FLASH security configuration

Sourdev — Wed, 12 Jul 2023 04:38:22 GMT

Hi,

I am using S9KEAZN64AMLC MCU (Custom Board). I want to secure the FLASH After Flashing.

and again when I got the request over LIN or any other external request then I had to Unsecure,

Is there any way to do that?

I went through the start-up code. If we change the value from FE to FD is flash will secure?

Can we do that if I want to change this configuration in run time?

I tried the following

When any request comes from an external environment I am calling this function to unlock the FLASH but when control comes here it is going to default to ISR. Is it the right way to do that?

If not how we can lock and unlock FLASH in RUN time?

And if FLASH is locked and unable to unlock then how we can do MASS Erase? (NOTE: I am using S32DS IDE and PE Micro Multilink Universal )

Re: FLASH security configuration

Robin_Shen — Thu, 13 Jul 2023 03:03:41 GMT

Please read 18.3.6 Protection of KEA64RM. If you change the value of Flash Configuration from FE to FD, the flash will secure. 0x40E is the address of Flash security byte. FTMRH_FSEC[SEC]=01 mean Secured. Refer to 18.4.2 Flash Security Register (FTMRH_FSEC).

Recommended you refer to 18.3.7.1 Unsecuring the MCU using backdoor key access after you got the request over LIN or any other external request.

Best Regards,
Robin
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topic Re: FLASH security configuration in S32K

FLASH security configuration

Re: FLASH security configuration