[SeaBIOS] Bochs cvs + SeaBIOS git master + FreeDOS = slow load + invalid opcode

[Kevin O'Connor]

On Sun, Jan 10, 2010 at 11:12:11PM +0100, Sebastian Herbszt wrote:
> Kevin O'Connor wrote:
> >On Sun, Jan 10, 2010 at 03:59:22PM +0100, Sebastian Herbszt wrote:
> >>Kevin O'Connor wrote:
> >>>and if I apply the following change, it fixes the problem on bochs:
> >[...]
> >>>-    asm volatile("sti ; hlt ; cli ; cld": : :"memory");
> >>>+    asm volatile("sti ; rep ; nop ; cli ; cld": : :"memory");
> >[...]
> >>>However, I didn't think there was anything wrong with the original
> >>>code.  Am I missing something?
> >>
> >>It should be ok. Your replacement uses PAUSE which can cause VM exits.
> >
> >Yes, but I'd rather not make the change as it causes more cpu load on
> >the host.  Is there a reason why Bochs doesn't work with the original
> >code?
> 
> I did some tracing and noticed the following: