topic Re: Code Read Protection (CRP) on MK64F512x issue in Kinetis Microcontrollers

Code Read Protection (CRP) on MK64F512x issue

chhsu0229 — Fri, 30 Apr 2021 01:53:24 GMT

how can I work Code Read Protection (CRD) on MK64f512x.

I am work on MK64F512x Code Read Protection (CPR) as CRP_1 code protection. It should be not accessible read code by JTAG after setting the value 0x12345678 (CRP1 lever ) on flash addreee 0x2FC.

However, the result is not true and it sill is accessible to be read with JTAG..

I added the following code in main.c on my projector

The JTAG still can read flash of MK64F512x data.

#include <NXP/crp.h>
// Variable to store CRP value in. Will be placed automatically
// by the linker when "Enable Code Read Protect" selected.
// See crp.h header for more information

__CRP const uint32_t CRP_WORD = CRP_CRP1;

I also read the 0x2FC address and value is 0x12345678. This value is the same as #define CRP_CRP1 0x12345678

Thanks

Re: Code Read Protection (CRP) on MK64F512x issue

Robin_Shen — Thu, 06 May 2021 09:23:09 GMT

Hi chhsu0229,

Sorry for the delay!
You can refer the discussion in: flash is secured but flash config field is not
FSEC[SEC] is able to achieve this function.

If you are using MCUXpresso SDK, then you can modify the configuration in FlashConfig of startup_mk64f12.c.

Best Regards,
Robin
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