AM263P4: SBL Size

Hi Kier,

Kier said:

How much OCRAM memory does sbl_ospi.release.tiimage actually use on execution please?

It would depend on the functionality you would be using;

For example if you are opting for the fast boot: AM263Px MCU+ SDK: Achieving Fast Secure Boot and Boot time calculator

then keeping 256KiB is necessary due to streaming service.

But I would recommend having 256KiB minimum for SBL.

Also If you are looking for a way to monitor memory usage of SBL at runtime, you could fill the entire memory range with a certain value (using the fill directive in the linker command file - please see the Assembly Language Tools Users Guide for more details), and then view the memory at runtime (using memory browser) to determine how much of it has been used. The .stack section is usually the section in RAM that can vary in size based on your application's needs. 

Link

Useful info thank you Nilabh but I'm only talking about your SBL 'sbl_ospi.release.tiimage' already built by TI located here:

C:\ti\mcu_plus_sdk_am263px_09_02_00_56\examples\drivers\boot\sbl_ospi\am263px-cc\r5fss0-0_nortos\ti-arm-clang

I don't wish to build my own.

Having said that, I think I found the answer in the .map file located in the above directory. Sorry I should have looked harder. Anyway, it looks like your SBL uses about 216KiB.

Just one remaining question: The load origin of the SBL is 7000 2000 according to the map file but the standard memory region in the TI application examples starts at 0x7000 0000:

<Question> Can I change the above SBL Start Address to 0x7000 2000 and use region 0x7000 0000 to 7000 1FFF for application?

Glad to know you were able to find the info.

Kier said:

Just one remaining question: The load origin of the SBL is 7000 2000 according to the map file but the standard memory region in the TI application examples starts at 0x7000 0000:

Tis cannot be changed as ROM expects SBL at this location. ROM Boot Flow in AM26x devices (ti.com)