<entropy@zippy.bernstein.com> (maximum entropy) writes:

> scsibus0: waiting 2 seconds for devices to settle...
> ahc0: target 0 synchronous at 10.0MHz, offset = 0xf
> probe(ahc0:0:0): SCB 1d - timed out in Message-in phase, SEQADDR == 0x153
> SCSIRATE == 0xf
> probe(ahc0:0:0): BDR message in message buffer
> probe(ahc0:0:0): SCB 1d - timed out in Message-in phase, SEQADDR == 0x153
> SCSIRATE == 0xf
> probe(ahc0:0:0): no longer in timeout, status = 0
> ahc0: Issued Channel A Bus Reset. 1 SCBs aborted
> ahc0: target 6 synchronous at 10.0MHz, offset = 0xf
> cd1 at scsibus0 target 6 lun 0: <HP, CD-Writer+ 9200, 1.0e> SCSI4 5/cdrom removable

I see some similar messages on one of my systems:

ahc0 at pci2 dev 10 function 0
ahc0: interrupting at irq 10
ahc0: aic7890/91 Wide Channel A, SCSI Id=7, 16/255 SCBs
scsibus0 at ahc0 channel 0: 16 targets, 8 luns per target
ahc1 at pci2 dev 14 function 0
ahc1: interrupting at irq 10
ahc1: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
scsibus1 at ahc1 channel 0: 16 targets, 8 luns per target
...
scsibus0: waiting 2 seconds for devices to settle...
ahc0: target 0 using 16bit transfers
ahc0: target 0 synchronous at 40.0MHz, offset = 0x1f
ahc0: target 0 using tagged queuing
sd0 at scsibus0 target 0 lun 0: <QUANTUM, VIKING II 9.1WLS, 3506> SCSI2 0/direct fixed
sd0: 8709 MB, 8338 cyl, 10 head, 213 sec, 512 bytes/sect x 17836668 sectors
scsibus1: waiting 2 seconds for devices to settle...
ahc1: target 5 using 8bit transfers
ahc1: target 5 synchronous at 20.0MHz, offset = 0xf
probe(ahc1:5:0): SCB 1d - timed out in Status phase, SEQADDR == 0x155
SCSIRATE == 0xf
probe(ahc1:5:0): BDR message in message buffer
probe(ahc1:5:0): SCB 1d - timed out in Status phase, SEQADDR == 0x155
SCSIRATE == 0xf
probe(ahc1:5:0): no longer in timeout, status = 0
ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
ahc1: target 5 synchronous at 20.0MHz, offset = 0xf
cd0 at scsibus1 target 5 lun 0: <NEC, CD-ROM DRIVE:464, 1.05> SCSI2 5/cdrom removable

Access to the CD after that are sometimes iffy, but I haven't yet
quantified the problems.

        - Nathan