TDA4VM-Q1: uboot spl: Serial Print in Advance

xie jc

Part Number: TDA4VM-Q1

Hi, TI engineers,

Due to debugging requirements, we would like to enable the serial port in SPL (Secondary Program Loader) earlier. We have identified that the serial port enabling is located inside the preloader_console_init() function in the j721e_init.c file. We intend to print some of the SCI transmission processes within SPL and would like to move the serial port initialization before the spl_early_init function or as early as possible. How can we make this modification?

sdk: 08_06

Regards,

Tahm

over 2 years ago

0 Keerthy J over 2 years ago

TI__Guru**** 169100 points

Hi Tahm,

It would be more involved. You will need to make sure that the clocks/module are turned on before you introduce the preloader_console_init.
Recommend using a JTAG to debug without prints.

- Keerthy

0 xie jc over 2 years ago in reply to Keerthy J

Expert 2420 points

Hi, Keerthy,

using JTAG to debug maybe a better way.

by the way, i found a file debug_uart.h in u-boot, do you know how to use this function, i enable some configure in defconfig file,

but still can not figure out what exactly i should do to make it work.

Regards.

Tahm

0 Keerthy J over 2 years ago in reply to xie jc

TI__Guru**** 169100 points

Hi Tahm,

This will not be able to get the prints before preloader_console_init if that is what you intend to do.
We have not explored this path.

- Keerthy

0 xie jc over 2 years ago in reply to Keerthy J

Expert 2420 points

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TDA4VM-Q1: uboot spl: Serial Print in Advance