Date: Tue, 20 Sep 2011 16:09:06 -0500 From: "Matthew D. Fuller" <fullermd@over-yonder.net> To: Peter Jeremy <peterjeremy@acm.org> Cc: Bruce Cran <bruce@cran.org.uk>, freebsd-current@freebsd.org Subject: Re: 9.0 beta2 & the new bsdinstaller Message-ID: <20110920210906.GG14862@over-yonder.net> In-Reply-To: <20110920062349.GA84006@server.vk2pj.dyndns.org> References: <20110918095526.D866D1065670@hub.freebsd.org> <4E7734B7.8030507@cran.org.uk> <20110920062349.GA84006@server.vk2pj.dyndns.org>
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On Tue, Sep 20, 2011 at 04:23:49PM +1000 I heard the voice of Peter Jeremy, and lo! it spake thus: > On 2011-Sep-19 13:25:27 +0100, Bruce Cran <bruce@cran.org.uk> wrote: > >Will 64 kB be enough for 9.x? > > At least for x86 architectures, it seems adequate. [...] > > As for size, I'd suggest that if the default freebsd-boot size is > going to be changed, it should be adjusted so that the following > partition is aligned to a reasonably sized power of 2 - 128KB or > 256KB. I've been meaning to mention this, but we really should document somewhere that it has a _MAXIMUM_ size. I setup a system a few weeks back with GPT, and figured I'd just make the first 'real' partition start at the 1 meg mark. And make everything before that (1 meg - the however many sectors for the pmbr) the freebsd-boot partition. It worked fine, up 'till the point that I tried to boot, and it completely failed to, complaining that the boot code was too big. I had to track around in pmbr to find . . cmp $0x9000,%ax.. . # Don't load past 0x90000, . . jae err_big.. . # 545k should be enough for . . mov %ax,%es.. . # any boot code. :) and redo the partition to 512k (leaving a few hundred k unused before the next partition started) before it would boot. That's a little nerve-wracking to hit on a critical system... -- Matthew Fuller (MF4839) | fullermd@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream.
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