Re: port-atari/39965: "lock error" panic on install with Atari TT030

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR port-atari/39965; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: David Ross <dross%pobox.com@localhost>
Cc: David Holland <dholland-bugs%netbsd.org@localhost>, 
gnats-bugs%netbsd.org@localhost,
        port-atari-maintainer%netbsd.org@localhost, 
gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost
Subject: Re: port-atari/39965: "lock error" panic on install with Atari
        TT030
Date: Wed, 3 Dec 2008 08:17:28 +0000

 On Sun, Nov 30, 2008 at 09:12:13PM -0800, David Ross wrote:
 > c)  Same as b) but with BOOTX kernel.  No networking set up.
 > Result: mostly the same as b)...  Different panic but consistent with the 
 > "lock error" panic in terms of when it occurred.
 >
 > Screenshots:
 > http://i33.tinypic.com/2enx6zb.jpg
 > http://i37.tinypic.com/okwraw.jpg
 > http://i37.tinypic.com/281vpyg.jpg
 
 Ok, I think I've found the problem.
 
 biodone() relies on cpu_intr_p() to determine whether to shunt to a
 softint or plow straight ahead.
 
 The atari cpu_intr_p() tests the "idepth" variable managed by
 intr_dispatch() in atari/atari/intr.c. However, several of the
 interrupts, including the 5380 one, are hardwired and don't go
 anywhere near intr_dispatch().
 
 One then ends up in biodone2() in an interrupt handler, which is not
 supposed to happen, and everything goes downhill from there.
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost