[SOLVED] STM32L151RE - JFlash / Autoprogram with SecureChip don't boots target

DerThomaLudwig · Aug 19th 2015, 10:45am

Hi all,

we have a problem with our taget board to secure the chip after flashing.
1. Try
The target will be flashed from the commandline-option with succes and boots. Afterwards we secure the chip with JFlash.
The target stalls and never comes up again, even after a reset at NJRST-pin.
2.Try
AutoProgram with JFlash
SecureChip plus start application is enabled, but target never boots...
Note: The target is powered all the time (!) by a HLC Hybrid Capasitor Layer, so a real POR will not be performed.
If we disconnect the power, what we won't do for production, the target starts again !

Question:
- Is there a possibility (function) in the commandline (script)-version to do that (SecureChip) ?
- With JFlash-GUI-version, what can the reason for a non booting target ?
- Is always a real POR-reset needed for stable boot up ?

Thanks in advance

STM32L151RE
JFlash 5.00g
JLink Plus v9.3

SEGGER - Roman · Sep 1st 2015, 5:13pm

Hello,

- Is there a possibility (function) in the commandline (script)-version to do that (SecureChip) ?
Yes, command line option "-securechip"

- With JFlash-GUI-version, what can the reason for a non booting target ?
- Is always a real POR-reset needed for stable boot up ?
After setting the STM32's read protection every memory read request generates a bus error. This is what happens if the "Secure chip" option is used, the read protection is set immediately and a Power-on-reset is needed to start the application. We support a great number of different devices with different behaviors and so we must discuss internally if there will be made corresponding changes.

For now we recommend to set the read protection within the firmware or using the exit steps.
For using the exit steps please refer to the JFlash manual ch. 4.1.3.8

Best regards,
Roman

SEGGER - Roman · Sep 1st 2015, 5:26pm

Would you like to be added to the J-Link software update notification list,

so you get informed automatically when the new version becomes available?

DerThomaLudwig · Oct 28th 2015, 10:37am

Thank you for your response.

Yes, please add that to your J-Link update notification list.

In the script-version, what levels of "secure-chip" are supported ? (STM32L151RE)
Level 1 only I think... !

Level 2 with full security (irreversible) only inside code ...?!

Best regards

SEGGER - Niklas · Oct 29th 2015, 10:42am

Hi,

In the script-version, what levels of "secure-chip" are supported ? (STM32L151RE)
Level 1 only I think... !

Correct. Irreversible (level2) security can be set using the exit steps that were mentioned by Roman.

Yes, please add that to your J-Link update notification list.

Done.

Best regards,
Niklas

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