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- [ 15 January 1998
- The Linux Linux+OS2+DOS mini-HOWTO is not being maintained by
- the author any more. If you are interested in maintaining the
- Linux+OS2+DOS mini-HOWTO, please get in touch with me at
- <gregh@sunsite.unc.edu>. ]
-
- Linux + OS/2 (+ DOS) mini-HOWTO, version 0.2. May 20, 1996.
- by Hamish Moffatt, moffatt@yallara.cs.rmit.edu.au.
- Please send all corrections, suggestions, etc to this address.
-
- Thanks go to Matthieu Willm <mwillm@vnet.ibm.com> for his post
- on this subject in comp.os.linux.setup, which prompted me to
- write this mini-HOWTO.
-
- Table of Contents
- 0. Legal things
- 1. Introduction
- 2. Before you read this document
- 3. The actual installation
- 3.1 Some background
- 3.2 Install Linux
- 3.3 Install LILO
- 3.4 Add Linux to OS/2's Boot Manager menu
- 3.5 If you get LILO rather than OS/2 Boot Manager when you reboot
- 3.6 Advanced options
- 4. If you've already installed Linux, but not OS/2 ...
- 4.1 Installing OS/2
- 4.2 Troubleshooting
- 5. If you've already installed both Linux and OS/2 ...
- 5.1 If you can boot OS/2 but not Linux
- 5.2 If you can boot Linux but not OS/2
- 6. Getting LILO to boot OS/2 ...
- 7. The end.
-
- 0. Legal things
-
- The instructions in this HOWTO will change the boot loader on your
- computer. During the course of these instructions some mistakes
- may make your system unable to boot either Linux or OS/2 or DOS,
- or perhaps none of the above. Make sure you have your Linux boot
- and root disks, your OS/2 Installation and Disk 1 diskettes,
- and your DOS Setup disks if relevant handy before you begin.
- The writer takes no responsibility for any damage incurred during
- the process of these instructions; there is no warranty, guarantee
- etc whatsoever.
-
- 1. Introduction
-
- When I first got interested in Linux, in about August 95, I was told
- that while it should be possible to have OS/2 Boot Manager and Linux
- coexist, it "just didn't work." When I actually got around to installing
- OS/2 and Linux together on a new PC, it turned out that it works perfectly
- and isn't actually too hard. This mini-HOWTO should help you get these
- two working together.
-
- Note: in this document, I will describe how to have OS/2 Boot Manager
- boot Linux (via LILO). There is a short section later on on having
- LILO (Linux's loader and boot manager) boot OS/2.
-
- 2. Before you read this document
-
- In this mini-HOWTO I assume you have already installed OS/2 (and also
- DOS if you wish) on your system. If you've already installed Linux
- but not OS/2, or both OS/2 and Linux, see section 4 or 5 respectively.
-
- Note that you need to have OS/2 Boot Manager installed. If you have OS/2
- and DOS on the same partition (and you switch between them with BOOT /DOS
- and BOOT /OS2), then you're using Dual Boot, not Boot Manager. You need
- to read the LILO documentation or mini-HOWTO on booting another (non-Linux)
- operating system. This HOWTO is for Boot Manager only.
-
- 3. The actual installation
- 3.1 Some background
-
- So, you have OS/2 and maybe DOS already installed. (In this HOWTO my
- examples will have DOS also installed). Your partition table might
- look something like this;
-
- Device Boot Begin Start End Blocks Id System
- /dev/hda1 1 1 254 512032+ 6 DOS 16-bit >=32M
- /dev/hda2 256 256 786 1070496 5 Extended
- /dev/hda3 * 255 255 255 2016 a OS/2 Boot Manager
- /dev/hda5 * 256 256 509 512032+ 7 OS/2 HPFS
- /dev/hda6 * 510 510 763 512032+ 83 Linux native
- /dev/hda7 * 764 764 786 46336+ 82 Linux swap
-
- Here hda1 contains DOS, hda3 is Boot Manager, hda5 is the OS/2 (boot)
- partition, and hda6 is the Linux (boot) partition. If your OS/2 partition
- is FAT rather than HPFS, that's fine -- these instructions apply just
- the same. Also, while OS/2 Boot Manager must be on /dev/hda somewhere,
- OS/2 and Linux could be on /dev/hdb, hdc, or hdd, etc. (OS/2 BootMan has
- no problems booting OS/2 from a second disk, so it should have no problems
- booting Linux from a second disk. I haven't been able to get DOS to boot
- from a second disk, though.)
-
- 3.2 Install Linux
-
- At this point, you should install Linux. You are best to create your
- DOS and OS/2 (and extended, if necessary) partitions using OS/2's FDISK,
- then creating your Linux partitions with Linux's fdisk. Some people have
- reported that sometimes OS/2 thinks the partition table is corrupt and
- won't let you add Linux to the Boot Manager menu later, so you might have
- to try creating ALL your partitions with OS/2's FDISK, and using Linux's
- fdisk later to change the partitions to the right types. See the fdisk
- documentaton for further information on changing partition types.
- (Thanks to bubeck@informatik.uni-tuebingen.de (Till Bubeck).)
-
- Your distribution's installation program should ask you about installing
- LILO; Slackware's does. You do want LILO installed (OS/2 Boot Manager cannot
- boot Linux directly, since it's doesn't understand Linux's file system format.
- Also, adding LILO gives you a chance to choose between different versions
- of Linux, add boot parameters so Linux can find all your hardware, etc.)
-
- 3.3 Install LILO
-
- Slackware will ask you WHERE you want to install LILO; the SuperBlock
- (partition table, master boot record etc), the Linux partition's boot
- sector, etc. The boot manager that lives in the SuperBlock is your master
- boot manager - you want this to be OS/2's Boot Manager, so you need to install
- LILO (Linux's boot manager) in the boot sector of your Linux partition.
- In the partition table example above, this would be on /dev/hda6.
- (NOT /dev/hda, which would be the master boot record, where OS/2 BootMan
- lives.)
-
- Finish your Linux installation. If the installation hasn't run it for you,
- run /sbin/lilo. You MAY need to create your own /etc/lilo.conf, which is
- the LILO configuration file; it tells LILO where it can find the Linux
- kernel (the operating system itself) on your hard drive, etc. A very
- simple one might be
-
- boot = /dev/hda6
- delay = 50
- vga = normal
- ramdisk = 0
-
- image = /vmlinuz
- root = /dev/hda6
- label = linux
- read-only
-
- boot specifies the partition where LILO will install itself; this should be
- /dev/hdax, not /dev/hda (or hdb, as appropriate).
-
- 3.4 Add Linux to OS/2's Boot Manager menu
-
- Now you have Linux installed and ready to go, but after you reboot, you won't
- be able to boot it. All that's left now is to tell OS/2 Boot Manager about it.
- Reboot, and select OS/2 from the Boot Manager menu. (If you get a "LILO"
- prompt instead of Boot Manager, read section 3.5 below).
-
- Boot up OS/2, and run FDISK. Move to your Linux partition (listed as
- "Type 83" -- OS/2 doesn't seem to know Linux's partition types). Press Enter,
- and from the menu select "Add to Boot Manager menu." Enter an appropriate
- name (eg Linux), then press F3, save and exit.
-
- When you reboot, your OS/2 Boot Manager menu should include Linux. When you
- select it, you should see "LILO " for about five seconds, then Linux should
- boot. If it does, you're all finished. Enjoy!
-
- 3.5 If you get LILO rather than OS/2 Boot Manager when you reboot
-
- If when you reboot, you get "LILO ", rather than OS/2 Boot Manager, then
- you've installed LILO in the superblock (/dev/hda), rather than on a
- partition (/dev/hda6 or whatever). To fix this isn't too hard, luckily.
- Boot up your OS/2 Installation floppy, and exit to the command prompt.
- Run FDISK, then save and exit. Boot Manager should be back when you reboot.
- However, now you can't boot Linux again. Get out your Linux boot and root
- disks, and mount your Linux partition. You can either boot completely from
- diskettes, then type
-
- mount /dev/hda6 /mnt
-
- once you can log in, or (depending on your distribution), you can mount
- your hard drive instead of the root floppy. On Slackware, you can do this
- by typing
-
- mount root=/dev/hda6
-
- at the LILO prompt you get as soon as you've booted the boot disk.
-
- Now, edit your LILO config (either /mnt/etc/lilo.conf or /etc/lilo.conf,
- depending on which of the above methods you used), and change the
- "boot = " line to say /dev/hda6 (or whatever) instead of /dev/hda.
- Then run
-
- /mnt/sbin/lilo -C /mnt/etc/lilo.conf
-
- or
-
- /sbin/lilo
-
- depending on which method you used before. Reboot again, and OS/2 Boot
- Manager should be back. See section 3.4 on adding Linux to the OS/2
- Boot Manager menu.
-
- 3.6 Advanced options
-
- If you want to save a few seconds during booting, you can get "delay = 0"
- instead of 50 in your /etc/lilo.conf. Using the delay gives you a chance
- to boot another operating system, but you're using OS/2 Boot Manager for that,
- so you may not need it. (However, LILO also gives you the chance to boot
- different Linux kernel versions, and you may want that).
-
- Actually, if you press shift immediately after you select Linux from the
- Boot Manager menu, you get the "LILO: " prompt anyway. LILO loads very
- quickly though, so this can be harder than it sounds.
-
-
- 4. If you've already installed Linux, but not OS/2 ...
- 4.1 Installing OS/2
-
- You have Linux installed, and when you boot your PC you get the LILO
- prompt. You want to install OS/2. This might actually be easier than installing
- OS/2 before Linux, actually.
-
- Boot Linux, and edit your /etc/lilo.conf file. Change the "boot = " line to
- the name of your linux partition, eg /dev/hda6, instead of the name of
- your boot drive, eg /dev/hda. Then run /sbin/lilo to install LILO again.
- This will install LILO in the boot sector of your Linux partition, so that
- OS/2 can boot it later.
-
- Now, install OS/2. When you create your OS/2 partitions in OS/2's FDISK,
- *do* install Boot Manager, and make sure you add your OS/2 (and DOS)
- partition to it. Also, add your Linux ("Type 83" in OS/2 FDISK) partition
- to the menu too. (Press Enter on the Linux partition, and select
- "Add to Boot Manager menu", and enter a suitable description). You should
- now be all set to boot Linux and OS/2 from the Boot Manager menu.
-
- 4.2 Troubleshooting
-
- If, when you select Linux from the Boot Manager menu, you get Missing
- Operating System, Non-system disk or disk error, etc, then you didn't
- get LILO installed properly in your Linux partition's boot sector.
- Use your Linux boot (and maybe also root) disk to edit your lilo.conf
- file again as in section 4.1, and make sure you run /sbin/lilo.
- (Section 3.5 gives some information on how you can boot Linux from
- floppies and get access to your Linux partition on hard drive).
-
- If you get LILO when you reboot, instead of OS/2 Boot Manager, then
- BootMan wasn't installed properly. Boot the OS/2 Installation disks
- again, quit to the command prompt (F3), and run FDISK. Make sure
- Boot Manager is installed, and that the BootMan partition is marked
- Bootable.
-
- 5. You've already installed both OS/2 and Linux ...
-
- Both LILO (Linux's boot manager and loader) and OS/2 BootMan like to
- be the master boot manager on your system. If you've already installed
- both of these using default options, then you probably can't boot
- one of these two at the moment (the one you installed first won't
- be bootable).
-
- OS/2 BootMan HAS to be the master boot manager, but LILO can be moved
- so it only boots Linux.
-
- 5.1 If you can boot OS/2 but not Linux
-
- You need to boot Linux (using your boot and root floppies if need be;
- see section 3.5 on how to get to your Linux hard disk partition from
- the boot/root disks).
-
- Edit your /etc/lilo.conf and change "boot = " to the name of your Linux
- partition (eg /dev/hda6) rather than your boot drive (eg /dev/hda).
- Run /sbin/lilo. (Section 3.5 gives more details about getting to
- these files).
-
- Now, boot OS/2 and run FDISK. Select your Linux partition ("Type 83"),
- and select "Add to Boot Manager menu" from the pop-up menu. You should
- now be all set.
-
- If you reboot and Linux still isn't listed, check that you added it
- properly in the last step. If Linux is listed but you get missing system
- or non-system disk errors when you select it, you might not have
- got LILO installed correctly in the first part of 5.1.
-
- 5.2 If you can boot Linux but not OS/2
-
- See the instructions in 5.1. To boot Linux, just boot from your hard
- drive as normal; to boot OS/2, use the Installation diskette, and
- exit to the command prompt (F3) to run FDISK.
-
-
- 6. Getting LILO to boot OS/2 ...
-
- Theoretically, LILO could boot OS/2; that is, at the LILO prompt you
- could hit Shift and enter OS2 or whatever. I have tried this, and it
- didn't work. However, my OS/2 is on /dev/hdb6, which may complicate
- things.
-
- In /etc/lilo.conf, you need to add
-
- other = /dev/hda5
- label = os2
-
- (if your OS/2 partition is /dev/hda5). You should also add
-
- table = /dev/hda
-
- (or hdb) so that Linux can check for the partition, but I got
- missing partition errors when running /sbin/lilo.
-
- If your OS/2 is on your second hard drive, you also need to add
-
- loader = /boot/os2_d.b
-
- else /sbin/lilo won't run successfully (it requires a special loader
- to boot OS/2 from a second hard drive, and os2_d.b is it).
-
- If you've been able to get this working, please let me know.
-
-
- 7. The end.
-
- Please send your comments, suggestions, questions (as a last resort, please)
- to me at
-
- moffatt@yallara.cs.rmit.edu.au
-
- The latest version of this mini-HOWTO should be at
-
- http://yallara.cs.rmit.edu.au/~moffatt/linux-os2/
-
-