Hi Siva,
No, you need to refer to “Rebuild Linux Distribution or/and Legato from source” section.
i.e. SWI9X07Y_02.16.02.00 Source is the complete Yocto Linux package used to customize and build your own Linux.
Basically, you just need to extract the package (tar), then “make” to build.
Customization steps depends what device/driver you are going to add.
Maybe you can refer to below doc (for FX30 adding Bluetooth) as example to understand the customize and build/flash process.
https://source.sierrawireless.com/resources/airlink/application_notes_and_code_samples/airlink_appnote_using-bluetooth-with-the-mirage-iot-card/
Thx