Minix on Bochs 2.1 on Linux
modified: 06 Feb 2004
Rob van der Leek <email@example.com> posted to the comp.os.minix
newsgroup the following notes on using Minix on Bochs 2.1 on a Linux
I. Bochs installation instructions for Linux
1. Get the latest source distribution from the Bochs website
At the time of writing this was version 2.1.
2. Unpack the source distribution. Configure the package and build
$ tar xvfz bochs-2.1.tar.gz
$ cd bochs-2.1
3. Hopefully everything went fine. The next step is to install
$ sudo make install
II. Installing Minix under Bochs
1. Create a new directory for the Minix installation:
$ mkdir minix
$ cd minix
2. Create a new hard disk file for Minix, for which you must use
the 'bximage' program (included with Bochs). The listing below
shows my input for bximage where I create an 80 Mb hard disk
Please type hd or fd. [hd] <enter>
Please type flat, sparse or growing. [flat] <enter>
Enter the hard disk size in megabytes, between 1 and 32255
What should I name the image?
You'll need the cyl, heads and sectors per track numbers in step
4 so be sure to write them down somewhere (for an 80 Mb hard
disk they are 162, 16 and 63).
3. Copy the VGA and BIOS ROM images that are included with the
Bochs distribution to the current directory:
$ cp /usr/local/share/bochs/BIOS-bochs-latest .
$ cp /usr/local/share/bochs/VGABIOS-elpin-2.40 .
4. Create a new '.bochsrc' file in the current directory, it should
look like this:
romimage: file=BIOS-bochs-latest, address=0xf0000
floppya: 1_44=floppy.img, status=inserted
ata0-master: type=disk, path=minix.img, cylinders=162, heads=16, spt=63
As you can see I used the cylinder, head and sector information
from step 2 here.
5. Next you'll need the installation disk images for Minix. I used
Minix version 2.0.3 and copied the disk images (ROOT.MNX,
USR.MNX, USR.TAZ, SYS.TAZ, CMD.TAZ, NET.TAZ) to the current
Create a symbolic link called 'floppy.img' to the Minix Root disk
$ ln -s ROOT.MNX floppy.img
Now you can boot minix (by starting Bochs with the 'bochs' command).
When Minix asks for the next disk (the USR disk), disable the
floppy in Bochs (click on the floppy icon, there should appear
a cross through it). Unlink ROOT.MNX and create a new link to
the USR disk image. Finally, make the disk active again in Bochs
and continue the installation process. Step-wise this means:
5a. (Click on the floppy icon in Bochs)
5b. $ rm -f floppy.img
5c. $ ln -s USR.MNX floppy.img
5d. (Click again on the floppy icon in Bochs)
Now you can finish the installation process for Minix as described
in other documents.
Note: Remember to change the boot option in '.bochsrc' to disk
when you want to boot from the hard disk.
III. Notes on installing the optional Minix packages
The Minix software packages are sometimes larger than the capacity of a
1.4 Mb disk. For example the USR.TAZ package is 3.9 Mb. To install this
package I used the following procedure:
1. Remove 'floppy.img' (if present).
$ rm -f floppy.img
2. Disable the floppy disk in Bochs, and create the first floppy
$ dd if=USR.TAZ of=floppy.img count=1440 bs=1024 skip=0
3. Enable the floppy disk in Bochs, and start the installation.
When it's time to change disks disable the floppy in
Bochs, remove the old image and create a new one skipping the
amount of blocks that make up the number of disks you already
read from the package.
For example, to read the second 'disk' from the image, skip
$ rm -f floppy.img
$ dd if=USR.TAZ of=floppy.img count=1440 bs=1024 skip=1440
Enable the floppy in Bochs ans continue as usual. Increase the
skip value to extract next disk images from the archive, e.g.
use 2880 for the third disk, 4320 for the fourth disk, and so
[From comp.os.minix 2004-02-05. Original newsgroup headers follow]
From: firstname.lastname@example.org (Rob van der Leek)
Subject: Re: Bochs 2.1 works with Minix
Date: Thu, 5 Feb 2004 00:25:52 +0000 (UTC)
Organization: University of Delft, The Netherlands
X-Trace: news.tudelft.nl 1075940752 22947 220.127.116.11 (5 Feb 2004 00:25:52 GMT)
NNTP-Posting-Date: Thu, 5 Feb 2004 00:25:52 +0000 (UTC)
X-Newsreader: trn 4.0-test76 (Apr 2, 2001)
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