I'm currently trying to get a MCP23017 expander chip working with my DragonBoard410c.
I have it working with a RaspberryPi3 so I know the chip & wiring are good.
Unfortunately when I try to access it as I did with the RPi3 I always get the error "Slave address was not acknowledged".
AFAIK the chip should be able to work with 1.8V. Is there anything I have to do different with the DragonBoard?