S32 Design StudioのトピックRe: CSEC memory allocation problem

CSEC memory allocation problem

ZEROOO — Mon, 21 Aug 2023 08:02:32 GMT

I have a CSEC memory allocation problem, when I partition flexram, there is a 2kb eeprom, and the size allocated to csec is 512byte, I have a 2kb area in RAM as the mirror area of the 2kb eeprom, the problem is that csec takes up 512 bytes of space. This part is not visible, do I need to allocate image ram to this 512 bytes?

Re: CSEC memory allocation problem

jiri_kral — Mon, 21 Aug 2023 09:21:19 GMT

Hi,

what's your target device?

Re: CSEC memory allocation problem

ZEROOO — Mon, 21 Aug 2023 09:35:53 GMT

Hi @jiri_kral

I used an S32k118.I wonder if I can save the 512 bytes of RAM.

Re: CSEC memory allocation problem

jiri_kral — Mon, 21 Aug 2023 13:59:24 GMT

As I understad it - with CSEC module the FlexRAM is used as an Emulated EEPROM - where part is taken for keys (up to 20 keys and up to 512 bytes - based on FCCOB1 register content).

Remaining memory space can be used as regular Emulated EEPROM. You don't need to create your custom mirror of this area and in can be accessed directly (at least that's how I understand it from Reference Manual).