Short of RAM in STM32U585 for TFM_Appli_NonSecure

[Nitin]

Hello, I am using STM32U585 TFM architecture for one of my project. Which basically is a combined project of 5 internal projects as usual TFM(mentioned below).

1. TFM_Appli_NonSecure

2. TFM_Appli_Secure

3. TFM_Loader_NonSecure

4. TFM_Loader_Secure

5. TFM_SBSFU_Boot

I have surpassed available RAM(SRAM1 of 192kb) for TFM_Appli_NonSecure project. And I am not getting any solution to this even after trying some ways like using SRAM3(mainly).

I think now I need some export opinion for increasing this availablity by minimum of 50kb

Any support any support will be appreciated.

Thanks,

Nitin

[Jocelyn RICARD · Accepted solution]

Hello Nitin,

You can use part of SRAM3 of STM32U5.

TFM uses SRAM2 and first 32K of SRAM3 as you can see in region_defs.h

#if defined(STM32U535xx) || defined(STM32U545xx)
#define S_TOTAL_RAM_SIZE        (_SRAM2_SIZE_MAX) /*! size require for Secure part */
#else
#define SRAM3_S_SIZE            0x8000                           /* 32Kbytes */
#define S_TOTAL_RAM_SIZE        (_SRAM2_SIZE_MAX + SRAM3_S_SIZE ) /*! size require for Secure part */
#endif /* defined(STM32U535xx) || defined(STM32U545xx) */

So, you can add a region in your non secure linker file starting from SRAM start + 32K until SRAM end.

Then you will need to allocate part of your data in this area

Best regards

Jocelyn

[Nitin]

Hi Jocelyn, thanks for quick support.

I have tried changing MEMORY region like below.

MEMORY

{

FLASH (rx) : ORIGIN = NS_CODE_START, LENGTH = NS_CODE_SIZE

RAM (rwx) : ORIGIN = _SRAM3_BASE_NS + 0x8400, LENGTH = 0X3C800

/*RAM (rwx) : ORIGIN = NS_DATA_START, LENGTH = NS_DATA_SIZE*/

}

And I have got compilation error as,

If it is because I have not performed "you will need to allocate..

part of your data in this area" I have to try this as I am not expert in LD files.

If issue is something else kindly advice me.

Thanks in advance.

[Nitin]

Hi Jose, by getting some understanding of linker script I made it work. Thanks to your guidance in above reply. You are amazing as always:)