T.J.
Thanks for the advice - I upgraded the kernel to 2.2.14 and everything burst
into life. In particular, the Java sound examples I was trying to get going
now sound fine.
On another note, have you looked at the National UDMA drivers and if so did
you find that they improved performance noticeably ?
Regards,
Alex
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Chng Tiak-Jung
> Sent: 31 March 2000 17:03
> To: Alex J Lennon
> Cc: [EMAIL PROTECTED]
> Subject: RE: National Geode/MGx and Linux (sound problems)
>
>
> Alex J Lennon wrote:
> > Standard settings of 0x220, 5, 1, 5 except that the MPU401 is disabled
> > as the Linux box seems to lock up with it enabled.
>
> Yes, MPU401 emulation is not really there.
>
> > The CPU is the MediaGX-233 with 5530 companion. I'm not sure about the
> > VSA code version but I think it is the latest worker that was available
> > from Cyrix back before NS took over.
>
> There is a MS-DOS diagnostic utility called ATTEST that
> NSC has passed me can check everything including the VSA
> version. If you need that, I can pass to you.
>
> > I did the mod. to 'sound_config.h' as you suggested and changed the
> > DSP_BUFFSIZE
> > from 64Kb to 32Kb (also tried 16Kb). Recompiled the modules (Kernel
> > 2.2.12-20) and
> > updated my LinuxBox with sb.o, sound.o, uart401.o.
> > I checked that the DMA buffer sizes had actually changed with
> some printk()
> > messaging.
> > Unfortuately XMMS under GNOME (for example) is still playing
> .WAV files with
> > lots of
> > buzzing/clicking.
>
> There is another VSA SMI bug that caused the clicking noise between
> each DMA buffer is played. Upgrade to 2.2.13 or 2.2.14 to take
> advantage of the patch (kernel message will have the message
> "Working around Cyrix MediaGX virtual DMA bug.").
>
> Regards,
> Chng Tiak-Jung [EMAIL PROTECTED]
> Ericsson Research/Cyberlab Singapore Tel: +65-350-1649
> 510 Thomson Road, #18-00 Fax: +65-256-2403
> SLF Building, Singapore 298135 http://www.ericsson.com/
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