<Vuokko>
I'm wondering if it would be possible to write a driver for a stupid and simple interface
<Vuokko>
The interface has USB uart, on computer side and writing a byte to it will set 4 pins to lowest 4 bits state. And then it would reply and another 4 input pins would be the lowest 4 bits
<Vuokko>
the rationale is that the USB-GPIO code is in the ROM of one chip so the requirements to get it running are basically clock, power and some continuity to USB connector and few other pins and no bad shorts
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<PaulFertser>
Vuokko: if you can make your USB devices supported by gpio kernel subsystem then it can be used by OpenOCD without additional drivers.
<Vuokko>
probably not going to happen as it is usb cdc acm serial port...