> This is absolutely true. However - and this makes no sense to me - Chromebooks apparently do upstream everything, even for ARM models. Any idea what went righ

> This is absolutely true. However - and this makes no sense to me - Chromebooks apparently do upstream everything, even for ARM models. Any idea what went right there? Isn't the ChromeOS HW platform support built at Google? At least in many cases they seem to first add support for a HW platform (board + SoC) under a codename to the tree and then various vendors ship products based on that HW platform.