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Date: Thu, 19 Oct 2000 13:56:23 -0700
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To: Rob Winters <rob@annapurna.com>
Cc: freebsd-questions@FreeBSD.ORG, freebsd-mobile@FreeBSD.ORG
Subject: Re: new IBM Thinkpads rejecting FreeBSD
References: <5.0.0.25.0.20001018145632.00ac76f8@mail.fiderus.com>
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Rob Winters wrote:

> Someone else wrote:
> > > The rep at IBM Tech Support claims that IBM is aware of this problem. He
> > > claimed that FreeBSD was "writing the boot sector somewhere above the usual
> > > boot sector location". His explanation doesn't make sense, and he was
> > unable
> > > to provide me with any specifics...

> Jonas Bulow <jonas.bulow@servicefactory.se> wrote:
> I just killed a ThinkPad A20p by installing 4.1-RELEASE. Apparently IBM allows
> for boot sector programs of a certain size, i.e. "LILO-sized". After that, the
> BIOS stores power management information ON THE BOOT SECTOR. If the BIOS finds
> unpalatable information in that location (presumably whatever FreeBSD puts
> there),
> then it gets very confused:

I recovered a system recently on which the 'booteasy' boot sector had gotten clobbered.
Rewriting the boot0 file, I noticed it is 1024 and not 512 bytes - the 2nd sector on the
disk is used as well as the 1st. That explains both the above remarks.
I'd guess LILO's boot block is one sector long.


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