topic Re: Backdoor access key implementation in S32K116 in S32K

Backdoor access key implementation in S32K116

prabhatg44 — Sun, 04 Jul 2021 18:01:53 GMT

Thanks for the code, I was trying to set the Backdoor access key by modifying steps in startup_S32K116.s file as below to set FSEC register:

BackDoorK0 EQU 0x10
BackDoorK1 EQU 0x32
BackDoorK2 EQU 0x54
BackDoorK3 EQU 0x76
BackDoorK4 EQU 0x98
BackDoorK5 EQU 0xBA
BackDoorK6 EQU 0xDC
BackDoorK7 EQU 0xFE

; <3=> Backdoor key access disabled
; <i> Backdoor Key Security Enable
FSEC EQU 0xBE

But not able to see BF value in the debugger. Can you please support me in this regards.

Re: Backdoor access key implementation in S32K116

danielmartynek — Wed, 07 Jul 2021 08:57:53 GMT

Hi @prabhatg44,

I'm not familiar with this version of startup_S32K116.S, what IDE do you use?

Can you check the memory at 0x400?

Thank you,

BR, Daniel

Re: Backdoor access key implementation in S32K116

prabhatg44 — Wed, 07 Jul 2021 12:35:22 GMT

I am using KEIL IDE. On 0x00value I am having is in the figure below also sharing my startup_S32K116.s file used by me. Not able to see BF value in the debugger. Can you please support me in this regards

Re: Backdoor access key implementation in S32K116

danielmartynek — Thu, 08 Jul 2021 13:13:46 GMT

Hello @prabhatg44,

The linker file seems to be correct but it looks like it hasn't been loaded to the MCU.

Unfortunately, we don't use KEIL so I can't test it.

I would recommend contacting KEIL support.

Regards,

Daniel