S32K146: after enable secure boot, first powercycle will get secure boot failed (FCSESTAT->BOK==0)

baichuan — Fri, 04 Nov 2022 09:51:34 GMT

like the subject said,

1. called CSEC_DRV_BootDefine(0x14000 * 8, CSEC_BOOT_SERIAL) to enable secure boot.

2. powercycle to let chip calculate BOOT_MAC and load it to CSEc automatically and stay in bootloader.

3. powercycle again to see uartlog to check register FCSESTAT->BOK, the value is 0, secure boot failed.

4. But when I restart it again, uartlog shows register FCSESTAT->BOK == 1, secure boot success.

it didn't happen in S32DS debug. I want to know what caused this problem? How to resolve it?

J-FLASH version: 6.88

Thanks

Re: S32K146: after enable secure boot, first powercycle will get secure boot failed (FCSESTAT->BO

lukaszadrapa — Mon, 07 Nov 2022 11:40:28 GMT

Hi,

this works as expected on my side, I can't see any issues. The BOK is set as expected right after second reset or power cycle (I tested both).

What is the time between the power cycles? Isn't that some extremely short period?

Regards,

Lukas