BTX loader hangs after version info

[Kostik Belousov]

On Fri, May 23, 2008 at 01:22:55PM +1200, Mark Kirkwood wrote:
> James Seward wrote:
> >Hello,
> >
> >Two days ago I csup'd my desktop at home, which was running RELENG_7
> >from about 7.0-RELEASE time, to bring it up-to-date (still on
> >RELENG_7). I followed my usual buildkernel/world procedure (the usual
> >one) which has worked fine all the way since 5.x. After installing
> >kernel and restarting in single user, it was working fine. However,
> >following installworld it will not boot.
> >
> >It stops immediately after "BTX loader 1.00 BTX version 1.02", but
> >with the cursor on the line *above* the first "B". Nothing futher
> >happens, but the system responds to Ctrl-Alt-Del.
> >
> >I have managed to start it using the install CD and csup'd back to a
> >version just before the commit to BTX that moved it to 1.02 (March
> >18th, I think). However, that version too hangs after "BTX loader 1.00
> >BTX version 1.01".
> >
> >My desktop is currently building RELENG_7_0 to see if that will work,
> >but I won't know that until later as I'm at work and it is at home :)
> >
> >The install CD (BTX 1.00/1.01) boots fine. Nothing else changed on my
> >system between the last successful boot and the unsuccessful one.
> >
> >Any suggestions/advice for what I can try next, or what I can do to
> >help the troubleshooting process?
> >
> >My desktop is an Athlon64 but I am using i386, on an Asus A8V-E Deluxe 
> >board.
> >  
> FWIW - I am seeing this too, on a Supermicro P3TDDE. 7-STABLE src from 
> 28-Feb is fine, but Mar, Apr, May code all hangs after printing "loading 
> /boot/defaults/loader.conf" - presumably reading my /boot/loader.conf?
> 
> Interestingly I can usually get it to boot by escaping to the loader 
> prompt and then just pressing return.
> 
> Oddly some other machines (Supermicro P3TDER and Asus PRO31J Laptop) 
> behave normally with src from Mar->May.
> 
> In all cases the canonical procedure from UPDATING was used (buildworld, 
> kernel, reboot single, mergemaster -p, installworld, delete-old, 
> mergemaster, reboot).
> 
> I happy to help collect some debug info (how do you switch this on for 
> the loader?), tho the machine exhibiting the problem is my workstation 
> (of course)!

Try to install new bootblock.
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