Date: Mon, 8 Jan 2018 13:21:29 -0600 From: Justin Hibbits <jrh29@alumni.cwru.edu> To: Roman Bogorodskiy <novel@freebsd.org> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: Booting an alternate kernel Message-ID: <CAHSQbTAyRSd4uQgV_kMP8AiLYqFMLp%2BYCrBnPPq83vPRTC%2B=Cw@mail.gmail.com> In-Reply-To: <20180108181749.GA3689@kloomba>
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Hi Roman, Not a direct answer to your question, but more addressing what your real problem might be. Are you booting powerpc or powerpc64? Powerpc (32-bit) got updated to 64-bit time_t, which requires everything new. Easiest way to update that is a fresh install (See UPDATING note 20170625). - Justin On Mon, Jan 8, 2018 at 12:17 PM, Roman Bogorodskiy <novel@freebsd.org> wrote: > Hi, > > Recently I upgraded FreeBSD -CURRENT as of mid-2016 to a fresh one (Jan > 6-7 -CURRENT). Of course I didn't read UPDATING and missed 20171125 > entry so it failed to find root. However, when I manually set root to > 'ufs:/dev/ada0s3', it failed to boot because init segfaulted (I did > installkernel but not installworld). > > I decided to boot kernel.old. There's a note here: > > https://www.freebsd.org/platforms/ppc.html#issues > > that tells how to boot a custom kernel, e.g. doing > > 0 > boot hd:loader hd:0 > > It doesn't work for me. > > I figured out that I can proceed to normal boot from the OpenFirmware > shell using > > 0 > boot hd:\ppc\boot1.elf > > But I don't quite understand how to specify invalid partition? > > I tried things like "boot hd:\ppc\boot1.elf hd:4" but it appears to > treat "hd:4" as a loader. > > As far as I understand, boot1.elf source code is: > > https://github.com/freebsd/freebsd/blob/master/stand/powerpc/boot1.chrp/boot1.c > > From what I can see: > > https://github.com/freebsd/freebsd/blob/master/stand/powerpc/boot1.chrp/boot1.c#L414 > > it only allows to define 'path' which is PATH_LOADER "/boot/loader" by > default; and bootpath is set from /chosen bootpath property. > > Would appreciate if somebody could help with the follow: > > * How do I force invalid 'bootpath' so it drops into loader without > loading kernel (or other ways to load kernel.old)? > * Hints how to debug init segfault issue > > Thanks, > > Roman Bogorodskiyhome | help
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