Date: Fri, 27 Nov 1998 10:14:05 -0800 From: Mike Smith <mike@smith.net.au> To: Andrzej Bialecki <abial@nask.pl> Cc: Mike Smith <mike@smith.net.au>, Christopher Hall <hsw@acm.org>, freebsd-current@FreeBSD.ORG Subject: Re: /boot/loader what to set rootdev to? Message-ID: <199811271814.KAA03531@dingo.cdrom.com> In-Reply-To: Your message of "Fri, 27 Nov 1998 11:13:53 %2B0100." <Pine.BSF.4.02A.9811271108220.16813-100000@korin.warman.org.pl>
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> > > I said: "is it possible to start from _DOS_ _partition_". Not "from under > > > running DOS"... see the difference? > > > > I didn't, no. Yes, it's possible; you can load the kernel and then > > You mean: it's possible with current boot1/boot2 to load kernel from > DOS partition? How? Or, are you saying that /boot/loader is able to do > that? Then again, how? The bootloader can read DOS filesystems. You'll have to work out how to get it into memory without starting DOS; either boot a floppy or rework boot1/boot2 to read DOS filesystems instead of UFS. > Thus far all my attempts at using something other than FreeBSD partition > for $currdev result in nice System halted message. > > BTW. Issuing 'set' with no args should behave as 'show' IMHO, instead of > 'System halted'... It's *very* easy to track this sort of bug down; look at sys/boot/i386/loader/Makefile, and uncomment the "debug me" lines. Also uncomment the '-g' in CFLAGS in src/lib/libstand/Makefile. Rebuild and reinstall libstand and then rebuild and reinstall the bootstrap. In the loader object directory you'll have a file called 'loader.sym'. This contains full debugging information. When you get the register dump and 'System halted' message, look at the value for %eip. Then use objdump --debug --dissassemble-all --line-numbers loader.sym to work out where the problem is. This will print a full dissasembly, but it will also match addresses with source line numbers, which will get you sorted pretty quickly. (Yes, a serial GDB stub would be nice.) > While I'm at it: I think the built-in commands of /boot/loader should > leave their result on Forth stack. Otherwise it's really hard to test if > they were successfull. Many of the builtins should be frontended by Forth code; some can probably be reimplemented largely in Forth (eg. autoboot). Since you're the Forth hacker, not me, I'm happy to take submissions. 8) -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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