kern/68066: recent kernel cannot boot on pc98 with ata disks

[NAKAJI Hiroyuki]

>Number:         68066
>Category:       kern
>Synopsis:       recent kernel cannot boot on pc98 with ata disks
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jun 18 01:40:20 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     NAKAJI Hiroyuki
>Release:        FreeBSD 5.2-CURRENT i386
>Organization:
>Environment:
System: FreeBSD xa12.heimat.gr.jp 5.2-CURRENT FreeBSD 5.2-CURRENT #2: Sun Jan 4 12:30:30 JST 2004 root at xa12.heimat.gr.jp:/usr/obj/usr/src/sys/NAKAJI i386



>Description:
	The recent kernels cannot boot on my PC-9821Xa12 with two IDE
drives. The 'boot -v' log of failure is available at
http://heimat.jp/~nakaji/FreeBSD/pc98-Jun08.log, for example. The
kernel of Jan 4 2004 JST can boot and work fine.
	I tried cvsup and build{world,kernel} again and again with
various date=... and finnaly found that the difference of
sys/dev/ata/ata-queue.c between 1.20 and 1.21 on Feb 17 19:24 2004
causes the boot failure, that is, the kernel of
date=2004.02.17.19.00.00 can boot and works well and that of
date=2004.02.17.20.00.00 cannot.
	I'm not sure what it is aimed at, but after this commit, my
pc98 box cannot use any newer kernels.

	The kernel configuration is following.

include	GENERIC
ident	NAKAJI
nooption	INVARIANTS
nooption	INVARIANT_SUPPORT
nooption	WITNESS
nooption	WITNESS_SKIPSPIN
options		NETATALK
options		QUOTA
options		MSGBUF_SIZE=40960
device	pcm


>How-To-Repeat:
	n/a
>Fix:
	n/a
>Release-Note:
>Audit-Trail:
>Unformatted: