Date: Fri, 6 Dec 2019 15:49:45 +0530 From: malepati vishnuvardhan <malepativishnuvardhan1997@gmail.com> To: Adrian Chadd <adrian.chadd@gmail.com> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org> Subject: Re: Regarding Chipset selection By the driver Message-ID: <CAMU65Xwqas1L-w=1EpdGw8ZWmiwr-6rJyKSnQDJLyg4tSmEYeg@mail.gmail.com> In-Reply-To: <CAJ-Vmo=uzHNOyRJH8vYM3HX4Pko09GJHbkgvij-ST_iwhA801Q@mail.gmail.com> References: <CAMU65Xz_Ch9bQXoEBdtWtsVfESA%2BN%2B1d9-Va%2BrFVQUT7iGK5KQ@mail.gmail.com> <CAJ-Vmo=uzHNOyRJH8vYM3HX4Pko09GJHbkgvij-ST_iwhA801Q@mail.gmail.com>
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Hi, Thanks a lot for the information. On Fri, Dec 6, 2019 at 2:01 PM Adrian Chadd <adrian.chadd@gmail.com> wrote: > Hi! > > I've documented the layout in the wiki: > > wiki.freebsd.org/dev/ath(4) and wiki.freebsd.org/dev/ath_hal(4) . You > should start there. > > The HAL code is a bit twisty: > > * the driver - if_ath_*[ch] is common for everything; > * the if_ath_pci.c code detects the NIC and creates the if_ath context > and sets up the driver; > * the ar9287 related bits are in sys/dev/ath/ath_hal/ar9002/ar9287_*.[ch] > * I think it also uses a bit of code in the ar9280_.*[ch] and the RF > frontend in that directory > * the bulk of the MAC support is the same as the other 11n chips, and > that's in sys/dev/ath/ath_hal/ar5416/ ; and > * to save code duplication, the ar5416 HAL actually uses the code in > sys/dev/ath/ath_hal/ar5212/ where the chipset support is the same. > > The reasons are! > > * The AR5416 is the first 11n chipset by atheros, and although the > radio and chunks of the MAC are different (to do 11n!), the queue and > airtime management parts of the MAC are the same as as the AR5212. So > to save on code duplication, the original contributor called the > AR5212 routines from the AR5416 HAL where the hardware was the same; > * The AR9287 is an evolution of the AR9280 NIC, albeit 2G only with > some specific extensions which we don't support. > > I hope that helps! > > > > -adrian >
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