Firefly-RK3288 使用uart4

Chip Platform Rockchip
1

Firefly-RK3288 Android5.1 SPI0和UART4是复用，而软件默认是打开SPI0功能，如果需要UART4功能，只需要添加如下补丁进行修改即可

diff --git a/device/rockchip/common/init.connectivity.rc b/device/rockchip/common/init.connectivity.rc
index 36e7c14..12cdfdf 100755
— a/device/rockchip/common/init.connectivity.rc
+++ b/device/rockchip/common/init.connectivity.rc
@@ -60,10 +60,12 @@ on boot
# bluetooth power up/down interface
chmod 0660 /dev/ttyS0
chmod 0666 /dev/ttyS1

  • chmod 0666 /dev/ttyS4
    chmod 0660 /dev/vflash
    chown bluetooth net_bt_stack /dev/vflash
    chown bluetooth net_bt_stack /dev/ttyS1
    chown bluetooth net_bt_stack /dev/ttyS0
  • chown root root /dev/ttyS4
    chown bluetooth net_bt_stack /sys/class/rfkill/rfkill0/type
    chown bluetooth net_bt_stack /sys/class/rfkill/rfkill0/state
    chmod 0664 /sys/class/rfkill/rfkill0/state
    diff --git a/kernel/arch/arm/boot/dts/firefly-rk3288.dts b/kernel/arch/arm/boot/dts/firefly-rk3288.dts
    index 5e69784..7a246a1 100755
    — a/kernel/arch/arm/boot/dts/firefly-rk3288.dts
    +++ b/kernel/arch/arm/boot/dts/firefly-rk3288.dts
    @@ -310,7 +310,7 @@
    };

&spi0 {

  • status = “okay”;
  • status = “disabled”;
    max-freq = <48000000>;
    spidev@00 {
    compatible = “linux,spidev”;
    @@ -423,6 +423,10 @@
    status = “okay”;
    };

+&uart_exp {

  • status = “okay”;
    +};