PCI Timing issues oldworld w/G4 upgrade

[Robert Serphillips]

The L2 is enabled and I removed the stock l2. The problem seems to
stem from some flaky timing between the bridge and the G4 bus
interface. This same problem tended to show up in older Power
Computing clones with G3/4 upgrade cards. Looking over the dmasound
source there seems to be a fix in place to re-sync the sound hardware
but for some reason the code is breaking.  Not really sure how to
approach this one.

-Rob

On Mon, 22 Jul 2002 23:29:51 -0400
Rich Dolinsky <r.e.dolinsky@verizon.net> wrote:

> Did you enable L2 cache with Bootx.  It may seem like a silly
> question if the answer is yes, otherwise it could be the root of the
> problem
> 
> on 7/21/02 3:41 PM, Robert Serphillips at rserphillips@austin.rr.com
> wrote:
> 
> > Seems to be some issues with the damsound modules when using
> > either a PCI nic or a PCI scsi card, in a PM8500 with a G4 400
> > upgrade. All problems go away when I use the original 604 120. If
> > I play mp3's while the drive is connected to the adaptec/apple
> > 2930C scsi card and generate a system load, the sound drops out
> > and this shows up in my log.. 
> > 
> > dmasound_pmac: tx-irq: xfer died - patching it up...
> > 
> > The app then freezes and I have to reload the module before I can
> > restore sound. By slowing the card down to a 5Mhz clock I can get
> > around this.
> > 
> > I can reproduce the problem in seconds by playing an mp3 and
> > generating some traffic across my 530tx 10/100 nic (8139too). Same
> > log and same fix as before.
> > 
> > I have no work around for this. Instead I use the on board mace
> > and deal with lower nfs performance.
> > 
> > I should point out that it's not just an mp3 under xmms that dies.
> > Same situation with xine, mpg123 or any app that uses
> > the dmasound module.
> > 
> > 
> > Kernel 2.4.18 ( same symptoms with 2.4.10 and 2.4.19)
> > PowerMac 8500 
> > XLR8 Carrier Card w/G4 400 45Mhz bus.
> > 
> > 
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