Adding OpenWrt support for TP-Link Archer VR400 V1

I'm looking closely at this, as I have a similar device I'm hoping to add support for. I wanted to look at the changes that you made, but I couldn't find them with the link in your post. I found them by looking back through the patch list, and I think this might be the correct link:

posting it here in case anyone was trying to use it to understand how to add support for a new bcm63xx device (as I am).