03-18-2001
A couple of questions:
(1) When the system BIOS is running (before kernel boot strap/time) can you access the BIOS (using the DELETE key or whatever)?
(2) During the BIOs period above, does the system messages indicate that the hard disks are found? network cards? etc?
If (1) and (2) are OK, your new BIOs is fine. The problem is that your Master Boot Record or other boot blocks on the hard disk do not match the new BIOs (just an educated guess from the other end of the screen).
If the BIOS is operating properly, then you will have to reinstall the OS on top of the new BIOS. Before you do, you might consider reinstalling the old BIOS and making a backup of your important files. When you are satisfied, then reinstall the new BIOS (first) and reinstall the OS (second) on the new BIOS.
I can't speak about NT because all my back-office servers are Linux or other UNIXes. In my Linux systems, I've often changed BIOS or complete boards with old versions of the OS and never had any problem in the initial boot (using the old disk partitions). However, I normally rebuild a kernel immediately on the new board/BIOs, including rebuilding the disks with FDISK etc (and mount the old filesystem later).
Sounds like you are on the right track. You can also build an entire new OS on a new disk partition and mount the old disk(s) to recover files. Sorry, but my NT knowledge is weak because I can do all the 'server-side-stuff' on UNIX and don't have a reason for an NT server. Perhaps someone who is an NT guru can jump in and help in that area?
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LEARN ABOUT FREEBSD
boot0cfg
BOOT0CFG(8) BSD System Manager's Manual BOOT0CFG(8)
NAME
boot0cfg -- boot manager installation/configuration utility
SYNOPSIS
boot0cfg [-Bv] [-b boot0] [-d drive] [-e bell character] [-f file] [-i volume-id] [-m mask] [-o options] [-s slice] [-t ticks] disk
DESCRIPTION
The FreeBSD 'boot0' boot manager permits the operator to select from which disk and slice an i386 machine (PC) is booted.
Note that what are referred to here as ``slices'' are typically called ``partitions'' in non-BSD documentation relating to the PC. Typi-
cally, only non-removable disks are sliced.
The boot0cfg utility optionally installs the 'boot0' boot manager on the specified disk; and allows various operational parameters to be con-
figured.
On PCs, a boot manager typically occupies sector 0 of a disk, which is known as the Master Boot Record (MBR). The MBR contains both code (to
which control is passed by the PC BIOS) and data (an embedded table of defined slices).
The options are:
-B Install the 'boot0' boot manager. This option causes MBR code to be replaced, without affecting the embedded slice table.
-b boot0
Specify which 'boot0' image to use. The default is /boot/boot0 which will use the video card as output, alternatively /boot/boot0sio
can be used for output to the COM1 port. (Be aware that nothing will be output to the COM1 port unless the modem signals DSR and CTS
are active.)
-d drive
Specify the drive number used by the PC BIOS in referencing the drive which contains the specified disk. Typically this will be 0x80
for the first hard drive, 0x81 for the second hard drive, and so on; however any integer between 0 and 0xff is acceptable here.
-e bell character
Set the character to be printed in case of input error.
-f file
Specify that a backup copy of the preexisting MBR should be written to file. This file is created if it does not exist, and replaced
if it does.
-i volume-id
Specifies a volume-id (in the form XXXX-XXXX) to be saved at location 0x1b8 in the MBR. This information is sometimes used by NT, XP
and Vista to identify the disk drive. The option is only compatible with version 2.00 of the 512-byte boot block.
-m mask
Specify slices to be enabled/disabled, where mask is an integer between 0 (no slices enabled) and 0xf (all four slices enabled).
Each mask bit enables corresponding slice if set to 1. The least significant bit of the mask corresponds to slice 1, the most sig-
nificant bit of the mask corresponds to slice 4.
-o options
A comma-separated string of any of the following options may be specified (with ``no'' prepended as necessary):
packet Use the disk packet (BIOS INT 0x13 extensions) interface, as opposed to the legacy (CHS) interface, when doing disk I/O.
This allows booting above cylinder 1023, but requires specific BIOS support. The default is 'packet'.
setdrv Forces the drive containing the disk to be referenced using drive number definable by means of the -d option. The default is
'nosetdrv'.
update Allow the MBR to be updated by the boot manager. (The MBR may be updated to flag slices as 'active', and to save slice
selection information.) This is the default; a 'noupdate' option causes the MBR to be treated as read-only.
-s slice
Set the default boot selection to slice. Values between 1 and 4 refer to slices; a value of 5 refers to the option of booting from a
second disk. The special string ``PXE'' or a value of 6 can be used to boot via PXE.
-t ticks
Set the timeout value to ticks. (There are approximately 18.2 ticks per second.)
-v Verbose: display information about the slices defined, etc.
FILES
/boot/boot0 The default 'boot0' image
/boot/boot0sio Image for serial consoles (COM1,9600,8,N,1,MODEM)
EXIT STATUS
The boot0cfg utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
To boot slice 2 on the next boot:
boot0cfg -s 2 ada0
To enable just slices 1 and 3 in the menu:
boot0cfg -m 0x5 ada0
To go back to non-interactive booting, use fdisk(8) to install the default MBR:
fdisk -B ada0
SEE ALSO
geom(4), boot(8), fdisk(8), gpart(8)
AUTHORS
Robert Nordier <rnordier@FreeBSD.org>
BUGS
Use of the 'packet' option may cause 'boot0' to fail, depending on the nature of BIOS support.
Use of the 'setdrv' option with an incorrect -d operand may cause the boot0 code to write the MBR to the wrong disk, thus trashing its previ-
ous content. Be careful.
BSD
October 1, 2013 BSD