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Problem with stlink

Question asked by xavier.jose on Jul 24, 2014
Latest reply on Jul 25, 2014 by xavier.jose
I'm trying to program a board with a stm32f0308-disco st-link but it only works if I power the board with the 3v from the disco board if I power the board from an external 3.3V it gives this error:
ze@ze-VGN-CS11S-W:~/Development/openocd-code$ openocd -f tcl/interface/stlink-v2.cfg -f tcl/target/stm32f0x_stlink.cfg
Open On-Chip Debugger 0.9.0-dev-00093-g518ce9e (2014-07-09-16:15)
Licensed under GNU GPL v2
For bug reports, read
Info : This adapter doesn't support configurable speed
Info : STLINK v2 JTAG v17 API v2 SWIM v0 VID 0x0483 PID 0x3748
Info : using stlink api v2
Info : Target voltage: 2.909697
Error: init mode failed
in procedure 'init'
in procedure 'ocd_bouncer'
in procedure 'transport'
in procedure 'init'

How can I identify where the problem comes?