TX2开发板系统默认有ttyTHS1,ttyTHS2,ttyTHS3串口，通过修改设备树文件，可以使用６个串口。

１．设备树修改：

修改文件：

JetPack/3.1/64_TX2/Linux_for_Tegra_64_tx2/kernel/dtb/tegra186-quill-p3310-1000-c03-00-base.dtb

中serial4，serial５，serial６状态为okay,例：

serial@3140000 {
		compatible = "nvidia,tegra186-hsuart";
		#stream-id-cells = <0x1>;
		reg = <0x0 0x3140000 0x0 0x40>;
		reg-shift = <0x2>;
		interrupts = <0x0 0x74 0x4>;
		nvidia,memory-clients = <0xe>;
		dmas = <0x19 0x14 0x19 0x14>;
		dma-names = "rx", "tx";
		clocks = <0xd 0xc2 0xd 0x10d>;
		clock-names = "serial", "parent";
		resets = <0xd 0x84>;
		reset-names = "serial";
		status = "okay";
		nvidia,adjust-baud-rates = <0x1c200 0x1c200 0x64>;
		linux,phandle = <0x87>;
		phandle = <0x87>;
	};

2.设备树和串口对应关系

serial1 = "/serial@3110000";//ttyTHS1
serial2 = "/serial@c280000";//ttyTHS2
serial3 = "/serial@3130000";//ttyTHS3
serial4 = "/serial@3140000";//tttTHS4
serial5 = "/serial@3150000";//ttyTHS5
serial6 = "/serial@c290000";//ttyTHS6

3．设备树烧写方法：

TX2　开机进入recovery模式(每次只能执行一次烧写命令)，在JetPack/64_TX2/Linux_for_Tegra下执行如下命令即可烧写成功：

sudo ./flash.sh -r -k kernel-dtb jetson-tx2 mmcblk0p1