From owner-freebsd-arch  Fri Mar  8 21: 8:39 2002
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Date: Sat, 9 Mar 2002 16:08:57 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Poul-Henning Kamp <phk@critter.freebsd.dk>
Cc: Luigi Rizzo <rizzo@icir.org>, Garance A Drosihn <drosih@rpi.edu>,
	<arch@FreeBSD.ORG>
Subject: Re: Proposed patch: kern.bootdev* sysctl variables 
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On Fri, 8 Mar 2002, Poul-Henning Kamp wrote:

> In message <20020308102656.A9076@iguana.icir.org>, Luigi Rizzo writes:
> >you can get the correct major/minor numbers for the device
> >from kern/bootdev:
> >
> >	# sysctl kern.bootdev
> >	kern.bootdev: 2687500318
> >
> >but the mapping to names of course is totally user-dependent.
>
> Uhm devname(3) ?

No.  kern.bootdev (if it actually a copy of the boot variable) is not
a udev_t:

u_long	bootdev = 0;		/* not a dev_t - encoding is different */

E.g., 2687500318 is 0xA030001E; see <sys/reboot.h> and old versions of
i386/autoconf.c for how to decode this correctly.  I still use my version
of the old versions because I don't use /boot/loader and boot device
handling has regressed since FreeBSD-2 if /boot/loader is not used.

Bruce


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