The iMX6 Android system supports the VK1613 GPS module, which corresponds to the UART4 interface. The serial port is occupied by GPS and cannot be used as a normal serial port. How should iMX6 UART4 be released from GPS?
Platform Introduction:
The hardware platform used for this verification is the Feiling Embedded OKMX6Q-C development board (product details: www.forlinx.com/68.htm), based on the ARM Corte-A9 architecture, i.MX6Q quad-core processor, other platforms are available Reference use. The specific operation steps for unoccupying are as follows:
1. Remove the definition in the init.rc file
diff --git a/device/fsl/sabresd_6dq/init.rc b/device/fsl/sabresd_6dq/init.rc
index 8be2c838c9..ce674ae330 100755
--- a/device/fsl/sabresd_6dq/init.rc
+++ b/device/fsl/sabresd_6dq/init.rc
@@ -23,7 +23,7 @@ on boot
symlink /dev/mxs_viim /dev/mxc_mem
# Set GPS serial and reset GPIO pin-
setprop ro.kernel.android.gps /dev/ttymxc3
-
#setprop ro.kernel.android.gps /dev/ttymxc3
#setprop ro.kernel.android.gps /dev/athrnmea
#setprop persist.gps.oacmode @f
#symlink /dev/ttymxc3 /dev/gpsdevice
2. Prohibit the compilation of GPS related content
mv hardware/imx/libgps-vk/Android.mk hardware/imx/libgps-vk/Android.txt
mv hardware/imx/libgps/Android.mk hardware/imx/libgps/Android.txt
3. Empty the original compiled content
make clean
Just recompile (the recompilation takes a long time, so be patient)