How to retrieve the "bootpath" variable in a running FreeBSD ?

[Marius Strobl]

On Sun, Jan 13, 2013 at 01:27:36AM +0100, Olivier Cochard-Labbé wrote:
> On Sat, Jan 12, 2013 at 11:50 PM, Hiroki Sato <hrs at freebsd.org> wrote:
> >
> >  Try:
> >
> >  % kenv currdev
> >
> 
> Thanks a lot's !
> 
> Now my eeprom is correctly updated, just a last bug to fix.
> After updating the eeprom from FreeBSD I need to issue a cold-reboot
> for eeprom changes being applied (poweroff+poweron or "boot" command
> in OBP): A simple "reboot" from SSH console is not enough.
> I don't know if it's my old Sun Blade 150 that have this problem or if
> it's a normal sparc behavior.
> 

Uhm, that's tricky. I haven't implemented that part but AFAICT, the
current behavior of rebooting from the previously used bootpath
rather than from what is specified via boot-device (now) is on
purpose and actually I make heavy use of it. Normally, I boot my
machines from disk set via boot-device, except for kernel development
which I typically use netbooting for. In order to do so, I interrupt
the boot process and boot via `boot net`. It's very convenient that
this sticks across reboots until one power cycles the machine or
explicitly boots from disk again without having to fiddle with
boot-device.
The behavior you are asking for can also be implemented but I can't
think of a proper logic for determining what to do when boot-device
and bootpath disagree and I don't want to get rid of the current one :)
If you need that alternate behavior the best way forward seems to
be to add a switch for it to reboot(8).

Marius