Date: Tue, 19 Mar 2002 04:50:57 +0000 (UTC) From: Carlos Antonio Ruggiero <toto@sdf.lonestar.org> To: "Brian T.Schellenberger" <bts@babbleon.org> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: Re: booting from extended slice Message-ID: <Pine.NEB.4.33.0203190407360.13962-100000@sdf.lonestar.org> In-Reply-To: <20020319024407.751EFBA05@i8k.babbleon.org>
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On Mon, 18 Mar 2002, Brian T.Schellenberger wrote: > Date: Mon, 18 Mar 2002 21:44:07 -0500 > From: Brian T.Schellenberger <bts@babbleon.org> > To: Carlos Antonio Ruggiero <toto@sdf.lonestar.org>, > freebsd-hackers@FreeBSD.ORG > Subject: Re: booting from extended slice > > On Monday 18 March 2002 08:48 pm, Carlos Antonio Ruggiero wrote: > | Hi, > | > | I'm trying to boot from an extended partition (slice). From > | what I have read in the archives, FreeBSD doesn't support this. I > | managed to boot the 4.5R kernel by hacking boot2.c to point directly > | to the start of the extended partition..It does work if I boot the > | kernel directly but if I boot the loader, it does not see the extended > | slice. In fact, lsdev seems to see SOME extended slices but not the > | others... > | > | My question: is this a normal behaviour of the loader? a bug? some kind > | of limitation? > > What good will it do you if do boot it? FreeBSD doesn't support UFS in > extended partitions anyway. I guess you could use ext2 or FAT32 partitions > as your paritions for the sysem (ext2 would presumably work a lot better), > but why do you want to do such a thing? You'd be working in a very > unsupported environemnt. I don't think you're right here. FreeBSD does seem to support FFS in extended slices. And please note that, right now, I am able to boot the 4.5R kernel from FFS-ad0s10a (which is hda10 in linux), and use it normally I was even able to make buildworld in it! X + KDE works fine, etc.. The only thing is that I cannot mount linprocfs, probably because I am booting directly into the kernel, without the loader (I am guessing here :-) You're probably refering to the fact that sysinstall doesn't allow you to edit slices inside an extended slice which is true, but note that sysintall in wizard mode shows my messy partition table quite correctly. Disklabeling an extended slice, however, is quite a pain, without the help of sysinstall. > > I consider this a major FreeBSD weakness but other O/S's don't care so much > about primary vs. extended and FreeBSD only needs one partition--it'll > subdivide the rest. > I am using quite a few OSs and NONE of them are comfortable with extended partitions, except linux. Windoze sees them but do not boot from them. FreeBSD, which is my favorite OS since the days of 386BSD0.1, seems to have everything to support them except the boot blocks (boot1 boot2 and loader) and the installation script (/stand/sysinstall). > What are the "73" type partitions? Immovable? > I use Sstem commander to boot the different OSs and, when I boot linux, I have to hide a few other partitions (linux loves to format partition types 0x82 as swap and Solaris FS uses this same type number). I think 73 is the way System Commander changes the SCO Openserver and Unixware partition types to "HIDE" them. They are in fact type 0x63. > | > | Some info on the hard disk: > | > | > | Linux fdisk reports: > | > | > | Command (m for help): > | Disk /dev/hda: 255 heads, 63 sectors, 9732 cylinders > | Units = cylinders of 16065 * 512 bytes > | > | Device Boot Start End Blocks Id System > | /dev/hda1 1 230 1847443+ 6 FAT16 > | /dev/hda2 231 395 1325362+ 73 Unknown > | /dev/hda3 396 560 1325362+ 73 Unknown > | /dev/hda4 * 561 9731 73666057+ 5 Extended > | /dev/hda5 * 561 1023 3719016 83 Linux > | /dev/hda6 1024 1087 514048+ 82 Linux swap > | /dev/hda7 1088 2235 9221278+ 83 Linux > | /dev/hda8 2236 2482 1983996 b Win95 FAT32 > | /dev/hda9 * 2483 3056 4610623+ 83 Linux > | /dev/hda10 * 3057 3630 4610623+ a5 BSD/386 > | /dev/hda11 * 3631 4205 4618624+ 83 Linux > | /dev/hda12 4206 4460 2048256 6 FAT16 > | > | Command (m for help): Brian, this IS FREEBSD 4.5 now: > | > | I trying to boot from hda10 > | > | and /stand/sysinstall (in wizard mode) says: > | > | --==##==-- > | Debug_Disk(ad0) flags=0 bios_geom=9732/255/63 = 156344580 > | boot1=0x0, boot2=0x0, bootmgr=0x0 > | --> 0x82e5480 0 156355584 156355583 ad0 whole 0x00 > | --> 0x82e54c0 0 63 62 - unused 0x00 > | --> 0x82e5500 63 3694887 3694949 ad0s1 fat 0x06 > | --> 0x82e5540 3694950 2650725 6345674 ad0s2 unknown 0x63 > | --> 0x82e55c0 6345675 2650725 8996399 ad0s3 unknown 0x63 > | --> 0x82e5600 8996400 147332115 156328514 ad0s4 extended 0x05 > | --> 0x82e5640 8996400 63 8996462 - unused 0x00 > | --> 0x82e5580 8996463 7438032 16434494 ad0s5 unknown 0x83 > | --> 0x82e56c0 16434495 63 16434557 - unused 0x00 > | --> 0x82e5700 16434558 1028097 17462654 ad0s6 unknown 0x82 > | --> 0x82e5740 17462655 63 17462717 - unused 0x00 > | --> 0x82e5780 17462718 18442557 35905274 ad0s7 unknown 0x83 > | --> 0x82e57c0 35905275 63 35905337 - unused 0x00 > | --> 0x82e5800 35905338 3967992 39873329 ad0s8 fat 0x0b > | --> 0x82e5840 39873330 63 39873392 - unused 0x00 > | --> 0x82e5880 39873393 9221247 49094639 ad0s9 unknown 0x83 > | --> 0x82e58c0 49094640 63 49094702 - unused 0x00 > | --> 0x82e5900 49094703 9221247 58315949 ad0s10 freebsd 0xa5 > | --> 0x82e5940 49094703 819315 49914017 ad0s10b part 0x01 > | --> 0x82e59c0 49914018 8401932 58315949 ad0s10a part 0x07 > | --> 0x82e5980 58315950 126 58316075 - unused 0x00 > | --> 0x82e5a00 58316076 9237249 67553324 ad0s11 unknown 0x83 > | --> 0x82e5a40 67553325 63 67553387 - unused 0x00 > | --> 0x82e5a80 67553388 4096512 71649899 ad0s12 fat 0x06 > | --> 0x82e5ac0 71649900 84678615 156328514 - unused 0x00 > | --> 0x82e5680 156328515 27069 156355583 - unused 0x00 > | ad0> > | > | lsdev says: > | .... > | disk1s5:ext2fs > | disk1s7: Linux swap (shouldn't it be s6? s7 is ext2fs...) > | > | Thanks for any help/pointers.. > | > | Toto > | toto@sdf.lonestar.org > | > | To Unsubscribe: send mail to majordomo@FreeBSD.org > | with "unsubscribe freebsd-hackers" in the body of the message > > -- > Brian T. Schellenberger . . . . . . . bts@wnt.sas.com (work) > Brian, the man from Babble-On . . . . bts@babbleon.org (personal) > ME --> http://www.babbleon.org > http://www.eff.org <-- GOOD GUYS --> http://www.programming-freedom.org > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > toto@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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