Date: Sun, 15 Dec 2002 20:31:45 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Peter Wemm <peter@wemm.org> Cc: Poul-Henning Kamp <phk@FreeBSD.org>, <cvs-committers@FreeBSD.org>, <cvs-all@FreeBSD.org> Subject: Re: cvs commit: src/sys/boot/i386/boot2 Makefile boot1.s Message-ID: <20021215200548.T10706-100000@gamplex.bde.org> In-Reply-To: <20021215005215.2476D2A7EA@canning.wemm.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, 14 Dec 2002, Peter Wemm wrote: > Poul-Henning Kamp wrote: > > Modified files: > > sys/boot/i386/boot2 Makefile boot1.s > > Log: > > Employ the unused bytes after the disklabel in the second sector. This mak > es > > it possible to make UFS1_ONLY and UFS2_ONLY versions which fit inside the > > traditional 16 sectors. > > > > UFS1_AND_UFS2 still needs another 150 bytes to work, and that is probably > > not within our reach, ever. > > That sounds like a challenge! :-) Yeah, should be easy :-). > http://people.freebsd.org/~peter/boot2.diff > > That is a WIP and COMPLETELY UNTESTED patch to turn on UFS1_AND_UFS2 > and it ends up with 7 bytes free. I wouldn't install this on anything > but a spare floppy disk yet. Please remove the alignment hacks (Makefile rev.1.25) while you are there. Breakage of -[fm]align-* seems to have been fixed in gcc, so the hacks make no difference except to reduce the size of boot2.o's data by 3 bytes (I think the 3 bytes is wasted at link time). > I have a couple of nastier versions that have ~30+ bytes free but > I'm pretty sure I broke the pathname lookups there. And for that matter, > I'm not even sure if -fomit-frame-pointer is compatable with -mrtd... If > not, oh well. :-) It should be compatible. -mrtd and -fomit-frame-pointer are often (space) pessimizations. It's interesting that they are both optimizations for boot2. I use my version biosboot and don't really care about this except I had to do similar hacks to debloat the ufs1 support so that it fits again. I haven't tried fitting ufs2. biosboot has more features so it has 1-2K less to spare for ufs2 than boot2 did. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20021215200548.T10706-100000>