AM6421: AM6421 USE MAIN GPIO IN MCU R5F1_0 firmware

Narasimha Rao

Intellectual 615 points

Part Number: AM6421

HI,

We want to use below main Domain GPIO's in MCU (R5F1_0)firmware on Linux.

(D16) UART1_CTSn.GPIO1_58

(E16) UART1_RTSn.GPIO1_59

We are able to remote boot the R5F1_0 firmware successfully. But the above GPIO's are not working from R5F1_0 firmware in Linux.

Please give the details of how to declare the above GPIO in device tree to work from R5F1_0 firmware from linux.

We tried with below device tree changes ,but not working

&main_pmx0 {
   mygpio1_pins_default: mygpio1-default-pins {
       pinctrl-single,pins = <
           AM64X_IOPAD(0x0248, PIN_INPUT, 7) /* (D16) UART1_CTSn.GPIO1_58 */
           AM64X_IOPAD(0x024c, PIN_INPUT, 7) /* (E16) UART1_RTSn.GPIO1_59 */
       >;
   };
};

Please provide the way to make it work.

Thank you.

over 1 year ago

0 Anshu Madwesh over 1 year ago

TI__Mastermind 18270 points

Hello,

Looks like you are missing a reference node to the PinMux. See this E2E Thread for an example of adding a reference node: e2e.ti.com/.../4804378

Best Regards,

Anshu

0 Narasimha Rao over 1 year ago

Intellectual 615 points

Hi Anshu,

Please provide the procedure.

We want below main gpios

(D16) UART1_CTSn.GPIO1_58

(E16) UART1_RTSn.GPIO1_59

to be controlled from R5F1_0 firmware , remote booting from Linux.

Please tell us the procedure if any main gpio can be used on r5f cores remote booted frpom Linux.

Thank You.

0 Anshu Madwesh over 1 year ago in reply to Narasimha Rao

TI__Mastermind 18270 points

Hi,

I will look into this further and respond on this thread accordingly.

Best Regards,

Anshu

0 Anshu Madwesh over 1 year ago in reply to Anshu Madwesh

TI__Mastermind 18270 points

Hi,

It should be possible to access the Main Domain GPIOs from the R5F Core. You will just need to add a reference node as I mentioned in a previous post.

Best Regards,
Anshu

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AM6421: AM6421 USE MAIN GPIO IN MCU R5F1_0 firmware