hauke@Espresso.Rhein-Neckar.DE wrote:

> >Hmm, then LC630 (Q630) might have some quirk around esp DMA
> >and should we handle it in mac68k/obio/esp.c?
> 
> Sounds like it... maybe the issue hasn't shown up so far because most
> people stick with IDE disks for that Mac?

Okay, I'll commit the patch for Q630 later.

> Interesting. I had the Cheetah in a PowerMac G3/400 before on an Adaptec
> U2W, and it would fall back to async there, as soon as another disk was on
> the bus with it. In addition, the other disk (a 9 GB IBM U2W that the Mac
> shipped with) would then fall back to narrow (8 Bit) SCSI. So there's
> definitely something fishy there.

Hmm, looks cable or termination problem..

> OTOH, the Cheetah ran on a Sun sbus fas adapter for years without problems.
 :
> doesn't make a difference for the Quadra, with or without a
> PQUIRK_CAP_WIDE16. The disk has a 16-to-8 bit adapter, maybe that leads the
> kernel to assume async operation?

Probably your drive supports only fast (>5.0MB/s) sync ops
and esp(4) on mac68k is too slow (up to 4.0MB/s?) so
it might reject sync message from host?
---
Izumi Tsutsui