Subject: Re: NeoMagic 256AV audio driver?
To: Jonathan Stone <jonathan@DSG.Stanford.EDU>
From: Jason Thorpe <email@example.com>
Date: 10/19/1999 13:37:07
On Tue, 19 Oct 1999 13:09:30 -0700
Jonathan Stone <jonathan@DSG.Stanford.EDU> wrote:
> Doing a small Web search and asking Linux-on-Vaio users gave two
> possible options to get sound hardware working:
> a) Linux 2.2.x reportedly attaches the NeoMagic via its SoundBlaster
> hardware-emulation; the device reportedly attaches via
> the Linux SoundBlaster driver as an ESS1688.
> b) A native-hardware driver, using the Neomagic hardware API
> which someone found via `psychic means'. Works on the 505 line.
> Based on Intel AC97, it has no DMA but uses a ring-buffer located
> just above the end of the 2.5Mbyte video memory.
> see http://www.uglx.org/sony.html for more info.
c) Use it under WSS emulation, like I do on my Dell Inspiron
Neomagic MagicMedia 256AV Audio (audio multimedia, revision 0x20) at pci1 dev 0 function 1 not configured
opl0 at isa0 port 0x388-0x38b: model OPL3
midi0 at opl0: <Yamaha OPL3>
wss0 at isa0 port 0x530-0x537 irq 5 drq 0 drq2 1: CS4231 or AD1845
audio0 at wss0: full duplex
Note that I occasionally get:
ad1848_commit: Auto calibration timed out
...and after suspend/resume, seems like interrupts stop working, but it's
usually good enough for me to listen to NPR news via RealAudio :-)
> One tradeoff is that the SB emulation apparently gets a synthesizer;
> the `native' API relies on a Windows software synthesizer
> So. Do we have AC97 support? Is it OK to rewrite something based on
> the Linux code (which is given as public-domain, not copyleft).
> Or pursue the ESS1688 emulation?
Ezra Story just submitted a patch for AC97 for the Creative AudioPCI.
> (Does anyone have sound working on a NeoMagic 256AV already?)
-- Jason R. Thorpe <firstname.lastname@example.org>