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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32

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Openocd STLink reset not working

Posted by Rabbe on 2018-09-01 23:16

Hi, I am trying to debug my STM32F765VGT6 micro controller.

Therefore, I connected the SWDIO, SWCLK, GND and VCC to a STLink V2 adapter.

Now, I can use “st-flash” to flash programs to the STM32, but OpenOCD does not work:

Open On-Chip Debugger
> reset halt
timed out while waiting for target halted
TARGET: stm32f7x.cpu - Not halted
in procedure 'reset'
in procedure 'ocd_bouncer'

How do I have to change my openocd.cfg to allow resetting the controller?

Note that NRST is currently hard-wired to VCC.
Nevertheless, “st-flash reset” successfully restarts the MC, so resetting has to work somehow...

stm32f7x_stlink.cfg (423 b)
Reads: 11034
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Posted by LaurentL on 2018-09-03 10:31

Hello,

If you didn’t connect the Reset line, you will need to use the correct reset settings, like this one:
reset_config none separate

The st-flash reset is maybe a “software system reset” so it is not using the reset line of stlink.

Rgds,
Laurent

Link

Posted by Rabbe on 2018-09-05 18:38

Hi,

thank you @LaurentL for your answer.

How should the electrical circuit look like, if I wanna use a reset-button and a pin, to connect the micro controller reset with the StLink adapter?

Thanks for your help :-D

kind of regards
Rabbe

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Posted by bluenow on 2018-09-05 23:35

In most of cases, the CPU /reset pin/signal work as OC-ored logic, so the pull down will effectively reset the CPU core; It usually be pulled up through a resister to VCC; DO NOT directly connect it to VCC.

There is an output/high impedance (/RST) signal/pin on STLink V2, should be connected to Micro-controller’s chip /Reset. So it will be able to reset the the micro-controller the STLink V2. Through Jtag/SWD command, it can soft reset the micro-controller, if the debug unit is reachable and you configure the OpenOCD script properly.

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Posted by LaurentL on 2018-09-06 10:13

Hello Rabbe,

The STM32 mcu has an internal pull-up on reset pin, so you just need to connect pin 15 of STLink (on the 20 pin connector) to the Reset input of mcu. Nothing else.

And remove your hard wired reset connection to VCC.

Rgds,
Laurent

Link

Posted by Rabbe on 2018-09-09 14:53
Thank you guys for your help :-D
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