Date: Wed, 15 Mar 2000 19:38:42 +0900 From: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> To: doconnor@gsoft.com.au Cc: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> Subject: Re: Understanding AC97 Message-ID: <14543.26674.980546.81928B@rina> In-Reply-To: In your message of "Wed, 15 Mar 2000 19:32:31 %2B1030 (CST)" <XFMail.000315193231.doconnor@gsoft.com.au> References: <38CF4B63.5E4A01A3@cs.strath.ac.uk> <XFMail.000315193231.doconnor@gsoft.com.au>
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On Wed, 15 Mar 2000 19:32:31 +1030 (CST), "Daniel O'Connor" <doconnor@gsoft.com.au> said: Daniel> On 15-Mar-00 Roger Hardiman wrote: >> While AC97 is a standard, you still need >> to know how to setup the chip which interfaces AC97 to your >> ISA or PCI bus. Daniel> So conceviably you could have acbus0: a la miibus0: ? Not sure if the configuration will be like that in the future, but we now drive AC97 in a unified way implemented in sys/dev/sound/pcm/ac97.c. It would be interesting to work out a method to determine if a chip actually accompanies with an AC97 codec or some other one. Certain onboard sound systems have a PCI sound chip and an ISA codec (eg CS461x(PCI)-CS423x(ISA) and NeoMagic 256AV(PCI)-MSS(ISA)) to provide a legacy interface as well. In most cases these ISA codecs are not compatible with AC97, so the drivers need to handle them in a different way. -- Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> <tanimura@FreeBSD.org> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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