Date: Wed, 30 Jul 2003 22:49:09 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Ruslan Ermilov <ru@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 locore.s Message-ID: <20030730222110.S2810@gamplex.bde.org> In-Reply-To: <20030730073231.GB37041@sunbay.com> References: <200307292157.h6TLv1VE066076@repoman.freebsd.org> <20030730073231.GB37041@sunbay.com>
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On Wed, 30 Jul 2003, Ruslan Ermilov wrote: > On Tue, Jul 29, 2003 at 02:57:01PM -0700, Bruce Evans wrote: > > bde 2003/07/29 14:57:01 PDT > > > > FreeBSD src repository > > > > Modified files: > > sys/i386/i386 locore.s > > Log: > > Restored clearing of the bss, except for putting it in a correct place > > with up to date comments. This fixes booting kernels with boot2 > > (except for loss of the features provided by loader) and is suitable > > for MFC. Contrary to the old comments, most loaders don't clear the bss. > > biosboot lost clearing of the bss in a code crunch in 1997, and boot2 > > never did it. > > > To make it crystal clear, it does mean that we can (once again) boot > kernels without loader(8) on i386, correct? Almost. There are still the following problems: Symbols will be missing unless you use my hack for faking some module data (I still haven't de-magiced it). But symbols don't seem to be needed as much as they used to. I didn't notice them missing when I tested this. if you do use my hack, then you need to use an old version of boot2, since boot2 in -current lost its RB_BOOTINFO flag so it doesn't actually pass the historical bootinfo extensions that it spends a lot of space to set up, and my hack and/or the preload_metadata handler is fragile and causes panics if the symbol table is empty. I think the problem is that a real symbol table is never empty. Other things in the extended bootinfo are not needed, at least for me. Statically configured hints and environment are needed of course. Bruce
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