On Thu, 12 Oct 2000, Michael Wolfson wrote:

> This is in a 7500 with an Adaptec 2940UW PCI card, (driver version 4.1).  I
> can load almost any kernel from floppy or a SCSI drive on another bus (MESH
> "internal" or NCR "external").  Once it gets to the point of probing the
> SCSI busses for devices, it always fails in pretty much the same way:
> 
> [...]
> ahc0 at pci0 dev 15 function 0
> ahc0: interrupting at irq 25
> ahc0: aic7880 Wide Channel A, SCSI ID=7, 16/255 SCBs
> scsibus0 at ahc0 channel 0: 16 targets, 8 lunx per target
> [...]
> Waiting 2 seconds for scsi devices to settle
> ahc0: ahc_intr = referenced scb not valid during SELTO scb(9, 255)
> [repeats a lot]
> probe(ahc0:0:0): SCB 1d - timed out while idle, SEQADDR == 0x5
> SCSIRATE == 0x0
> probe(ahc0:0:0): SCB 1d: Immediate reset.  Flags = 0x4040
> probe(ahc0:0:0): no longer in timeout, state = 0
> panic: Waiting List inconsistency.  SCB index == 255, yet numscbs == 30.
> stopped at cpu_Debugger+0x10:    lwz r0, r1, 0x14,

> The firmware driver for the Adaptec card is from:
> <http://www.adaptec.com/support/overview/pd2940uw.html#drivers>
> One interesting note is that they have different drivers for "AV PowerMacs"
> and everything else (where the "AV PowerMacs" are the 7200-9600").
> 
> Any suggestions, other than unplugging the Adaptec PCI card?

Is there anything on the bus? Is it terminated?

Also, you might want to bring this up on tech-kern.

Take care,

Bill