查看板卡设备存在

root@localhost:~# ls /dev/ttyAMA*
ttyAMA0  ttyAMA1 。

官方哪里又要了一个内和设备树补丁。这个补丁很重要，应该是更改了pl011的驱动匹配。

diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
index 2fe86aca32da..e316bb09f7a1 100644
--- a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
@@ -894,26 +894,29 @@
 		};
 
 		uart1: serial@21d0000 {
-			compatible = "arm,sbsa-uart","arm,pl011";
+			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0x21d0000 0x0 0x1000>;
 			interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
-			current-speed = <115200>;
+			clocks = <&clockgen 4 7>, <&clockgen 4 7>;
+			clock-names = "uart", "apb_pclk";
 			status = "disabled";
 		};
 
 		uart2: serial@21e0000 {
-			compatible = "arm,sbsa-uart","arm,pl011";
+			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0x21e0000 0x0 0x1000>;
 			interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
-			current-speed = <115200>;
+			clocks = <&clockgen 4 7>, <&clockgen 4 7>;
+			clock-names = "uart", "apb_pclk";
 			status = "disabled";
 		};
 
 		uart3: serial@21f0000 {
-			compatible = "arm,sbsa-uart","arm,pl011";
+			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0x21f0000 0x0 0x1000>;
 			interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
-			current-speed = <115200>;
+			clocks = <&clockgen 4 7>, <&clockgen 4 7>;
+			clock-names = "uart", "apb_pclk";
 			status = "disabled";
 		};
 
--