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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.cs.su.oz.au!news.adelaide.edu.au!gateway.dircsa.org.au!cleese.apana.org.au!apanix.apana.org.au!miff From: miff@apanix.apana.org.au (Michael Smith) Newsgroups: comp.os.386bsd.questions Subject: Re: [FreeBSD] Booting frm sd0 as default? Date: 31 Aug 94 01:05:36 GMT Organization: Apanix Public Access Unix, +61 8 373 5485 (5 lines) Lines: 30 Message-ID: <miff.778295136@apanix.apana.org.au> References: <miff.777745860@apanix.apana.org.au> <Cv369J.KK3@cogsci.ed.ac.uk> <miff.777951515@apanix.apana.org.au> <CvAuq8.It@cogsci.ed.ac.uk> NNTP-Posting-Host: seldon.apanix.apana.org.au Keywords: booting FreeBSD richard@cogsci.ed.ac.uk (Richard Tobin) writes: >In article <miff.777951515@apanix.apana.org.au> miff@apanix.apana.org.au (Michael Smith) writes: >>But if you have one of each, the boot code doesn't go looking at every >>disk first, so it can't tell this. The "hd" is a special case that >>assumes this : hd(0... goes to 0x81 and uses 0,0 while hd(1... goes to 0x81 >>and uses 4,0. >> >>Makes sense, no? 8) >Not very extensible, though. >So if I have two IDE disks and a SCSI disk, and I want to boot from the >SCSI, I should hack something into the boot program to use 0x82 and 4/0? >(DOS does seem to see the SCSI disk as 0x82.) It's entirely likely that you wouldn't actually be able to boot from the SCSI under those circumstances - depending on whether or not your BIOS is capable of supporting more than two harddisks. - If you're not loading any device drivers for the SCSI card then I would assume it does, and yes, you're right there. As has been observed, the boot code is perhaps due for an overhaul 8) >-- Richard -- # mike smith : miff@apanix.apana.org.au - Silicon grease monkey # # "The question 'why are the fundamental laws of nature mathematical' # # then invites the trivial response 'because we define as fundamental # # those laws which are mathematical'". Paul Davies, _The_Mind_of_God_. #