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Troubleshooting Tips - or "These are the times that try men's souls"
--------------------------------------------------------------------
The following tips and tricks may help you turn a failing (or failed)
installation attempt into a success. Please read them carefully.
---
Summary: Hardware conflict or misconfiguration.
Problem: A device is conflicting with another or doesn't match
the kernel's compiled-in IRQ or address.
Cause: While most device drivers in FreeBSD are now smart
enough to match themselves to your hardware settings
dynamically, there are a few that still require fairly
rigid configuration parameters to be compiled in (and
matched by the hardware) before they'll work. We're
working hard to eliminate as many of these last
hold-outs as we can, but it's not always as easy as
it looks.
Solution: There are several possible solutions. The first,
and easiest, is to boot the kernel with the -c flag.
When you see the initial boot prompt (from floppy or
hard disk), type:
/kernel -c
This will boot just past the memory sizing code and
then drop into a dynamic kernel configuration utility.
Type `?' at the prompt to see a list of commands. You
can use this utility to reset the IRQ, memory address,
IO address or a number of other device configuration
parameters. You can also disable a device entirely
if it's causing problems for other devices you'd much
rather have work. Note that this only affects the
kernel being booted temporarily, it does not "write out"
the information to the kernel so that these settings
are permanantly altered (this would be actually rather
hard). If you reboot, you'll have to make the same
changes again. The goal of the -c utility is to get
you up far enough to be able to download the appropriate
sources and configure and rebuild a kernel more specific
to your needs.
Another solution is, obviously, to remove the offending
hardware or simply strip the system down to the bare
essentials until the problem (hopefully) goes away.
Once you're up, you can do the same thing mentioned
above - compile a kernel more suited to your hardware,
or incrementally try to figure out what it was about
your original hardware configuration that didn't work.
---
Summary: My floppy-tape drive isn't probed.
Cause: Last-minute problems with this driver caused it to be disabled
by default.
Solution: Boot with -c (described above) and set the flags value of
fdc0 to 1. This will re-enable the floppy tape driver.
Sorry, but it was causing problems for other people!
---
Summary: When I boot for the first time, it still looks for /386bsd!
Cause: You still have the old FreeBSD 1.x boot blocks on your
boot partition.
Solution: You should re-enter the installation process, invoke
the (F)disk editor and chose the (W)rite option. This
won't hurt an existing installation and will make sure
that the new boot blocks get written to the drive.
If you're installing for the first time, don't forget
to (W)rite out your new boot blocks! :-)
---
Summary: I want to boot FreeBSD off the second drive. It doesn't!
Cause: FreeBSD will actually install just fine on a drive other
than 0 (the first drive), and the boot manager will even
allow you to select it, but the boot blocks rather
pathologically assume 0. This should be fixed in 2.1.
Solution: Easy - follow these steps:
1. Select the first (0) drive from the (F)disk editor
and write out the boot manager with the (B) option.
This will enable the boot manager that allows you to
actually boot off the other drive.
2. Exit the fdisk editor for the first drive and and
re-enter it again for the drive you wish to install
on. Set up a partition on this drive, or select
(A)ll for the entire drive.
3. Enter the disklabel editor and allocate space on
your second drive as normal. Proceed with the
installation.
4. Once you've installed on the disk and are going to
reboot from the hard disk, enter the following at
the boot prompt:
hd(1,a)/kernel
This will ensure that you really boot from the second
drive. If you've actually installed on a drive other
than 1 (the 3rd or 4th drive?), substitute that number
in for the above. You will need to enter this EVERY
time you reboot from the hard disk. If you're feeling
brave and have a srcdist + the requisite experience,
you can hack the boot blocks in:
/usr/src/sys/i386/boot/biosboot
So that this drive you're booting from is hard-coded.
Recompile the boot blocks and reinstall them on your
drive with `disklabel -B ...' You can then have the
default Do The Right Thing.
---
Summary: Newfs crashes, requesting that blocksize be 32K
Cause: You have your SCSI controller configured to translate
geometries for disks >1GB in size.
Solution: Turn such translation OFF in your controller's BIOS
setup! FreeBSD has no problems with disks >1GB just
so long as the root partition starts and ends BELOW
cylinder 1024. This is a PC hardware limitation.
---
Summary: FreeBSD won't boot off the hard disk
Cause: Root partition does not start and end below cylinder 1024.
Solution: See solution for newfs crashes, or move your root
partition. This limitation holds true for ANY operating
system you wish to boot from your hard drive.
---
Summary: FreeBSD still won't boot off the hard disk
Cause: No boot code is installed in sector 1.
Solution: Chose the Write MBR (B)oot code in the FDISK editor.
---
Summary: Nope, FreeBSD's still not booting from the hard disk.
Cause: BIOS disk geometry different from that used when
installing FreeBSD.
Solution: With IDE drives, pay careful attention to the geometry
information that FreeBSD prints out when it's first
booting off the floppy. Use this geometry in your BIOS
setup or use the BIOS geometry when you install FreeBSD.
Either way, they have to match.
With SCSI drives, the values they report is most often
bogus and cannot be used. In this situation, the SCSI
controller is performing geometry translation and
it's probably wise to assume a default of 64 heads,
32 sectors and 1MB/cylinder. Use these values when
you install FreeBSD. See above comments concerning
newfs failures for more info.
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