From owner-freebsd-hackers  Mon Jul 17 17:43:36 1995
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From: terry@cs.weber.edu (Terry Lambert)
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Subject: Re: Twinchannel SCSI Adapter change
To: karl@Mcs.Net (Karl Denninger)
Date: Mon, 17 Jul 95 18:36:23 MDT
Cc: julian@ref.tfs.com, karl@mcs.com, freebsd-hackers@freebsd.org
In-Reply-To: <199507172208.RAA02711@Jupiter.mcs.net> from "Karl Denninger" at Jul 17, 95 05:08:47 pm
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> > You really need to probe them in the same order as DOS (the BIOS) does,
> > or you may not be able to get to your root disk and boot from it as well..
> > (the C:->sd0
> >      D:->sd1
> > --
> >      E:->sd2
> > mapping would become
> >       C:->sd1
> >       D:->sd2
> > --
> >       E:->sd0
> > 
> > 
> > and I'm pretty sure  we couldn't boot from that :)
> > The boot/kernel translation needs a LOT of work..
> 
> If the kernel read the EISA config, this would be possible.
> 
> But it doesn't, and thus isn't.

Reading the EISA config requires a VM86() interface.

This is because you will choke on about 20% of all EISA systems if you
make the normal assumption about CMOS memory size: the EISA standard
does not have specific requirements for per slot CMOS memory sizes.


					Terry Lambert
					terry@cs.weber.edu
---
Any opinions in this posting are my own and not those of my present
or previous employers.