[coreboot] locking...

[Myles Watson]

> > the way SMP works, the BSP sets up its ram. At that point, the APs can
> > use the BSP ram. That's why APs have a stack in the first place.
> >
> > APs have a working stack when they are setting up their own RAM.
> >
> The way this works on amd64 is that the AP comes up, goes to cache as
> ram, finds it is an AP and goes to sleep again.
> Then it wakes up again in stage2 when the BSP sends an IPI. At this
> point (at least remote) RAM is available. They never set up their own
> ram (in terms of Jedec init, or setting up a ram controller), but only
> have to clear it, in case of ECC memory.

OK.  I'd thought that they each initialized their own RAM, then went to
sleep.  Thanks.

Myles