Date: Thu, 30 Apr 1998 17:14:05 -0700 (PDT) From: Joe Touch <touch@ISI.EDU> To: freebsd-hackers@FreeBSD.ORG Cc: touch@ISI.EDU Subject: ATAPI probe hanging Message-ID: <199805010014.RAA22830@rum.isi.edu>
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Hi,
I have a problem booting a laptop with a detachable CDROM base unit,
when the unit is attached.
The configuration is:
Hitachi VisionBook Elite
2.2.5 kernel, PAO patches (970616) installed
The symptom is that, during boot:
finds fd0
finds wdc0 (wd0)
finds wdc1 (CDROM)
finds info about the CDROM at wcd0 - 1722 Kb/s...
finds info about the CDROM at wcd0 - no disc inside, unlocked
(hangs here)
This problem prevents me from using a boot floppy (the PAO floppy,
e.g.) to boot install from the CDROM.
In attempting to trace the problem, I turned on debugging, and noticed
that the kernel dealt fine with the first ATAPI device (#0), but it
was hanging in the probe of the second device (#1), which does not
exist on this machine. I found a temporary fix, which is:
Change "/usr/src/sys/i386/isa/wd.c" :
/*
* Probe all free IDE units, searching for ATAPI drives.
*/
for (unit=0; unit<2; ++unit) {
To:
for (unit=0; unit<1; ++unit) {
(the full patch is below)
I would like to know if there is a configuration change that would
avoid the need for this patch.
(alternately, if anyone might be able to build a 2.2.5 or 2.2.6
PAO boot floppy with that patch, I would be very grateful)
Thanks,
Joe
-------- (patch file follows) --------
*** wd.c Fri Feb 20 11:14:22 1998
--- wd.c-old Fri Feb 20 12:56:33 1998
***************
*** 736,743 ****
/*
* Probe all free IDE units, searching for ATAPI drives.
*/
! /* for Joe for (unit=0; unit<2; ++unit) { */
! for (unit=0; unit<1; ++unit) {
#if NCRD > 0
for (lunit=0; lunit<NWD; ++lunit)
if ((lunit_in_use & (1<<lunit)) && wddrives[lunit] &&
--- 736,742 ----
/*
* Probe all free IDE units, searching for ATAPI drives.
*/
! for (unit=0; unit<2; ++unit) {
#if NCRD > 0
for (lunit=0; lunit<NWD; ++lunit)
if ((lunit_in_use & (1<<lunit)) && wddrives[lunit] &&
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