooth/device_vendor.mk` to enable Bluetooth
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permissions and HAL.
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Change from disabled Bluetooth:
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.. code-block:: makefile
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PRODUCT_COPY_FILES += \
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device/generic/car/common/android.hardware.disable.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.bluetooth.xml \
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device/generic/car/common/android.hardware.disable.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.bluetooth_le.xml
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To enabled Bluetooth:
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.. code-block:: makefile
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# Bluetooth configuration
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# Enable Bluetooth permissions
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PRODUCT_COPY_FILES += \
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frameworks/native/data/etc/android.hardware.bluetooth.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.bluetooth.xml \
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frameworks/native/data/etc/android.hardware.bluetooth_le.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.bluetooth_le.xml
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# Bluetooth HAL (AIDL)
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PRODUCT_PACKAGES += \
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android.hardware.bluetooth-service.default
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Modifying product.prop
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======================
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Edit :file:`device/ti/am62x/product.prop` and add Bluetooth properties.
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Example configuration (adjust profiles based on your module capabilities):
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.. code-block:: text
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# Bluetooth configuration
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# Set the Bluetooth Class of Device
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# Service Field: 0x5A -> 90
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# Bit 17: Networking
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# Bit 19: Capturing
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# Bit 20: Object Transfer
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# Bit 22: Telephony
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# MAJOR_CLASS: 0x01 -> 1 (Computer)
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# MINOR_CLASS: 0x04 -> 4 (Desktop workstation)
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bluetooth.device.class_of_device=90,1,4
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# Set supported Bluetooth profiles to enabled
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bluetooth.profile.asha.central.enabled?=true
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bluetooth.profile.a2dp.source.enabled?=true
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bluetooth.profile.avrcp.target.enabled?=true
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bluetooth.profile.gatt.enabled?=true
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bluetooth.profile.hfp.ag.enabled?=true
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bluetooth.profile.hid.device.enabled?=true
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bluetooth.profile.hid.host.enabled?=true
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bluetooth.profile.map.server.enabled?=true
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bluetooth.profile.opp.enabled?=true
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bluetooth.profile.pan.nap.enabled?=true
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bluetooth.profile.pan.panu.enabled?=true
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bluetooth.profile.pbap.server.enabled?=true
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# Disable LeAudio profiles (requires specific hardware support)
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bluetooth.profile.bap.broadcast.assist.enabled=false
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bluetooth.profile.bap.unicast.client.enabled=false
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bluetooth.profile.bas.client.enabled=false
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bluetooth.profile.ccp.server.enabled=false
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bluetooth.profile.csip.set_coordinator.enabled=false
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bluetooth.profile.hap.client.enabled=false
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bluetooth.profile.vcp.controller.enabled=false
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.. note::
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The ``bluetooth.profile.*.enabled?=true`` syntax (with ``?``) means the profile
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is enabled by default but can be overridden. Profiles disabled with ``=false``
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(without ``?``) cannot be overridden.
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Modifying ueventd.rc
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====================
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.. ifconfig:: CONFIG_part_variant in ('AM62PX')
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Edit :file:`device/ti/am62x/am62p/ueventd.am62p.rc` and add UART permissions:
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.. ifconfig:: CONFIG_part_variant in ('AM62X')
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Edit :file:`device/ti/am62x/am62x/ueventd.am62x.rc` and add UART permissions:
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.. code-block:: text
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# Bluetooth UART
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/dev/ttyS1 0660 bluetooth bluetooth
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.. note::
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The UART device name (``ttyS1``, ``ttyS2``, etc.) depends on your device tree
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overlay configuration.
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Modifying file_contexts
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=======================
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Edit :file:`device/ti/am62x/sepolicy/common/file_contexts` and add:
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.. code-block:: text
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# Bluetooth UART
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/dev/ttyS1 u:object_r:hci_attach_dev:s0
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Adding SELinux policy
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=====================
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Create :file:`device/ti/am62x/sepolicy/common/hal_bluetooth_default.te`:
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.. code-block:: text
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# Allow Bluetooth HAL to access UART device
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allow hal_bluetooth_default hci_attach_dev:chr_file rw_file_perms;
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***************
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Build and Flash
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***************
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Rebuild Android
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===============
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.. code-block:: console
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$ cd ${YOUR_PATH}/ti-aosp-16
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$ source build/envsetup.sh
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$ lunch <BUILD_TARGET>
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$ m
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Flash the device
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================
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After building, perform a full reflash of the device following the standard
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flashing procedure documented in :ref:`android-flashing`.
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Configure DTBO
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==============
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After flashing, configure the DTBO index from U-Boot:
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.. code-block:: console
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=> env set adtbo_idx <your_dtbo_index>
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=> saveenv
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=> reset
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Refer to :ref:`android-dtbo` for the list of available DTBOs and their indices.
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*******
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Summary
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*******
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The following files need to be modified to add WiFi/Bluetooth support:
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.. ifconfig:: CONFIG_part_variant in ('AM62PX')
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.. list-table::
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:header-rows: 1
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:widths: 50 50
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* - File
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- Purpose
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* - :file:`vendor/ti/am62x/wifi/Android.bp`
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- Add prebuilt_firmware module for WiFi/BT firmware
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* - :file:`vendor/ti/am62x/am62p.mk`
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- Add firmware to PRODUCT_PACKAGES
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* - :file:`device/ti/am62x/shared/bluetooth/device_vendor.mk`
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- Enable Bluetooth permissions XML and HAL
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* - :file:`device/ti/am62x/product.prop`
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- Add Bluetooth properties (class of device, profiles)
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* - :file:`device/ti/am62x/am62p/ueventd.am62p.rc`
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- Set UART device permissions for Bluetooth
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* - :file:`device/ti/am62x/sepolicy/common/file_contexts`
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- Add SELinux context for Bluetooth UART
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* - :file:`device/ti/am62x/sepolicy/common/hal_bluetooth_default.te`
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- Add SELinux policy for Bluetooth HAL UART access
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.. ifconfig:: CONFIG_part_variant in ('AM62X')
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.. list-table::
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:header-rows: 1
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:widths: 50 50
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* - File
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- Purpose
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* - :file:`vendor/ti/am62x/wifi/Android.bp`
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- Add prebuilt_firmware module for WiFi/BT firmware
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* - :file:`vendor/ti/am62x/am62x.mk`
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- Add firmware to PRODUCT_PACKAGES
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* - :file:`device/ti/am62x/shared/bluetooth/device_vendor.mk`
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- Enable Bluetooth permissions XML and HAL
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* - :file:`device/ti/am62x/product.prop`
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- Add Bluetooth properties (class of device, profiles)
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* - :file:`device/ti/am62x/am62x/ueventd.am62x.rc`
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- Set UART device permissions for Bluetooth
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* - :file:`device/ti/am62x/sepolicy/common/file_contexts`
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- Add SELinux context for Bluetooth UART
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* - :file:`device/ti/am62x/sepolicy/common/hal_bluetooth_default.te`
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- Add SELinux policy for Bluetooth HAL UART access

‎source/devices/AM62PX/android/Application_Notes.rst‎

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/android/Application_Notes_Partitions
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Application_Notes_dtbo_support
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/android/Application_Notes_M2_WiFi_BT
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/android/Application_Notes_Android_Bootloader_SD_Card
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/android/Application_Notes_Android_SD_CARD
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/android/Application_Notes_Android_Dual_Screen

‎source/devices/AM62X/android/Application_Notes.rst‎

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/android/Application_Notes_Partitions
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Application_Notes_dtbo_support
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/android/Application_Notes_M2_WiFi_BT
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/android/Application_Notes_Android_Bootloader_SD_Card
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/android/Application_Notes_Android_SD_CARD
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/android/Application_Notes_Android_Dual_Screen

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