AM572x debug UART change

Hong Tay

Expert 2465 points

Hi Sir,

May I know how to change the code from UART3 to switch to UART2 we want to do debugging using UART2?

Thanks. Hope to hear from you soon.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Rahul Prabhu over 8 years ago

TI__Guru** 116170 points

Can you please specify which Hardware(EVM, IDK) and OS(Linux, RTOS) you are working with.

For RTOS, we have an application notes that archives steps involved in changing the debug UART on AM335x platfrom that you can refer:
www.ti.com/.../sprac32.pdf

regards,
Rahul

0 Hong Tay over 8 years ago in reply to Biser Gatchev-XID

Expert 2465 points

Hi Biser,

Thanks for your support.

0 Hong Tay over 8 years ago in reply to Rahul Prabhu

Expert 2465 points

Hi Rahul,

Thanks for your reply.

The EVM is AM572x Evaluation module and OS is Linux.

www.ti.com/.../tmdsevm572x

Thaks.

0 Yordan Kovachev over 8 years ago in reply to Hong Tay

TI__Guru**** 161600 points

Hi,

I am referring to the latest Linux SDK03.01.00.06 (kernel 4.4.19).
You should perform the following changes:
1. Add the uart2 pinmux settings in u-boot. The files that need to be modified are:
board/ti/am57xx/mux_data.h -> see core_padconf_array_essential_x15[] strucutre. Currently it configures UART3 as a debug terminal:
{UART3_RXD, (M14 | PIN_INPUT_PULLDOWN)}, /* uart3_rxd.gpio5_18 */
{UART3_TXD, (M14 | PIN_INPUT_PULLDOWN)}, /* uart3_txd.gpio5_19 */

Comment these and add the UART2 pins you want to use.

2. Add uart2 pinmux settings in arch/arm/dts/am57xx-beagle-x15.dts:
- change the uart3_pins_default: uart3_pins_default with the uart2 pins you want to use.
- remove the &uart3 node & add, &uart2 with the same settings.
- change
chosen {
stdout-path = &uart3;
};
to
chosen {
stdout-path = &uart2;
};

Best Regards,
Yordan

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AM572x debug UART change