*BSD News Article 88026


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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Installing FreeBSD with two hard drives
Date: 31 Jan 1997 22:56:08 GMT
Organization: Private BSD site, Dresden
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Gabor Kincses <gabor@acm.org> wrote:

> Just for the record: I have installed FreeBSD on a friend's box
> and he insisted on putting his FreeBSD installation after a
> 1000 MB DOS partition on a 3G IDE disk.  The installation worked.
> He has AMI BIOS, so I think it is smart enough to load the kernel
> image from >1024 cylinders.

It cannot be smart enough.  There are only 10 bits for the cylinder
number in the arguments to the INT 0x13 calls (plus 6 bits for the
head number).

However, most today's SCSI BIOSes use the entire available BIOS
address space, that is 1024 cylinders, 64 heads (some are over-
cautious and use only 63), 255 sectors per track.  This makes up for

j@uriah 1546% echo 'scale = 2; 1024*63*255*512 / (1024*1024*1024)' | bc
7.84

GB bootable area.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)