Subject: Re: Installing new boot blocks
To: Frank van der Linden <frank@wins.uva.nl>
From: Paul Goyette <paul@whooppee.com>
List: port-i386
Date: 12/11/1998 16:16:12
It's a brand spanking new machine, a Millenium 450 from MicronPC (a
Pentium-II @ 450MHz).  I'm not sure what kind of BIOS I have (remember,
I'm not really very PC-literate), but if you tell how to find out, I'll
be happy to report what I find!  :)

Anyway, the drive is 8.4GB, and the geometry is as follows:
******* Working on device /dev/rwd0d *******
Warning: BIOS sector numbering starts with sector 1
parameters extracted from in-core disklabel are:
cylinders=16383 heads=16 sectors/track=63 (1008 sectors/cylinder)

parameters to be used for BIOS calculations are:
cylinders=16383 heads=16 sectors/track=63 (1008 sectors/cylinder)

Information from DOS bootblock is:
0: sysid 0 (unused)
    start 63, size 0 (0 MB), flag 0x0
        beg: cylinder    0, head   1, sector  1
        end: cylinder    0, head   0, sector 63
1: sysid 0 (unused)
    start 4192965, size 0 (0 MB), flag 0x0
        beg: cylinder   63, head  11, sector  1
        end: cylinder   63, head  10, sector 63
2: sysid 0 (unused)
    start 0, size 0 (0 MB), flag 0x0
        beg: cylinder    0, head   0, sector  1
        end: cylinder    0, head   0, sector  0
3: sysid 165 (FreeBSD or 386BSD or old NetBSD)
    start 63, size 1032129 (503 MB), flag 0x80
        beg: cylinder    0, head   1, sector  1
        end: cylinder 1023, head  15, sector 63

On Fri, 11 Dec 1998, Frank van der Linden wrote:

> On Fri, Dec 11, 1998 at 11:16:47AM -0800, Paul Goyette wrote:
> > 
> > What I really wanted to know is (1) is/are known issues with the
> > -current bootblock code, (2) have I found some new problem (in which
> > case, what info is needed tohelp get it fixed), or (3) if I did
> > something wrong.  Your response implies that (3) is the wrong answer,
> > which makes me feel less like a PC dummy.  :)
> > 
> > So, is/are there known issues with -current bootblocks, or what info do
> > people need to figure out my problem?
> 
> One problem was reported where BIOSes reported the presence of int13
> extensions (which the bootcode now uses if present), but calling
> them fails if the drive actually has < 1024 cylinders. Is this
> the case with your system? What does your MBR look like? What
> kind of BIOS do you have and now old is it?
> 
> - Frank
> 

-----------------------------------------------------------------------------
| Paul Goyette      | PGP DSS Key fingerprint:   | E-mail addresses:        |
| Network Engineer  |   BCD7 5301 9513 58A6 0DBC |  paul@whooppee.com       |
| and kernel hacker |   91EB ADB1 A280 3B79 9221 |  paul.goyette@ascend.com |
-----------------------------------------------------------------------------