[coreboot] Fwd: reset vector issue

ron minnich rminnich at gmail.com
Thu Nov 7 17:31:18 CET 2013

In terms of what wbinvd does, it makes no sense to execute that
instruction at that point. Write back? To where? Many memory
controllers will hang if you try to use them before they're configured
(personal experience). I believe that set of 16-bit instructions was
written by me for linuxbios ca. 2000, when my understanding of these
details was tenuous, so the wbinvd at that point was probably my
mistake, which Eric corrected in 2004. I tend to expect that's why
there was not much discussion in 2004 -- on the face of it, a wbinvd
at that point just seems wrong.

As for the 2012 discussion, I'd forgotten it completely.

I think the most we could do is a config option to enable this, and it
seems like a bad idea in any event unless we really care about the
z250p. The wbinvd at the POR vector seems like a hack for a buggy

But it's certainly interesting.


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