Date: Sat, 14 Oct 2006 21:15:55 -0400 From: Jerry McAllister <jerrymc@msu.edu> To: Valentin Nechayev <netch@lucky.net> Cc: Jan Pfeifer <jan.pfeifer@yahoo.com.br>, freebsd-questions@freebsd.org Subject: Re: Boot2 loading process Message-ID: <20061015011555.GB25929@gizmo.acns.msu.edu> In-Reply-To: <20061014183053.GA6898@lucky.net> References: <20061014164101.8507.qmail@web52113.mail.yahoo.com> <20061014183053.GA6898@lucky.net>
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On Sat, Oct 14, 2006 at 09:30:53PM +0300, Valentin Nechayev wrote: > Sat, Oct 14, 2006 at 09:41:01, jan.pfeifer wrote about "Boot2 loading process": > > > I was reading through the architecture handbook (http://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/book.html) about the boot process, and something strange caught my attention. > > > According to the docs boot0 loads only the first record of the partition, that is 512bytes. But boot2 in my 4.11 freebsd has > 7K in size -- what makes sense, considering the amount of things it does and that it links btxld. > Name it "slice", not "partition". > > > So my question is: where does the rest of the boot2 binary is located and how is it loaded ? > > You skipped boot1 from attention. boot2 is loaded by boot1, not boot0. Not according to that piece of architecture documentation that was quoted. www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/book.html#BOOT-BOOT0 It says that boot1 is used only with floppy boots. So, either the question remains or that oiece of doc is incorrect. Cheers, ////jerry > boot1 resides in first block of FreeBSD slice (or whole disk in dedicated > partitioning). It reads MBR, detects first active FreeBSD slice (or first > FreeBSD slice if none active), loads first 8K from its (they are boot1 > + disklabel + boot2) and passes control to boot2. boot2 is placed in > blocks 2-15 of the FreeBSD slice. > > > thanks in advance for any answers! > > > -netch- > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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