The Firmware and its components are mapped into the flash as follows:

Release 7 Components

WP77xx Firmware Release 7 combined image

Rebuild Linux Distribution or/and Legato from source

In case where you need to rebuild either the Linux Distribution or Legato or both, you can use the following resources:

The instructions to rebuild Legato are available on legato.io.

The instructions to rebuild the Linux Distribution through Yocto project are available here.

Build your custom Device Image

Once you have customized one or several of the components from source, or once you have created your own Base Legato System, it is time to assembly the components in one Device Image.

Note 1: You may decide to generate a custom Device Image without the full list of components (e.g. without Modem Firmware or without the Linux Distribution). If you do so, when you will flash this image later, only the components included within the custom Device Image package will be updated, the others will remain untouched. By doing this, you shall insure that the untouched components are compliant with the ones you are updating through the custom Device Image.

Note 2: If your custom Device Image is including a Base Legato System, when you will flash this image later, the Overlay Legato System will be erased and reinitialized with the same content as the Base Legato System.

Flash your custom Device Image

After having created your own Device Image, you can load it on your target.

Recovery

In case of failure after having downloaded within the product an unstable custom device image, you can launch a Recovery Procedure to restore a stable firmware.