Date: Thu, 01 Jul 2004 08:43:53 +0100 From: "Richard P. Williamson" <richard.williamson@u4eatech.com> To: epilogue <epilogue@allstream.net>, freebsd-questions@freebsd.org Subject: Re: failing to boot from mfsroot.gz Message-ID: <6.1.1.1.2.20040701083638.027e4310@cygnus> In-Reply-To: <20040630122433.27d99453@localhost> References: <6.1.1.1.2.20040630135552.0a8deff8@cygnus> <20040630122433.27d99453@localhost>
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At 17:24 30/06/2004. epilogue had this to say: >On Wed, 30 Jun 2004 14:11:07 +0100 >"Richard P. Williamson" <richard.williamson@u4eatech.com> wrote: > >> Hello all, >> >> I have a 4.8 system that booted from flash using a kernel.gz and >> mfsroot.gz. The ethernet parts were not fully supported by the fxp driver >> in 4.8, so I was testing 4.10 to see if they were with that version of >> the OS. >> >> I've replace the kernel.gz with a 4.10 version, and the mfsroot.gz >> is built using 4.10 objects. If I try to boot it, this is what I >> get: >> >> ... >> md0: Preloaded mfs_root "/mfsroot> 50331648 bytes at 0xc02b2794 >> md1: malloc disk >> ... >> sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 in isa0 >> sio0: type 16550A, console >> sio1 at port 0x2f8-0x2ff irq 3 on isa0 >> sio1: type 16550A >> vga0: <Generic ISA VGA> at port 0x3b0-0x3bb iomem 0xb0000-0xb7ffff on >> isa0 ad0: 30MB <SanDisk SDCFB-32> [490/4/32] at ata0-master PI01 >> Mounting root from ufs:/dev/md0c >> >> And then nothing. Nada. Zip. >> >> No kernel panic message, no prompt, nothing. >> >> Which leaves me in a bit of a pickle as to what to try. >> >> If I use a 4.10 kernel with a 4.8 mfsroot.gz, it boots, >> but tells me that proc is out of sync with the kernel. > >If i get you correctly, you're trying to run a 4.10 kernel on a 4.8 >system. (?) That'd be stoopid. No, I'm trying to run a 4.10 kernel with a 4.10 mfsroot.gz. But nothing happens. The kernel inflates the mfsroot.gz into md0, configures itself, and then attempts to mount the root filesystem on /dev/md0c . And then that's it. No further messages on the console, no panic, no nothing. When I run a 4.8 kernel with a 4.8 system, all ok. When I (accidently) ran the 4.10 kernel with the 4.8 mfsroot.gz, it ran (marginally), while complaining about things like proc size mismatch. But it did come up. >if i've misunderstand your intention, apologies. no worries. My second paragraph may have been unclear ;> What I'm looking for is 'debug methodologies', ie what can I do to try and trace where it is falling over. Assume I'm limited to printf. Is there any way to enable bizarre debugging support in the booting kernel, on a headless, embedded device... Thanks for responding, rip
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