Bochs User Manual
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# SCO OpenServer 5.0.5

Contributed by Carl Sopchak

You must read the message regarding software licenses in the Section called Third Party Software Licensing and Temporary Files in the chapter called Introduction to Bochs before you install SCO OpenServer 5.0.5 as a guest operating system in Bochs.

Back in April and May of 2002, I did some work on Bochs in order to get it to install and boot SCO's OpenServer 5.0.5 (OSR5). Since that time, I have had several e-mails asking about this error message or that. The newsgroup posts done at the time had all of the information that I knew, so I pointed people there. (I had not used Bochs since...) In February of 2003, I got another such e-mail. Since the sender indicated they were willing to pay me to get this going for them, I agreed to spend a few hours on it (for free, which is not common :-}). Subsequently, I decided to document this once and for all. (I did not charge anyone anything, this time...)

Note: These steps were originally used with Bochs 1.4.1 (or thereabouts, since I was using CVS heavily at the time). It is possible (likely) that later versions of Bochs are more tolerant/bug free, and this install may be abbreviated. However, I have not tried to streamline it at all.

These steps were performed and confirmed using Bochs version 2.0.2, and SCO OpenServer version 5.0.5. The host OS was Red Hat Linux 8.0.

First, I downloaded the tarball, and extracted the source tree. I decided to use the tarball instead of the RPM so that I knew what options were compiled in, etc.

    linux-$ tar -xzvf bochs-2.0.2.tar.gz

Next, I configured and compiled Bochs...

    linux-$ cd bochs-2.0.2
    linux-$ ./configure --enable-cdrom --enable-ne2000 --enable-host-specific-asms
    linux-$ make

The --enable-host-specific-asms should only be used if the host OS is an Intel x86 based OS.

I then created my disk image:

    linux-$ ./bximage
    ========================================================================
                                    bximage
                      Disk Image Creation Tool for Bochs
            $Id: user.dbk,v 1.138 2004/01/11 10:29:51 vruppert Exp $
    ========================================================================

    Do you want to create a floppy disk image or a hard disk image?
    Please type hd or fd. [hd] hd

    What kind of image should I create?
    Please type flat, sparse or growing. [flat]

    Enter the hard disk size in megabytes, between 1 and 32255
    [10] 2048

    I will create a hard disk image with
      cyl=4161
      heads=16
      sectors per track=63
      total sectors=4194288
      total size=2047.99 megabytes

    What should I name the image?
    [c.img] hd0.img

    Writing: [] Done.

    I wrote 2147475456 bytes to hd0.img.

    The following line should appear in your .bochsrc:
      ata0-master: type=disk, path="hd0.img", cylinders=4161, heads=16, spt=63

I then created my .bochsrc file. I did this via the interactive portion of Bochs, with the end result as follows:

    floppya: 1_44="/dev/fd0", status=inserted
    floppyb: 1_44="b.img", status=inserted
    ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
    ata0-master: type=disk, path="hd0.img", cylinders=4161, heads=16, spt=63, translation=auto, biosdetect=auto, model="Generic 1234"
    ata0-slave: type=cdrom, path="/dev/cdrom", status=inserted, biosdetect=auto, model="Generic 1234"
    ata1: enabled=0
    ata2: enabled=0
    ata3: enabled=0
    romimage: file=bios/BIOS-bochs-latest, address=0xf0000
    vgaromimage: bios/VGABIOS-elpin-2.40
    megs: 64
    parport1: enabled=1, file="lp.pipe"
    com1: enabled=0
    # no sb16
    boot: cdrom
    floppy_bootsig_check: disabled=0
    vga_update_interval: 300000
    keyboard_serial_delay: 250
    keyboard_paste_delay: 100000
    floppy_command_delay: 500
    ips: 3000000
    pit: realtime=1
    text_snapshot_check: 0
    mouse: enabled=0
    private_colormap: enabled=0
    i440fxsupport: enabled=0
    time0: 0
    # no ne2k
    newharddrivesupport: enabled=1
    # no loader
    log: osr5.log
    logprefix: %t-%e-%i%d
    debugger_log: -
    panic: action=ask
    error: action=report
    info: action=report
    debug: action=ignore
    pass: action=fatal
    keyboard_mapping: enabled=0, map=
    keyboard_type: mf
    user_shortcut: keys=none
    config_interface: textconfig
    display_library: x

Some important things to note are that you want to boot from the cdrom, and you do NOT want the ne2000 card configured initially. (We'll add that later...)

At this point, Bochs is ready to roll! Insert the OSR5 install CD into the drive, and start Bochs. You should soon see the SCO "boot:" prompt:

    SCO OpenServer(TM) Release 5

    boot
    : defbootstr disable=fdi,dptr

Note the disable= parameter that you need. These two SCO drivers cause the install to fail, so they need to be disabled for the install boot. You will not need this once OSR5 is installed.

During the install of OSR5, there are two default configuration answers that need to be changed. For the hard disk setup, you should turn bad tracking off, since it's unnecessary on an emulated disk. (It won't hurt to do it, it will just take a VERY long time!) For the network setup, change the network card to Deferred. You can change other settings, if you so desire. However, I would do the initial install with as little configured as you can get away with, then add whatever else is needed (one step at a time) after the initial install completes.

Let the install copy the files. Go get lunch. Take a nap. Go have dinner... This can take a LONG time. On my Pentium 4 1.7GHz system, this step took just over eight hours! (BTW, it was MUCH longer in version 1.4.1. Great job, guys!)

After the install finishes, you will need to change the following lines in .bochsrc file:

    ne2k: ioaddr=0x280, irq=10, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
    boot: c

Obviously, if you're not using Linux, the ethmode and ethdev values on the ne2k line will be different. Also, since Bochs uses "raw" network card access, you'll have to "setuid root" on the Bochs executable:

    linux-$ chown root bochs
    linux-$ chmod u+s bochs

(If there is a way to give a "normal user" CAP_NET_RAW capability, that would be an alternative. I don't know how to do that...) Restart Bochs. Now, you can just press Enter at the OSR5 boot: prompt, because the offending drivers have been linked out of the kernel.

Before you configure the network card, I'd strongly suggest getting the latest "nat" driver from SCO. Version 5.0.5b of this driver, according to the SCO web site, "correct[s] possible system lockup under high load due to internal buffer overflow." The driver can be found here. To get the Disk Image file into SCO, I downloaded the VOL.000.000 file to my linux box, and used tar to get it on to a floppy:

    linux-$ tar -cvf /dev/fd0 VOL.000.000

I then used tar within OSR5 to move it from the floppy to the /tmp directory:

    osr5-# cd /tmp
    osr5-# tar -xvf /dev/fd0135ds18

You can then use 'custom' to install the driver from the image file. You will then want to use 'scoadmin network' to configure the network card. Choose the Novell NE2000 card, and set the parameters to match the ne2k: line in the .bochsrc file. DO NOT have OSR5 look for the card, as Bochs may likely crash. (It did in version 1.4.1.)

You can also configure a printer, if you want. Using the spoolpipe utility that I wrote (which can be found in Bochs's misc directory), you can print from OSR5 through the parallel port, and you'll hardly notice that the printing is going through an extra layer of operating system! (You could also set up a printer using network printing, if the printer is not on the host machine...)

Obviously, dont forget to apply the release supplements and other patches that are considered "must haves" for OSR5: rs505a, oss600a, oss497b (others?).

That's about as far as I have got. I played around with OSR5 within Bochs a bit, but I can by no means say that I did any kind of real testing, let alone exhaustive testing.

And of course, YMMV! :-)

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