AM2632: Calibration section to be extracted from Application File

Nidhi Adk

Part Number: AM2632

Tool/software:

Controller: Sitara - AM263x + External Flash

Need some support on Calibration section/tuning/Flashing part, here are the details:

>> From the whole compiled Application.Hex , want to extract a particular CALIB section - only to have Calibratable parameters in it (Section will be defined in Linker file) and make it new CALIB.Hex

>> Once the CALIB.Hex is extracted, we want to tune the values of the parameters using one Vector Tool, so to have different files for different variants.

As per above points, I made some changes in Linker file to have a dedicated section(64K) by considering OCRAM area given less ROM area for this controller as below in existing TI Linker file and I am able to have my parameters in that defined address range.

.map file after successful compilation:

But this section of area is not part of compiled Application.Hex, so I couldn’t extract this defined section from compiled Hex file for Calibration tuning using Vector Tool.

>> It is not part of Application.Hex as the area defined in Linker is of OCRAM ?

>> If my CALIB section to be part of Application.Hex , my section configuration in Linker to be only ROM area?

Thanks !

3 months ago

0 Nilabh Anand 3 months ago

TI__Mastermind 44544 points

Hi Nidhi,

Nidhi Adk said:
From the whole compiled Application.Hex , want to extract a particular CALIB section - only to have Calibratable parameters in it (Section will be defined in Linker file) and make it new CALIB.Hex

This is not possible as, the whole application is compiler and then signed, there is no way to extract is until the application is autheticated by SBL and HSM-RT

Please not my answer is in reference to HSSE(security enforced) production device which you would deploy in field.

0 Nilabh Anand 3 months ago in reply to Nilabh Anand

TI__Mastermind 44544 points

Please refer to these two threads which have asked same question as yours:

(+) AM263P4: How To "Update The Calibration"? - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

(+) AM263P4: Secure Boot: individual calibration section flashing - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

0 Nidhi Adk 3 months ago in reply to Nilabh Anand

Prodigy 30 points

[deleted]

0 Nidhi Adk 3 months ago in reply to Nidhi Adk

Prodigy 30 points

Hi Nilabh,

Thanks for the reply with the Links, my question is more or less like the first link you shared (How to Update the Calibration).

Here, I want a dedicated 64K, and that 64K should be part of my compiled Hex file which goes into External Flash.

I made a section in Linker file(by going through Hex file below) and considered the area which has filled with ‘0xFF’(guessing that’s unused) as below:

But once compiled, though I am able to see the area in Hex as well the in the Vector tool, but the data is still assigned with “FF” rather than the data assigned in code part.

Is there some other configuration I should be doing apart from Linker changes?

Thanks!

0 Nilabh Anand 3 months ago in reply to Nidhi Adk

TI__Mastermind 44544 points

After discussion over call, EEPROM would be a better option.

+1 Nidhi Adk 3 months ago in reply to Nilabh Anand

Prodigy 30 points

Thanks, TI Team, for joining the call and sharing the input.

Due to size limitations, EEPROM isn't a viable option for us.

Planning on custom implementation by having two linker files for Application & Calibration , exploring DSECT linker command for the same and closing this conversation.