TMS320F28374D: GSx RAM access fail when DCSM locked

Tyler Tseng

Prodigy 110 points

Part Number: TMS320F28374D

Hi,

In our application we set CPU2 as GS11 RAM master , the scenario is a a global variable is updated

by CPU2 in this region and CPU1 read it, we found that when DCSM is password locked, CPU1 will read

incorrect value but if we unlocked DCSM in CPU2 everything seems OK, GSx RAM should be

non-secure memory, why we need to do that ?

over 7 years ago

0 Vivek Singh over 7 years ago

TI__Guru** 116981 points

Hi Tyler,

Yes, GSx RAMs are non-secure memories hence security should not have any impact on these RAMs. Security is enabled for only CPU1 or CPU1 and CPU2 both. Could it be possible that CPU2 is not working as expected when security is enabled hence the RAM location is not getting updated properly by CPU2 ? Can you confirm that CPU2 code is working fine?

Regards,

Vivek Singh

0 Vivek Singh over 7 years ago in reply to Vivek Singh

TI__Guru** 116981 points

Tyler, any update on this?

0 Tyler Tseng over 7 years ago in reply to Vivek Singh

Prodigy 110 points

Hi Vivek,

We have checked CPU2 program and it actually not run well as expected because of memory security issue

itself, the GSxRAM access between two CPUs is OK, the root cause is program cannot output valid data,

thanks for your comment, it indeed gave us clue to investigate this.

0 Vivek Singh over 7 years ago in reply to Tyler Tseng

TI__Guru** 116981 points

Tyler,

Thank you for the update.

Vivek Singh

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28374D: GSx RAM access fail when DCSM locked