I have a custom router board how to add to lede support?

For Developers
1

I'm have a custom router board.
soc:qca9558,
switch:qca8337,
wireless:9880
how to add to lede support?
memory:256MB

2

If not already done, you can read on here on general advice about adding a new device:
https://lede-project.org/docs/guide-developer/adding_new_device