GRLIB I2C slave 
CONFIG_I2CSLV_ENABLE
  Say Y here to enable the I2C slave.

CONFIG_I2CSLV_HARDADDR
  Say Y here to configure the core with a hard coded address

CONFIG_I2CSLV_TENBIT
  Say Y here to enable 10-bit address support

CONFIG_I2CSLV_I2CADDR
  Value of (initial) I2C slave address

