One of the linksys routers that was advertised to support it, but the radio firmware was not officially supported and I had a lot of wireless connection issues so I replaced it.
DD-WRT has a license agreement and NDA in place with Broadcom that allow usage of better, proprietary, closed source wireless drivers (binary blobs) which they are not allowed to redistribute freely.
Broadcom has not released any FOSS drivers. Broadcom doesn’t support open-source much at all.
Basically bcm doesn't want people to use opensource.