ahc driver now borked in -current?

OK, this is going to be a little hard to give all the right information 
for given that the symptoms I'm reporting don't even allow the box in 
question to get up far enough to generate useful debugging info, but 
I'll give it my best shot anyway.

In short, this is an older dual PIII box with the on-board Adaptec 
Ultra/Wide controller (one of the older ASUS motherboards we all used 
to covet when they cost $600 a pop).  Plugged into that controller are 
two IBM LVD drives, a CDROM drive and an iomega Jaz drive (remember 
those? :).

Running a -current kernel from May 1st, the box works just fine albeit 
with one warning when it tries to probe the Jaz drive, which has no 
media in it.  If you like, I can try stuffing a Jaz disk in there for 
giggles, but the error in question is benign in any case (see below).  
Using a kernel compiled on July 6th, however, I can't get any farther 
than the "Waiting 2 seconds for SCSI devices to settle" message you see 
below, then there's a long delay followed by a dump of the card state 
(sadly, to the screen rather than some non-perishable medium) and lots 
of whining about the number of SCBs which were just aborted.  It 
continues looping in that way, resetting the controller and whining, 
forever.

Unfortunately, the only other machine in this room is a Mac and those 
are notorious for not having serial cards, so it's not even going to be 
easy to wire up a serial console to this baby, but I can always give it 
a shot if someone thinks that data will be really helpful - I'll have 
to go get a USB serial adaptor or something.

Anyway, here's the relevant boot messages from a *functioning* (May 
1st) kernel.  That's the last time the ahc driver worked on my system.  
   Like I said, with the non-functioning kernel, we don't get any 
further than waiting for the SCSI devices to settle and then 
abort/looping:

ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> port 0xb000-0xb0ff mem 
0xdd800000
-0xdd800fff irq 14 at device 6.0 on pci0
ahc0: Reserved 0x100 bytes for rid 0x10 type 4 at 0xb000
ahc0: [GIANT-LOCKED]
aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
...
Waiting 2 seconds for SCSI devices to settle
SMP: AP CPU #1 Launched!
da2 at ahc0 bus 0 target 5 lun 0
da2: <iomega jaz 2GB E.17> Removable Direct Access SCSI-2 device
da2: 20.000MB/s transfers (20.000MHz, offset 15)
da2: Attempt to query device size failed: NOT READY, Medium not present
cd0 at ahc0 bus 0 target 4 lun 0
cd0: <TOSHIBA CD-ROM XM-6401TA 1009> Removable CD-ROM SCSI-2 device
cd0: 20.000MB/s transfers (20.000MHz, offset 16)
cd0: Attempt to query device size failed: NOT READY, Medium not present
da0 at ahc0 bus 0 target 0 lun 0
da0: <IBM DDRS-39130D DC1B> Fixed Direct Access SCSI-2 device
da0: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged 
Queueing Enabled
da0: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C)
da1 at ahc0 bus 0 target 2 lun 0
da1: <IBM DDRS-39130D DC1B> Fixed Direct Access SCSI-2 device
da1: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged 
Queueing Enabled
da1: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C)
(da2:ahc0:0:5:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0
(da2:ahc0:0:5:0): CAM Status: SCSI Status Error
(da2:ahc0:0:5:0): SCSI Status: Check Condition
(da2:ahc0:0:5:0): NOT READY asc:3a,0
(da2:ahc0:0:5:0): Medium not present
(da2:ahc0:0:5:0): Unretryable error
Opened disk da2 -> 6
(da2:ahc0:0:5:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0
(da2:ahc0:0:5:0): CAM Status: SCSI Status Error
(da2:ahc0:0:5:0): SCSI Status: Check Condition
(da2:ahc0:0:5:0): NOT READY asc:3a,0
(da2:ahc0:0:5:0): Medium not present
(da2:ahc0:0:5:0): Unretryable error
Opened disk da2 -> 6
Mounting root from ufs:/dev/da0s1a

--
Jordan K. Hubbard
Engineering Manager, BSD technology group
Apple Computer