LPUART1 not functioning in LS1021A-IOT Board Rev1

[pranavmadhu]

Hi,

I'm new to yocto projects. I'm having an LS1021A-IOT Board rev1, and yocto sdk v1.8. The UART1 in the board is working properly while using the default RCW.

	00000000: 0608000a 00000000 00000000 00000000
	00000010: 20000000 08407900 60025a00 21046000
	00000020: 00000000 00000000 00000000 00038000
	00000030: 20024800 881b1340 00000000 00000000

I've edited the RCW to enable LPUART1 as

	00000000: 0608000a 00000000 00000000 00000000
	00000010: 20000000 08407900 60025a00 21046000
	00000020: 00000000 00000000 00000000 10038000
	00000030: 20024800 881b1340 00000000 00000000

While using the modified RCW in our board, we are not getting u-boot as well as filesystem console in UART1, but kernel prints are getting. I've also probed the 1st and 2nd (LPUART1 SIN & SOUT) pin in J17 connector, but I didn't notice any deflection. Can you please help me to solve this problem?

LPUART1 support is enabled in the device tree source

in ls1021a.dtsi,

	lpuart0: serial@2950000 {
		compatible = "fsl,ls1021a-lpuart";
		reg = <0x2950000 0x1000>;
		interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&sysclk>;
		clock-names = "ipg";
		status = "disabled";
	};

and in ls1021a-iot.dts file as

     &lpuart0 {

         status = "okay";

     };

[prabinca4u · Accepted solution]

I just Found this is an erratum of SOC Rev 1. ie uart1 is enabled along with LPUART or UART2 make uart is malfunction......!

This is solved in rev 2 SOC.

[pranavmadhu]

Thanks Prabin... I think this issue may be resolved in rev2. Thanks for your effort...

[prabinca4u]

You are welcome :smileyhappy:

[nikhilprakash]

I am also having the same issue!

[prabinca4u]

I Have the same issue on my ls1021a-iot board rev1....Thanks for posting this forum.....!