How does android come in picture in secure boot activation process?

If we follow Sierra Wireless instruction to enable customer secure boot option, it prompts to go to android [site](

How does android come into picture here? As I know Legato is using yocto project linux distribution. While android is based on linux too, but it is different entity than yocto.

So why android comes into picture here?

The android tool is open source, so it can be re-use in order to sign the image.

Thanks, but I dont think this answer the question.

that means the tool can be used for the yocto image.

Is there any channel we can contact directly Sierra Wireless representative?

how about this link?