On Fri, 22 Jun 2018 at 20:45, Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx> wrote: > Firmwares may not provide all monitor mode features in the "cap" iovar. > For those this fallback mechanism uses "sta_monitor" iovar. If firmware > is compiled with stamon, this iovar will fail with BCME_NOTUP; Otherwise > it fails with BCME_UNSUPPORTED. It's probably not the first time ever, but it appears your research (theory) doesn't match my experience (practice) ;) I'm afraid you missed some important check when analyzing firmware code. I've just tested all firmwares I got (for 43602a1, 4366b1 and 4366c0) and all of them return -4 (BCME_NOTUP) for "sta_monitor" when firmware/interface is down. It appears this test requires bringing firmware/interface up to make it reliable. Apparently even firmwares *without* sta_monitor return -4 (BCME_NOTUP) when firmware/interface is down. -- Rafał
