Hey Eric, so I ruled out the dsp as the problem since I am getting the same behavior on an nxp nuttx-flashed board. It appears the external device is the issue as it is not responding to i2c commands. From what I can tell qurt uses the same I2C 'transfer' command at least with the same parameters. It can find the device on the bus when I give the command "qshell xm125_evk start -X -b 4" but probing it appears to be impossible right now.
B