LP-AM261: Decoupling of HSMRT Reboot loop

Nithin Kurian

Prodigy 130 points

Part Number: LP-AM261
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi,

I am currently experimenting with the Secure Boot related functionalities.

I was trying to load HSMRT from flash.

I have tried sbl_ospi_fastboot example, it executes as expected. It jumps to the application running properly

But when i tried to do the same in out sbl, the behavior is not as expected

From SBL it jumps to application, but then it reboots.

Then this repeat.

Could you please provide some insights on how to proceed further

3 months ago

0 Nilabh Anand 3 months ago

TI__Mastermind 48760 points

Hi Nithin,

Nithin Kurian said:
But when i tried to do the same in out sbl, the behavior is not as expected

Are you using your custom SBL?

0 Nithin Kurian 3 months ago in reply to Nilabh Anand

Prodigy 130 points

Nilabh Anand said:
Are you using your custom SBL?

Modified version of SBL OSPI

0 Nilabh Anand 3 months ago in reply to Nithin Kurian

TI__Mastermind 48760 points

Hi NIthin,

The two sbl SBL OSPI and SBL Fastboot are fundamentally different, in the way they are implemented.

The modified SBL that you are trying to use, is it based on the SBL fastboot, if not please repurpose the SBL fast boot example from SDK to adopt to your custom implementation.

0 Nithin Kurian 3 months ago in reply to Nilabh Anand

Prodigy 130 points

Hi Nilabh,

Thank you for the response.

Nilabh Anand said:
not please repurpose the SBL fast boot example from SDK to adopt to your custom implementation.

I will try implementing the changes in SBL fast boot example.

But I have a doubt.

I have already tried modifying the sysconfig of fast boot example to be same as our customized SBL. And in that scenario still the modified fast boot example works.

So my first question is what is the difference between SBL ospi and fast boot other than sysconfig changes. Ofcouse, changes in main file and sysconfig related system generated file changes are expected. Other than that is there any other changes.

My second question is

Nithin Kurian said:
From SBL it jumps to application, but then it reboots

From SBL it jumps to application. After reaching application it reboots. So it really due to some missing changes in SBL? Is there a scenario by which this can happen? Or what could be the possibile reasons