*BSD News Article 30465


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From: rob@pe1chl.ampr.org (Rob Janssen)
Subject: Re: Booting from CD-ROM, was: [Announcement] 386BSD Release 1.0
References: <2q63q2$927@dearg.cuillin.org.uk> <wright.86.000DC700@lims01.lerc.nasa.gov> <2q8qqr$q96@spool.cs.wisc.edu> <hastyCpCLny.5q8@netcom.com> <newcombe.142.00141E4A@aa.csc.peachnet.edu> <CpE8p7.H@wg.saar.de> <1994May7.211614.28288@ibr.cs.tu-bs.de> <1994May8.192122.5828@pe1chl.ampr.org> <2qph9o$jov@xmission.xmission.com>
Organization: PE1CHL
Date: Thu, 12 May 1994 10:08:29 GMT
Message-ID: <1994May12.100829.16849@pe1chl.ampr.org>
Reply-To: pe1chl@rabo.nl
Lines: 44

In <2qph9o$jov@xmission.xmission.com> vir@xmission.com (vir@45acp.slip.com) writes:

>Rob Janssen (rob@pe1chl.ampr.org) wrote:
>: In <1994May7.211614.28288@ibr.cs.tu-bs.de> rh@ramz.ing.tu-bs.de (Ruediger Helsch) writes:

>: >It is possible to boot from a CD-ROM. I made a CD with a boot block so
>: >it could be bootet from a SCSI CD-ROM hanging on an AHA1542B. But
>: >I do not know how many other SCSI adapters or CD-ROM controllers do
>: >allow this, I think even with the AHA1542C it would not work, its BIOS
>: >does simply refuse to boot a CD-ROM.

>: But what did you do to avoid the system booting from a harddisk?
>: I can understand (as I explained in another posting) that it is possible
>: to boot from a CD-ROM, at least as long as the BIOS does not explicitly
>: disallow it.  The bootcode just reads block 0 and performs some checks
>: on validity as a bootblock.
>: What I don't understand is how you can boot a CD-ROM which is at unit #1
>: (for example) while unit #0 is a harddisk.

>: Rob

>	Can't this the accomplished with lilo installed on the 1st HD and
>	the 2nd HD as the CDROM (using SCSI systems).  With lilo configured,
>	it should be able to load the linux or vmlinuz image from the
>	CDROM...  Haven't played with lilo for a while...  Maybe I'll
>	go try that tomorrow....

I would not call that 'boot from CDROM'...

I thought it would mean 'insert our CDROM in your existing system, press
RESET and it will load the system from the CD'.  Like you can do using
a floppy.
When you first need to have some software or setup on the HD, it is
essentially worthless as a method for loading a new OS.
(all other CDs either come with a boot floppy or a bootimage on the CD
and instructions on how to copy it to a floppy using another system.  that
is normally not called 'boot from CDROM' either)

Rob
-- 
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| Rob Janssen                | AMPRnet:   rob@pe1chl.ampr.org           |
| e-mail: pe1chl@rabo.nl     | AX.25 BBS: PE1CHL@PI8UTR.#UTR.NLD.EU     |
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