kern/56889: Fwd: MODE_SENSE_BIG timeout hanging boot if CD-ROM is jumpered as master

[Angelo Turetta]

>Number:         56889
>Category:       kern
>Synopsis:       MODE_SENSE_BIG timeout hanging boot if CD-ROM is jumpered
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 15 05:10:13 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     Angelo Turetta
>Release:        FreeBSD 4.9-PRERELEASE i386
>Organization:
>Environment:
System: FreeBSD fw.ceditsrl.it 4.9-PRERELEASE FreeBSD 4.9-PRERELEASE #1:
Wed Sep 10 19:03:39 CEST 2003
toor at fw.ceditsrl.it:/usr/obj/usr/src/sys/CEDIT2 i386

	Intel 82801 chipset
	Pentium IV 2400
	Intel ICH4 builti-in ATA100 controller
	Maxtor 6E040L0 as master device on primary ATA bus
	Samsung CD-ROM SC-152A on secondary ATA bus

>Description:
	When the CD-ROM is set as master on its own bus (the factory 
setting
	on the PC I was installing) the kernel boot process stops after
	detecting ad0 and acd0. From then on, a seemingly endless 
sequence of

    acd0: MODE_SENSE_BIG command timeout - resetting
    ata1: resetting devices .. done

	lines are displayed on the screen.

>How-To-Repeat:

>Fix:
	Re-jumpering the CD-ROM to act as slave (instead of master)
	solves the problem. This hint was found in a message from a 
mailing
	list, and not on PR kern/36610 (which was recently closed, but the
	promlem is not solved)

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