MCU-PLUS-SDK-AM243X: JTAG Control

Hao Wang

Prodigy 145 points

Part Number: MCU-PLUS-SDK-AM243X

Tool/software:

I am testing the sample programs on AM243x EVM board.

I will make sure the questions on firmware downloading by JTAG.

When we use CCS to download firmware from JTAG port, e.g. Hello World, is it written to AM243x RAM or external flash?

It seemed to write to flash, because if run the program, we need to set SPI boot mode to boot from flash.

Can we implement to write the program to RAM by JTAG?

Thanks.

10 months ago

0 Tushar Thakur 10 months ago

TI__Guru 50518 points

Hello Hao,

Thanks for your query.

Hao Wang said:
When we use CCS to download firmware from JTAG port, e.g. Hello World, is it written to AM243x RAM or external flash?

When you load the binary from JTAG using CCS, it is written to the SoC RAM. You will need to reload the binary every time when you power cycle.

Hao Wang said:
It seemed to write to flash, because if run the program, we need to set SPI boot mode to boot from flash.

The application you are referring here seems to be SBL binaries which is written to the flash and does not need to re-write each time the SOC is power cycled.

Regards,

Tushar

0 Hao Wang 10 months ago in reply to Tushar Thakur

TI__Prodigy 145 points

Tushar

Thanks for reply.

You are correct. I have verified the SBL binaries is loaded to flash.

In my board, there is no flash.

I need to load the binary program to soc RAM.

There are descriptions in SDK manual for loading the binary by USB DFU.

Do you know how to load to RAM by JTAG in CCS?

It will help me a lot.

Thanks.

Thanks & Best regards

Hao (Wang hao)

+1 Tushar Thakur 10 months ago in reply to Hao Wang

TI__Guru 50518 points

Hi Hao,

Hao Wang said:
Do you know how to load to RAM by JTAG in CCS?

You can keep the board in NO/DEV boot mode depend on the device type.

If you are using GP EVM, keep the board in NO Boot otherwise in DEV boot mode.

After changing the appropriate boot mode, follow the steps mentioned at EVM_SOC_INIT_CCS

Regards,

Tushar

0 Hao Wang 10 months ago in reply to Tushar Thakur

TI__Prodigy 145 points

Tushar

This resolved my question.

Thanks.

Thanks & Best regards

Hao (Wang hao)

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MCU-PLUS-SDK-AM243X: JTAG Control