stm32f4 with nucleo-f401RE
I had quite a lot of similair messages working on a stm32f103C8 ‘bluepill’ board. This only had a 4-wire SWD connector (No reset). The only way I could get openocd to work was by editing the cfg scripts in D:\Ac6\SystemWorkbench\plugins\fr.ac6.mcu.debug_1.11.1.201611241417\resources\openocd\scripts and comment out the line
‘reset_config srst_only srst_nogate connect_assert_srst’
in the file ‘target\stm32f4.cfg
I’m assuming your board level script is ‘nucleo_f401re.cfg’
This too would need the line ‘reset_config srst_only srst_nogate’ commented out and replaced by ‘reset_config none’
Hope this works for you as well.
;){kind=link}