J721EXSOMXEVM: CCS and SBL Applications

Arun Belamge

Part Number: J721EXSOMXEVM

Tool/software:

Hello All.

I have few questions regarding CCS and SBL for the MCU Domain Cortex R5F core.

1. I was successfully able to setup and run the launch.js script in CCS. But when I try to run the Hello World example, on the mcu1_0 core, I see the debug assembly code, but the printf output is not seen anywhere. I tried the MCU UART terminal, as well as the CIO Console (used fflush(stdout) too). Where is the output and debug information being redirected?

2. I want to run a baremetal app on the main R5F core on the MCU domain i.e., mcu1_0. I am not very clear about the SCIClient app that needs to be run on the main R5F core. Should I include SCI with my application, or is it already initialized by the SBL? (do note that i am running a baremetal app i.e., non-os)

3. Can the application developed on CCS IDE be used for SBL baremetal, or how to port the CCS app to baremetal SBL?

Thanks in advance.

6 months ago

0 Suman Anna 6 months ago

TI__Guru** 113435 points

Hi Arun,

Responses will be delayed owing to the Good Friday/Easter holidays across TI.

regards

Suman

0 Neehar Sawant 5 months ago in reply to Suman Anna

TI__Mastermind 20630 points

Hi Arun,

Arun Belamge said:
I want to run a baremetal app on the main R5F core on the MCU domain i.e., mcu1_0

Is this a custom board or TI EVM? Can you please double check and ensure you have connected the UART to MCU UART? Additionally, can you please double check the UART settings in CCS and ensure they match these specifications?

Arun Belamge said:
I want to run a baremetal app on the main R5F core on the MCU domain i.e., mcu1_0

Can you confirm you want to run the application on MCU1_0? This is a MCU R5F core and not main R5F core so I want to clarify which core you want to run on.

Arun Belamge said:
Should I include SCI with my application, or is it already initialized by the SBL? (do note that i am running a baremetal app i.e., non-os)

If indeed you are running for MCU1_0, regardless of if the application is FreeRTOS or baremetal, if you are using the makefile from the PDK, it will automatically handle loading the sciserver appimage onto the core.

Arun Belamge said:
Can the application developed on CCS IDE be used for SBL baremetal, or how to port the CCS app to baremetal SBL?

If you do develop using the CCS IDE, we do not support building the project or application within CCS. You will have to build the application within the PDK specifically for baremetal environment.

Thanks,

Neehar

0 Suman Anna 5 months ago

TI__Guru** 113435 points

Hi Arun,

Arun Belamge said:
I want to run a baremetal app on the main R5F core on the MCU domain i.e., mcu1_0.

You can run baremetal application on MAIN R5F cores, but not on the MCU R5F in an integrated product.

The SciServer that needs to run on MCU1_0 to provide Device Management services needs an RTOS.

regards

Suman

0 Arun Belamge 5 months ago in reply to Suman Anna

Prodigy 110 points

Hi Suman.

Neehar Sawant said:
If indeed you are running for MCU1_0, regardless of if the application is FreeRTOS or baremetal, if you are using the makefile from the PDK, it will automatically handle loading the sciserver appimage onto the core.

and

Suman Anna said:
You can run baremetal application on MAIN R5F cores, but not on the MCU R5F in an integrated product.

Im now confused as to whether I can run baremetal app on mcu1_0 or not? I am targeting the MCU domain specifically and the application I will be using is baremetal.

Thank you.

0 Arun Belamge 5 months ago in reply to Neehar Sawant

Prodigy 110 points

Hi Neehar.

Neehar Sawant said:
Is this a custom board or TI EVM? Can you please double check and ensure you have connected the UART to MCU UART? Additionally, can you please double check the UART settings in CCS and ensure they match these specifications?

It is TI EVM - J721E_EVM. Yes, I have connected MCU UART. The UART settings are correct, I have verified.

Neehar Sawant said:
Can you confirm you want to run the application on MCU1_0? This is a MCU R5F core and not main R5F core so I want to clarify which core you want to run on.

Yes, I want to run the application on MCU1_0 (MCU Domain R5F Core 0), i meant "main" as in core 0 of MCU R5F Subsystem, my bad on that.

Thank you.

+1 Neehar Sawant 5 months ago in reply to Arun Belamge

TI__Mastermind 20630 points

Hi Arun,

Arun Belamge said:
Im now confused as to whether I can run baremetal app on mcu1_0 or not? I am targeting the MCU domain specifically and the application I will be using is baremetal.

To clarify, if you are running a basic or simple baremetal binary, for example for unit testing, that runs on mcu1_0 it is okay.

For more complex, multi-core applications and for your final application in production, you will not be able to run baremetal code on mcu1_0 or else you will run into issues with the Device Management which handles the following:

System Controller Interface Server (SCISERVER)
Resource Management (RM) Services
Power Management (PM) Services

You can take a look at more information here. Sciserver, from above list, is required for majority of functionality of our device and requires an RTOS to run.

Arun Belamge said:
It is TI EVM - J721E_EVM. Yes, I have connected MCU UART. The UART settings are correct, I have verified.

Have you tested with any of the example applications or binaries within the PDK? Are you able to see logs from any of those? There are many examples which show how to setup the UART for logs on the EVM.

Thanks,

Neehar

0 Arun Belamge 5 months ago in reply to Neehar Sawant

Prodigy 110 points

Hi Neehar.

Thanks for the response, and i pretty much got an idea about running my application.

I no longer require CCS as I was successfully able to execute a custom hello_world app on mcu1_0 using PDK and its makefile infra following this FAQ [FAQ] TDA4VM: How to build custom examples in PDK - Processors forum - Processors - TI E2E support forums.

Will create a new thread if I face any issues building my app in PDK.

Thank you!