[yocto] [meta-raspberrypi] Missing config.txt in rpi-basic-image.bb

[Chaitanya Dhere]

Hello all,
              I am working on rpi-basic-image. After flashing this
image, raspberry pi 2 boots up fine. But I'm unable to locate
config.txt under /boot directory. I want to put :

dtparam=i2c1=on

in that file so as to work on a sensor based on i2c1 bus.
Currently I'm unable to locate i2c-1 device. i2c-dev and i2c-bcm2708
modules are already loaded.

Kindly let me know how to enable it.

Thanks,
Chaitanya