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external/cache/sources/rtk_hciattach/Readme.txt

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+The document describes how to support Realtek UART Bluetooth driver in Linux system.
+
+The supported kernel version is 2.6.32 - 4.15
+
+The default serial protocol of Realtek Bluetooth chip is Three-wire (H5) protocol
+with flow control on, parity even and internel 32k clock.
+
+The default baud rate is 115200.
+
+To support Three-wire (H5) protocol, you need to install Realtek hci_uart driver
+and rtk_hciattach tool.
+
+1. make sure your UART setting is correct.
+   host tx  - controller rx
+   host rx  - controller tx
+   host rts - controller cts
+   host cts - ground
+        NC  - controller rts
+
+2. Install Bluetooth kernel driver and rtk_hciattach tool
+   $ sudo make install
+   If you encounter an error like "depmod: ERROR: Bad version passed /lib/modules/...",
+   please change the lines "depmod -a $(MDL_DIR)" to "depmod -a $(shell uname -r)"
+
+3. Initialize Realtek Bluetooth chip by rtk_hciattach
+   $ sudo rtk_hciattach -n -s 115200 ttyUSB0 rtk_h5
+
+   for H4 protocol chip
+   $ sudo rtk_hciattach -n -s 115200 ttyUSB0 rtk_h4
+
+Tips: ttyUSB0 is serial port name in your system, you should change it
+      according to hardware such as ttyS0.
+
+4. Uninstall
+   $ sudo make uninstall
+
+If you want to change the parameter such as baud rate and pcm settings, you
+should modify rtl8xxx_config file.
+