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SK-AM62: enable UART port

chetana patil
Prodigy 200 points
Part Number: SK-AM62

Tool/software:

Hi,

I want to evaluate UART port for custom serial driver on SK-AM62 eval board. as I can see in device tree SOC or main_uart1 Main UART1 is used by TIFS firmware and marked "reserved". Is there any limitation utilizing it?. Can I simply change status to "okay" and evaluate custom driver?

Thanks,

Chetana

  • +1
    TI__Guru**** 169001 points

    Hi Chetana,

    chetana patil said:
    Can I simply change status to "okay" and evaluate custom driver?

    Though I didn't test this, yes you should be able to enable it in kernel device tree and use it in Linux.

    AM62x MAIN UART1 is reserved for TIFS logging, but TIFS logging to UART is by default disabled in boardcfg in U-Boot, so Linux should be able to just enable and use MAIN UART1.

  • 0 in reply to Bin Liu
    Prodigy 200 points

    I have enabled it by including following in DTS that didnt. it doesnt boot up or I cant see any uboot logs on Uart0 with these changes


    main_uart1_pins_default: main-uart1-pins-default {
    pinctrl-single,pins = <
    AM62PX_IOPAD(0x01ac, PIN_INPUT, 2) /* (G23) MCASP0_AFSR.UART1_RXD */
    AM62PX_IOPAD(0x01b0, PIN_OUTPUT, 2) /* (G20) MCASP0_ACLKR.UART1_TXD */
    >;
    };

    &main_uart1 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&main_uart1_pins_default>;
    interrupts-extended = <&gic500 GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>,
    <&main_pmx0 0x01ac>; /* (D14) UART1_RXD PADCONFIG114 */
    interrupt-names = "irq", "wakeup";
    };

  • 0 in reply to chetana patil
    TI__Guru**** 169001 points

    I thought you were trying to use main uart1 in Linux applications, but now it appears you want to use it as the U-Boot/Linux console. I am routing your query to our U-Boot expert for comments.

  • 0 in reply to Bin Liu
    Prodigy 200 points

    yes I was trying to use main_uart1 for Linux application itself. what mistake have I made? that it now configures to U-Boot cosole

  • 0 in reply to chetana patil
    TI__Guru**** 169001 points

    I think I am kind of confused.

    If you want to use main_uart1 in Linux application, you only need to modify the kernel DTS to enable this uart. This change should not have anything to do with U-Boot. I don't understand why your U-Boot console doesn't print any message now?