Not necessarily. The manufacturer could have added custom drivers.
You can check compatibility in the openwrt wiki.

On July 22, 2018 6:15:33 PM CDT, Brian Russell <brinerustle@gmail.com> wrote:
I've seen a couple of cheap (gigabit and dual band for only 26€!) GL-iNet routers which apparently come with openwrt pre-installed:

MT7621A
WR1200JS

and also:

YK-L1

none of these are listed on any of the hardware compatibility wikis. Should I just assume they are fully capable of libremesh if they come with openwrt installed?

Brian in Barcelona

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