This message was posted on behalf of Intel Corporation
Thanks for using Intel Edison, we’ll try to help you with this.
We would like to know if you loaded the SDK scripts as it is mentioned in the section Loading the MCU SDK scripts onto your board, in this link https://software.intel.com/en-us/node/545143,
Additionally, as you mentioned, we must program pin muxing before using I2C from MCU, we configured the I2C-8 running the script init_i2c8.sh (https://software.intel.com/en-us/node/557356). This message /home/root/mcu_stuff/init_i2c8.sh: line 3: echo: write error: Device or resource busy indicates that the pin has been exported before, so it was already in the export file and didn’t indicate any error.
Also, we would like to know a little bit more information, which sensor are you using and its configuration? This is in order to help you.