On Sun, 3 Mar 2002, Achim Linder wrote:
> Hi,
>
> as already mentioned, there is a correlation between bit 11 (SMOD
> LSB) of the Extended Legacy Audio Control register (0x42-0x43) of
> the YMF chips and the "floppy access crashes with alsa ymfpci driver"
> phenomenon, i.e. I can avoid these crashes if I add this line to the
> alsa source
>
> legacy_ctrl2 |= 1 << 11;
>
> (or if dma8=1). The kernel ymfpci driver uses v = 0x8800;
> to initialize this register - and is well behaved. If I change this
> to v = 0x8000; and load the module with parameters, the machine
> locks up if I try to access the floppy drive.
>
> The number 0x8800 seems to come from the old ymf_sb driver.
> Unfortunately it doesn't mention the origin of this value
> (Yamaha sample code?), but wouldn't it be a good idea to patch
> the alsa driver, e.g. to adopt the behaviour of the kernel ymfpci,
> or to add a snd_sbdma8 parameter, so people can try to use the
> chipset default (dma8=1) instead of the alsa default?
Do this patch fix your problem?
Index: ymfpci.c
===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/pci/ymfpci/ymfpci.c,v
retrieving revision 1.11
diff -u -r1.11 ymfpci.c
--- ymfpci.c 25 Feb 2002 11:50:13 -0000 1.11
+++ ymfpci.c 3 Mar 2002 19:56:00 -0000
@@ -109,7 +109,7 @@
}
legacy_ctrl = 0;
- legacy_ctrl2 = 0;
+ legacy_ctrl2 = 0x0800; /* SMOD = 01 */
if (id->device >= 0x0010) { /* YMF 744/754 */
if (snd_fm_port[dev] < 0)
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project http://www.alsa-project.org
SuSE Linux http://www.suse.com
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