Stumbles at boot!

Stumbles at boot!

Post by Paul Liemoh » Tue, 26 May 1998 04:00:00



Both of my SCO systems fail to boot when first powered up.  The OS 3.0 hangs
when looking at the SCSI Select software, the OS 5.04 hangs looking for a
boot floppy in the A: drive.  After the reset key is hit, both machines boot
up just fine.

I'd think the problem was unrelated to SCO, but the OS 5.04 machine booted
fine when it first came with W95 loaded.  Without modifications (save moving
the IDE CD from the primary to the secondary IDE controller), SCO was loaded
and the boot problem appeared.

OS 3.0 is a 120 MHz Pentium with SCSI CD.  3com NIC.
OS 5.04 is a 200 MHz Pentium Pro .  IDE CD.  Intel NIC.
Both have 32 MB RAM, Adaptec SCSI controller for disk & tape, Digiboard
PC/8e.

Thank you in advance for your kind assistance.  Paul.

 
 
 

Stumbles at boot!

Post by Jeff Lieberma » Thu, 28 May 1998 04:00:00


On Mon, 25 May 1998 22:09:58 -0500, "Paul Liemohn"


>Both of my SCO systems fail to boot when first powered up.  The OS 3.0 hangs
>when looking at the SCSI Select software, the OS 5.04 hangs looking for a
>boot floppy in the A: drive.  After the reset key is hit, both machines boot
>up just fine.

Well, both systems are* long before the SCSI disk drives
are being read by your undisclosed Adaptec SCSI adapter.  This is
a hardware problem and not an OS issue.  Due to the lack of
specifics, I can make some guesses.

1.  Take the floppy out of drive A:
2.  Set the CMOS configuration for drive C: and D: to NONE.  If
you have anything configured in there (including AUTO), it will
look for an IDE drive to boot from.
3.  If your undisclosed Adaptec SCSI adapter happens to be a
2940, check that you're not trying to boot from the cdrom or from
some SCSI ID other than zero.
4.  It is possible that your machine is trying to boot before the
hard disk is ready.  Set your CMOS to test all of memory, and
disable "fast boot".  If your Adaptec has a spin up delay
setting, try delaying the boot until the drive is ready.
5.  Set the boot sequence to  A:, then C:, then cdrom.
6.  If none of the above do anything interesting, remove any
un-necessary cards (Digi, NIC, SIO) from the system and try
again.  One of them might be* the bus.

Quote:>I'd think the problem was unrelated to SCO, but the OS 5.04 machine booted
>fine when it first came with W95 loaded.  Without modifications (save moving
>the IDE CD from the primary to the secondary IDE controller), SCO was loaded
>and the boot problem appeared.

Good point.  Check for MSDOS viruses in the boot sector.

----------------------  cut here ------------------------
:

# 03/16/93 by Steve Post
# Check hard disk boot block against stored image
# Must be root to read raw hard disk
# Boot block is 376 bytes in Unix 3.2.x and Xenix 386.
#
if [ ! -r /etc/masterboot ]
then
  echo "$0:  Error.  You must be root to read /etc/masterboot\
  and boot record."
  exit
fi

echo "$0: Comparing  /dev/rhd00  boot record with masterboot"
if ( dd if=/dev/rhd00 bs=376 count=1 | \
 /bin/cmp - /etc/masterboot ) 2>/dev/null
then
  echo "$0: Looks OK.  You're safe."
else
  echo "$0: Boot record changed.  You probably have a virus"
fi
----------------------  cut here ------------------------

If you're using some other boot manager (Partition Magic, System
Commander, LILO, OS/2 boot manager, the above virus test will not
work.

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--
Jeff Liebermann  150 Felker St #D  Santa Cruz CA 95060
(408)699-0483 pgr (408)426-1240 fax (408)336-2558 home
http://www.veryComputer.com/~jeffl   WB6SSY


 
 
 

1. completely stumbled--hard disk not detected

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Hash: SHA1
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go here: http://www.redhat.com/download/howto_download.html#bootimage,
search using the text string, "Choosing a Boot Disk Image File"; it
explains how to download and create the floppies you will require

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Michael J. Tobler: motorcyclist, surfer,  #    Black holes result
 skydiver, and author: "Inside Linux",     #   when God divides the  
 "C++ HowTo", "C++ Unleashed"              #     universe by zero

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