The WIKI document for FMCOMMS1 Calibration utility, xcomm_cal, should be updated. The given I2C EEPROM address given is not correct for the xc702 board. I assume the given example is for one of the other Xilinx boards that also works with the FMCOMMS.
It would be very helpful if the WIKI docs for this added some statement as to where the given cal EEPROM is located in the I2C tree for a given board type.
Also the given WIKI doc could add hat the new settings can be listed by typing
grep "" /sys/bus/iio/devices/iio:device4/out_voltage*
grep "" /sys/bus/iio/devices/iio:device5/in_voltage*
xcomm_cal docs at http://wiki.analog.com/resources/tools-software/linux-software/xcomm_cal
to note the given FMCOMMS1 cal eeprom appears at 6-0054 on the xc702