Active slice, only for a next boot

[Chris Rees]

On 27 May 2011 17:47, <rank1seeker at gmail.com> wrote:
>
> ----- Original Message -----
> From: Alexander Best <arundel at freebsd.org>
> To: rank1seeker at gmail.com
> Cc: hackers at freebsd.org
> Date: Fri, 27 May 2011 13:47:54 +0000
> Subject: Re: Active slice, only for a next boot
>
> > On Fri May 27 11, rank1seeker at gmail.com wrote:
> > > Idea is ...
> > > I have i.e; 3 slices, of which first is active.
> > > Now I wana set slice 2 active, but only for a one/next boot.
> > > Once slice 2 is booted and system is shutdown or rebooted, once again,
> first slice is active and booted, without user's intervention.
> > >
> > > Is this possible or should be implemented?
> >
> > take a look at the gpart(8) manual, expecially the ATTRIBUTES section.
if
> you
> > are running with a GPT scheme you can use the "bootonce" attribute to do
> > exactly what you asked for.
> >
> > cheers.
> > alex
> >
>
> Thanls, but I need it for MBR.
>
> Domagoj S.

MBR has only a one-bit wide field for active status. You'll need logic in
the first boot to change the flag, perhaps an fdisk statement.

Chris