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To: David Malone <dwmalone@maths.tcd.ie>
cc: freebsd-scsi@freebsd.org
Subject: Re: SCSI freezes in 2.2-STABLE 
In-reply-to: Your message of "Sat, 05 Apr 1997 20:17:03 +0100."
             <9704052017.aa27005@salmon.maths.tcd.ie> 
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Date: Sat, 05 Apr 1997 15:06:08 -0700
From: "Justin T. Gibbs" <gibbs@plutotech.com>
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>If it helps any these occured just before the last hang.

Actually, it helps quite a bit.  I just fixed one bug in the selection 
timeout handler of the driver that will remove the "referenced scb not 
valid..." message, but doesn't explain why you got a selection timeout in 
the first place.  The second bit of interesting information here is that 
even though we had been reselected (SELDI is true in SSTAT0), the driver 
didn't see it since the current sequencer address shows we're still 
looking for work to do.  I made a change to the sequencer that may affect 
that problem since the poll for work loop was the only place in the driver 
where we attempted to test for more than a single bit in that register at 
a time.  Its a shot in the dark, but it may solve this problem.  Let me 
know how these changes fair for you.  I don't know when the next CTM delta 
will be generated though...

>	David.
>
>Apr  5 19:30:06 synge /kernel: ahc1: ahc_intr - referenced scb not valid durin
>g 
>scsiint 0x8b scb(255)                                                         
>  
>Apr  5 19:30:06 synge /kernel: SIMODE0 = 0x0, SIMODE1 = 0xa4, SSTAT0 = 0x37   
>  
>Apr  5 19:30:06 synge /kernel: SEQADDR = 0x5                                  
>  
>Apr  5 19:30:15 synge /kernel: sd9(ahc1:1:0): SCB 0x2 - timed out while idle, 
>LA
>STPHASE == 0x1, SCSISIGI == 0xe6                                              
>  
>Apr  5 19:30:15 synge /kernel: SEQADDR == 0x5                                 
>  
>Apr  5 19:30:15 synge /kernel: sd9(ahc1:1:0): Queueing an Abort SCB           

--
Justin T. Gibbs
===========================================
  FreeBSD: Turning PCs into workstations
===========================================