Linux: how to enable all uart in beagle bone rev c using i-processor-sdk-linux-am335x-evm-04.03.00.05

Hi Shilesh,

You need to add uart node (similar to uart0) with "status = okay" entry. You need also add the UART pinmux.

See for example how am335x-evm.dts enable two uarts (uart0 for console and uart1):

chosen {
        stdout-path = &uart0;
    };

uart0_pins: pinmux_uart0_pins {
        pinctrl-single,pins = <
            AM33XX_IOPAD(0x970, PIN_INPUT_PULLUP | MUX_MODE0)    /* uart0_rxd.uart0_rxd */
            AM33XX_IOPAD(0x974, PIN_OUTPUT_PULLDOWN | MUX_MODE0)    /* uart0_txd.uart0_txd */
        >;
    };

    uart1_pins: pinmux_uart1_pins {
        pinctrl-single,pins = <
            AM33XX_IOPAD(0x978, PIN_INPUT | MUX_MODE0)        /* uart1_ctsn.uart1_ctsn */
            AM33XX_IOPAD(0x97C, PIN_OUTPUT_PULLDOWN | MUX_MODE0)    /* uart1_rtsn.uart1_rtsn */
            AM33XX_IOPAD(0x980, PIN_INPUT_PULLUP | MUX_MODE0)    /* uart1_rxd.uart1_rxd */
            AM33XX_IOPAD(0x984, PIN_OUTPUT_PULLDOWN | MUX_MODE0)    /* uart1_txd.uart1_txd */
        >;
    };

&uart0 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart0_pins>;

    status = "okay";
};

&uart1 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart1_pins>;

    status = "okay";
};

You should enable the rest of the uarts (uart2/3/4/5) in similar way. Check also how uart2 is enabled in am335x-baltos-ir5221.dts, uart3 in am335x-boneblue.dts,

Check also below docs:

linux-kernel/Documentation/devicetree/bindings/serial/serial.txt
linux-kernel/Documentation/devicetree/bindings/serial/omap_serial.txt

Regards,
Pavel