Don't know where the problem exists, picoprobe firmware, openocd version, some missing udev rules, something entirely else.

[dx9s]

Don't know where the problem exists, picoprobe firmware, openocd version, some missing udev rules, something entirely else.

[dx9s]

FWIW.. I've tried with -f interface/picoprobe.cfg alone and with -f interface/cmsis-dap.cfg alone as I've seen both used in different places.

[dx9s]

Okay... tried it with sudo:

dx@pop-os:~$ sudo openocd -f interface/cmsis-dap.cfg -c "adapter speed 5000" -f target/rp2040.cfg -s tcl
[sudo] password for dx: 
Open On-Chip Debugger 0.11.0-g8e3c38f (2023-11-12-20:03)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
adapter speed: 5000 kHz

Info : auto-selecting first available session transport "swd". To override use 'transport select <transport>'.
Info : Hardware thread awareness created
Info : Hardware thread awareness created
Info : RP2040 Flash Bank Command
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : Using CMSIS-DAPv2 interface with VID:PID=0x2e8a:0x000c, serial=E66098F29B8B4E32
Info : CMSIS-DAP: SWD  Supported
Info : CMSIS-DAP: FW Version = 2.0.0
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 0 SWDIO/TMS = 0 TDI = 0 TDO = 0 nTRST = 0 nRESET = 0
Info : CMSIS-DAP: Interface ready
Info : clock speed 5000 kHz
Info : DAP init failed

(the pico under debug is not connected, but this is further that previous)

It didn't occur to me that it is some other permission (outside serial) that is being blocked. Hopefully there is a udev rule that should work.

--Doug

[dx9s]

Okay found a Stack Exchange article (Arduino related) that was close enough to create a udev rule:

dx@pop-os:/etc/udev/rules.d$ cat 98-openocd.rules 
ACTION!="add|change", GOTO="openocd_rules_end"
SUBSYSTEM!="usb|tty|hidraw", GOTO="openocd_rules_end"
ATTRS{product}=="*CMSIS-DAP*", MODE="666", GROUP="plugdev"
LABEL="openocd_rules_end" 

performed a sudo udevadm control --reload-rules

and unplugged and replugged in my picoprobe and the following works as a normal user:

dx@pop-os:~$ openocd -f interface/cmsis-dap.cfg -c "adapter speed 5000" -f target/rp2040.cfg -s tcl
Open On-Chip Debugger 0.11.0-g8e3c38f (2023-11-12-20:03)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
adapter speed: 5000 kHz

Info : auto-selecting first available session transport "swd". To override use 'transport select <transport>'.
Info : Hardware thread awareness created
Info : Hardware thread awareness created
Info : RP2040 Flash Bank Command
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : Using CMSIS-DAPv2 interface with VID:PID=0x2e8a:0x000c, serial=E66098F29B8B4E32
Info : CMSIS-DAP: SWD  Supported
Info : CMSIS-DAP: FW Version = 2.0.0
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 0 SWDIO/TMS = 0 TDI = 0 TDO = 0 nTRST = 0 nRESET = 0
Info : CMSIS-DAP: Interface ready
Info : clock speed 5000 kHz
Info : DAP init failed

Might want to update the openocd source code to include a udev rule that is installed via the sudo make install