TMS320F280049C: FlashAPI with DCSM

Wolfgang Burger

Hi All,

we want to enable DCSM for our controller after the development-phase but I encountered some problems regarding the FlashAPI.

As far as I understand the FlashAPI can be used from ROM or linked additionally to the Flash using the provided libraries.

Since we are using a custom Bootloader on the device we are currently using the FlashAPI from ROM since it does not need any additional Flash memory and of course the Bootloader should be as small as possible. Now after trying to enable the DCSM I realized that the FlashAPI from ROM cannot program the Flash anymore since the ROM is not part of the secure memory. So is our only choice to use the library and include it in the Flash memory and most probably loose one additional sector to the bootloader since the FlashAPI needs around 1.5k memory?

Best regards

Wolfgang

over 4 years ago

0 Vamsi Gudivada over 4 years ago

TI__Guru* 87155 points

Wolfgang,

Yes, the flash API is not in secure ROM space. Hence, please include the flash API in your application in the same security zone that you want to use it for.

Thanks and regards,
Vamsi

0 Wolfgang Burger over 4 years ago in reply to Vamsi Gudivada

Prodigy 220 points

Hi Vamsi,

that's unfortunate but thanks already.

Is there another restriction I cannot see yet regarding the secure memory considering all flash sectors and LS memory blocks are within Zone 1 of the DCSM? Does it affect the CLA in any way? Of course I know that I cannot execute Code in global shared memory.

As far as I see the FAST-library is part of the Secure ROM so there should be no impact on this. Apart from that the content of the Boot ROM seems to be only data which will be used but nothing else which is executed right?

Best regards

Wolfgang

0 Vamsi Gudivada over 4 years ago in reply to Wolfgang Burger

TI__Guru* 87155 points

Wolfgang,

I will assign this post to our security expert to help you further.

Thanks and regards,
Vamsi

0 Vivek Singh over 4 years ago in reply to Wolfgang Burger

TI__Guru** 116041 points

Wolfgang Burger said:
Is there another restriction I cannot see yet regarding the secure memory considering all flash sectors and LS memory blocks are within Zone 1 of the DCSM? Does it affect the CLA in any way?

CLA behavior is like CPU only. CLA task can run from secure or unsecure memory and all access filter (protection) rules apply to CLA like CPU. Task running from unsecure RAM can not access data from secure RAM.

Regards,

Vivek Singh

0 Wolfgang Burger over 4 years ago in reply to Vivek Singh

Prodigy 220 points

Hi Vivek,

Regarding the second question in my previous post: is there another library affected by the DCSM like the FlashAPi?

Best regards

Wolfgang

0 Vivek Singh over 4 years ago in reply to Wolfgang Burger

TI__Guru** 116041 points

Hi,

Can you please tell specific library name ? It is difficult to make generic comment about security.

Regards,

Vivek Singh

C2000™︎ microcontrollers

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TMS320F280049C: FlashAPI with DCSM