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Date: Tue, 14 Mar 2000 21:37:43 -0800 (PST)
From: kfarmer@sympatico.ca
Sender: nobody@FreeBSD.org
To: freebsd-gnats-submit@FreeBSD.org
Subject: Support for IIT's "XC87SLC-33" numeric processor broken in FreeBSD4.0
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>Number:         17385
>Category:       kern
>Synopsis:       Support for IIT's "XC87SLC-33" numeric processor broken in FreeBSD4.0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Mar 14 21:40:02 PST 2000
>Closed-Date:    Sun Apr 17 20:54:20 GMT 2005
>Last-Modified:  Sun Apr 17 20:54:20 GMT 2005
>Originator:     Kelvin Farmer
>Release:        FreeBSD-4.0
>Organization:
>Environment:
affects FreeBSD-3.1 and later.
>Description:
kernel.GENERIC from FreeBSD 4.0 causes panic after line:
npx0: Using INT 13 interface

Fatal trap 12: page fault while in kernel mode
supervisor read, page not present
...

npx0 flags 0x08 doesn't help. 'disable npx0' in config> doesn't stop npx0 from
being probed(?) either (like it has in earlier releases).


>How-To-Repeat:
attempt to boot FreeBSD 3.1 or greater on specific hardware.
(486SLC2 CPU with IIT "XC87SLC-33" Numeric Processor)
Note: same hardware runs FreeBSD-3.0, win95 with no problems.
Same computer with IIT co-cpu physically removed runs FreeBSD-4.0 ok.




>Fix:
in FreeBSD3.x, disable npx0 in config screen.
in FreeBSD4.0, it doesn't seem to be possible to disable npx0 when numeric
processor is present, but "broken".

If nothing else, add a comment to hardware.txt indicating that support for this
math co-cpu is broken. - not that its likely that many of these machines
are still around. =)


>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: iedowse 
State-Changed-When: Sun Apr 17 20:52:54 GMT 2005 
State-Changed-Why:  

Sorry, nobody took an interest in this, and the hardware is very 
old at this stage. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=17385 
>Unformatted:
