Flash programming with flash security not possible

[peterkrause]

Hello.

I activated the flash security option on my Kinetis K10. But CoreWarrior doesn't program the MCU with the correct setting. I always get the following error:

CodeWarrior changes the security option to unsecure setting and programs the flash.

I cant' find an option to change the current configuration to support the enabled sucurity feature. How can I enable it?

[ZhangJennie]

Hi Peter.

how did you set FSEC register?

Best Regards.

ZhangJun

[peterkrause]

Hello.

I set the FSEC register in the start-up code.

/* Flash configuration field */ 

__attribute__ ((section (".cfmconfig"))) const uint8_t _cfm[0x10] =

{ 

        /* NV_BACKKEY3: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY2: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY1: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY0: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY7: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY6: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY5: KEY=0xFF */ 

        0xFFU, 

        /* NV_BACKKEY4: KEY=0xFF */ 

        0xFFU, 

        /* NV_FPROT3: PROT=0xFF */ 

        0xFFU, 

        /* NV_FPROT2: PROT=0xFF */ 

        0xFFU, 

        /* NV_FPROT1: PROT=0xFF */ 

        0xFFU, 

        /* NV_FPROT0: PROT=0xFF */ 

        0xFFU,

#if SECURITY_ENABLED

        /* NV_FSEC: KEYEN=1, MEEN=3, FSLACC=3, SEC= 2 or 3 */

        0x7CU,

#else

        0x7EU,

#endif

        /* NV_FOPT: ??=1, ??=1, ??=1, ??=1, ??=1, NMI_DIS=1, EZPORT_DIS=1, LPBOOT= 0 or 1 */

#if LP_BOOT_MODE_ENABLED 

        0xFEU,

#else

        0xFFU,

#endif

        /* NV_FEPROT: EPROT=0xFF */ 

        0xFFU, 

        /* NV_FDPROT: DPROT=0xFF */ 

        0xFFU 

};

[peterkrause]

Has nobody an idea?

[ZhangJennie]

Hi Peter,

there is many Conditional Compilation in your code. what is the ultimate FSEC value you used?

Best Regards,

Jennie

[peterkrause]

Hello Jennie,

my final value for FSEC is 0x7C to secure the flash.

Best regards

Peter Krause

[ZhangJennie]

hello Peter.

I don't have K10 board, but i just made sample on k20 twr board, set FSEC is 0x7C, i can't see your problem. there is no issue to download. secure feature can work normal.
I attached my demo code made with processor expert.

can it also work for you?

==================================

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Best Regards,

Zhang Jun

[peterkrause]

Hello Jennie,

it still doesn’t work for me when I hit the run or download button in CodeWarrior. Maybe it depends on the debugger hardware? I’m using a Segger J-Link.

But I tried another way to download the code.

I created a target task for the flash programmer. By this way I was able to download the code. How can I verify that my MCU is secured properly? On which way did you try to download the code to the MCU?

Best Regards

Peter Krause

[ZhangJennie]

hello Peter.

if chip gets sucured, next time when connects board, debugger will pop up confirm message "Device is secure,...".

I use OSJTAG interface. I currently don't have J-link interface, can you please try P&E Multilink or OSJTAG ? how does it work?
and how did you solve your problem currently?

==================================

this answer is for you. if it helps, please click on "Correct Answer" button. thanks!

Best Regards,

Zhang Jun

[peterkrause]

Hello Jennie,

I don’t get the confirm message when running the debugger. So I think securing also doesn’t work when using target task for flashing the MCU.

I can’t test the other debugging devices because I only have the J-Link.

The problem seems to be the debugger and its software. In the following forum thread Segger confirms that they check it before downloading:

http://forum.segger.com/index.php?page=Thread&threadID=892

And here is a solution to fix the problem:

http://mcuoneclipse.com/2014/06/22/preventing-reverse-engineering-enabling-flash-security/

But he is using Kinetis Design Studio. I can’t find an “allow security” configuration file for my MCU in CodeWarrior.

How can I enable it in CodeWarrior or which file I have edit to allow security with my J-Link?