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From: Darren Reed <avalon@coombs.anu.edu.au>
Subject: 2.2.1 & 2940UW....
To: hackers@freebsd.org
Date: Wed, 2 Apr 1997 01:16:17 +1000 (EST)
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so to test out the 2940 handling in 2.2.1, I boot up...

ahc0 <Adaptec aic7880 Ultra SCSI host adapter> rev 0 int a irq 10 on pci0:12
ahc0: Using left over BIOS settings
ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs
ahc0 waiting for scsi devices to settle
(ahc0:4:0): "WANGTEK 6130-HS 4G16" type 1 removable SCSI 2
st0(ahc0:4:0): Sequential-Access density code 0x13,  drive empty
probe0(ahc0:9:0): scsi_cmd
probe0(ahc0:9:0): scsi_done
(ahc0:9:0): command: 0,0,0,0,0,0-[0 bytes]
probe0(ahc0:9:0): scsi_cmd
probe0(ahc0:9:0): scsi_done
(ahc0:9:0): command: 40,0,0,3,0,0,0,0,0,0-[0 bytes]
probe0(ahc0:9:0): scsi_cmd
probe0(ahc0:9:0): scsi_done
(ahc0:9:0): command: 12,0,0,0,2c,0-[44 bytes]
------------------------------
000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
016: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
032: 00 00 00 00 00 00 00 00 00 00 00 00 
------------------------------
...

then try to dump a filesystem (dump 0bdsf 64 108000 9000 /dev/nrst0 /usr).

Soon after, the tape drive hangs...and I see this:
st0(ahc0:4:0): SCB 0x0 - timed out in dataout phase, SCSISIGI == 0x6
SEQADDR == 0x125
st0(ahc0:4:0): abort message in message buffer
st0(ahc0:4:0): SCB 0x0 - timed out in dataout phase, SCSISIGI == 0x16
SEQADDR == 0x125
st0(ahc0:4:0): no longer in timeout
ahc0: Issued Channel A Bus Reset. 1 SCBs aborted
Clearing bus reset
Clearing 'in-reset' flag

, I kill the remaining dump program and try "mt status" only to be greeted
with the following:

st0(ahc0:4:0): SCB 0x0 - timed out while idle, LASTPHASE == 0x1, SCSISIGI == 0x0
SEQADDR == 0x6
st0(ahc0:4:0): SCB 0: Immediate reset.  Flags = 0x1
st0(ahc0:4:0): no longer in timeout
ahc0: Issued Channel A Bus Reset. 1 SCBs aborted
Clearing bus reset
Clearing 'in-reset' flag

which seems to be repeating in some loop.
2.2.1-RELEASE FreeBSD 2.2.1-RELEASE #0: Tue Apr  1 23:47:31 EST 1997

(this is no APril 1 joke)

Is there anyone interested in even trying to fix this ?

Darren