Date: Fri, 27 Jun 2014 23:04:54 +0200 From: Polytropon <freebsd@edvax.de> To: paul beard <paulbeard@gmail.com> Cc: "questions@freebsd.org" <questions@freebsd.org>, Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> Subject: Re: what should uname -v be telling me here? Message-ID: <20140627230454.041c1baa.freebsd@edvax.de> In-Reply-To: <CAMtcK2rh3tSF6brU_JxA1%2Btzzuv8SsEoHf_oxAhcW95NRRpKjQ@mail.gmail.com> References: <CAMtcK2rBDWwu1=4DbKGB_4kDdi5Fz9Mq3%2Bzf_Ph9jTmrCLZpSg@mail.gmail.com> <44lhsi5ugm.fsf@be-well.ilk.org> <CAMtcK2rZzJPaWBnuZ6s2iZyg4_XjE62JBFTo=iUd%2BT_r4_zoew@mail.gmail.com> <20140627223650.25210a53.freebsd@edvax.de> <CAMtcK2rh3tSF6brU_JxA1%2Btzzuv8SsEoHf_oxAhcW95NRRpKjQ@mail.gmail.com>
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On Fri, 27 Jun 2014 13:57:06 -0700, paul beard wrote: > On Fri, Jun 27, 2014 at 1:36 PM, Polytropon <freebsd@edvax.de> wrote: > > You need to find out where /boot resides (in my case, > > it's on ad4s1a, which is mounted at /) to identify the boot > > device (or to be precise, the device the kernel has been read > > from). > > > I keep thinking this should be something you ought to be able to > discover without being on console. I realize the BIOS can't be > interrogated but if I knew that the active kernel was ad3:/boot/kernel > or ad2:/boot/kernel, it would be useful. Kind of surprised that > doesn't appear anywhere in dmesg or that it can't be read out of > somewhere. There is an entry in /var/log/messages and dmesg: % dmesg | grep "mount root" Trying to mount root from ufs:/dev/ad4s1a But as I said, this is where the root file system has been mounted from. It doesn't _have to be_ the same file system the kernel has been read from (or where the system has been booted from). It's possible to construct a boot chain where the BIOS starts booting from ad2, which reads the kernel from a partition on ad4, and which continues to mount root from ad6 (which is called ada0). Those disks could be identified as disk0, disk1 and disk2 to the BIOS... -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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