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Date: Thu, 14 Oct 1999 21:53:43 +0200 (CEST)
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Subject: i386/14334: AHA-1542A not supported by FreeBSD 3.x ("compensating")
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>Number:         14334
>Category:       i386
>Synopsis:       AHA-1542A not supported by FreeBSD 3.x ("compensating")
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 14 13:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Bertram Barth
>Release:        FreeBSD 3.1-RELEASE i386
>Organization:
none/private
>Environment:

AHA-1542A from 1988, FreeBSD 3.3-RELEASE

>Description:

aha0 is found and probed correctly but fails when probing for
attached devices. Output during boot is:

aha0 at 0x330-0x333 irq 11 drq 5 on isa
aha0: AHA-1540/1542 64 head BIOS FW Rev. 0.6 (ID=41) SCSI Host Adapter, SCSI ID 
7, 16 CCBs
Waiting 15 seconds for SCSI devices to settle
aha0: AHA-1540A detected, compensating
aha0: AHA-1540A detected, compensating
aha0: AHA-1540A detected, compensating
aha0: AHA-1540A detected, compensating
aha0: AHA-1540A detected, compensating
aha0: AHA-1540A detected, compensating

then the machine just hangs.

works with FreeBSD 2.x, output of "boot -v" in 2.2.8:
aha0: Rev 41 (AHA-154x[AB]) V0.6, enabling residuals, target ops

>How-To-Repeat:

Boot with Install-floppies of FreeBSD 3.x or 4.0-current

>Fix:
	
disabling residuals in aha.c cured the problem on my machine.
I've no clue about the consequences of the modification I did,
but if possible I'd like to have this as the default for the
GENERIC kernel, since it make installation possible with this
controller. On the other hand residuals IMHO aren't the real
source of the problem since obviously they worked in 2.2.8.

Context diff of sources from 3.1-RELEASE follows:

*** aha.c       Wed Jan 20 07:21:26 1999
--- aha.c-orig  Thu Oct 14 20:55:46 1999
***************
*** 242,249 ****
        aha->unit = unit;
        aha->tag = tag;
        aha->bsh = bsh;
!       aha->ccb_sg_opcode = INITIATOR_SG_CCB_WRESID;
!       aha->ccb_ccb_opcode = INITIATOR_CCB_WRESID;
  
        if (aha->unit != AHA_TEMP_UNIT) {
                aha_softcs[unit] = aha;
--- 242,249 ----
        aha->unit = unit;
        aha->tag = tag;
        aha->bsh = bsh;
!       aha->ccb_ccb_opcode = INITIATOR_CCB;
!       aha->ccb_sg_opcode = INITIATOR_SG_CCB;
  
        if (aha->unit != AHA_TEMP_UNIT) {
                aha_softcs[unit] = aha;



>Release-Note:
>Audit-Trail:
>Unformatted:


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