AWR6843: Is it possible to change dss firmware in run-time

Chris Meng

Part Number: AWR6843

Hi,

My customer wants to support two applications on AWR6843, let's say APP1/APP2. These two APPs will not run at same time. That is, only one APP is running at one time.

Due to the memory limitation and porting effort, customer thought if they can change the dss firmware in run-time. BTW, customer can't reset MSS.

Bellow are some items I thought we need to take care if changing dss firmware in run-time. Pls kindly help to check and give your comment.

1. If DPM is used, MSS needs to call DPM_deinit before dss firmware change, and run DPM_init after dss firware change done.

2. What's the right flow to reload dss firmware? Shall we need to halt DSS and how? If we can halt DSS, I think we need to clean the dss interrupt vector table and reset DSS. Then use mms to copy the new APP firmware. Then reset DSS to let it run. Or not need to halt dss, but just clean the dss interrupt vector table and reset DSS?

If I miss anything, pls kindly advise.

over 4 years ago

0 Vaibhav Mahimkar over 4 years ago

TI__Mastermind 23725 points

Hello

Trying to understand the need better here. How would the application know which is the right code to use?

In case the MSS application is aware of the context then can it be used to load the appropriate image at boot location and issue a reboot?

Thank you,

Vaibhav

0 Chris Meng over 4 years ago in reply to Vaibhav Mahimkar

TI__Mastermind 37736 points

Vaibhav,

MSS will get external message to know which app need to run. In customer’s use case, MSS can’t reset or reboot.

0 Yogesh Siraswar over 4 years ago in reply to Chris Meng

TI__Mastermind 20745 points

Chris,

It should theoretically be possible. You may need to create a secondary boot loader kind of application for DSS.

The application code will bring in the new DSS application in the memory and do either

1) A DSS (GEM) reset to execute the new code in the memory

2) Reset the vector table and set the PC to _c_int00 of the new DSS application.

It may require placement of memory and debugging to get one of the above to work.

You may look at C674 secondary boot loader for reference.

Thanks

Yogesh

0 Chris Meng over 4 years ago in reply to Yogesh Siraswar

TI__Mastermind 37736 points

Yogesh,

Thanks for your reply.

Would you pls kindly advise where I can find info of C674 secondary boot loader?

0 Yogesh Siraswar over 4 years ago in reply to Chris Meng

TI__Mastermind 20745 points

Hi Chris,

Please refer following document:

https://www.ti.com/lit/an/spraat2f/spraat2f.pdf

Thanks

Yogesh

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AWR6843: Is it possible to change dss firmware in run-time