AMD64: LDTSTOP vs hard reset
Eric W. Biederman
ebiederman at lnxi.com
Thu Nov 20 22:15:01 CET 2003
Stefan Reinauer <stepan at suse.de> writes:
> In addition to lowering the number of resets it would also be possible
> to use an LDTSTOP (as I implemented it in older versions of the CVS)
> at least when doing the hypertransport link changes.
> I know that this does not work with some preproduction CPUs, but I don't
> think that would really matter. BUT: Could we get rid of all CPU resets
> when doing an LDTSTOP assertion (It's a lot quicker than a hard reset)
> or would we still need to reset the CPU for some other reasons?
When I was working with it I remember seeing some additional remaining
errata with regards to LDTSTOP. So I decided not to mess with it.
There does seem to be a big delay in the phase that finds the rom chip
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