[coreboot] [h8dme-fam10] acquiring coreboot skills from scratch somewhat daunting

Arne Georg Gleditsch arne.gleditsch at numascale.com
Thu Jun 10 22:48:17 CEST 2010

Joe Korty <joe.korty at ccur.com> writes:
> Hi Arne,
> First first applied only the memset change then I applied the whole patch.
> The memset-only change did indeed speed up the memset.  It is now
> instantaeous.  The speedup seems too great to me, it implies that I've
> no-oped memset somehow.

Well, RAMTOP is what, 16MB?  DDR2 (peak) transfer rates are 100-500
times that per second.  There's reason that memset operation should be
taking any noticeable amount of time.

> Then I applied the whole patch.  I had to change the "#if CONFIG_ARCH_X86"
> to "#if 1" as CONFIG_ARCH_X86 doesn't seem to be set.  With that single
> change to your patch I see a speed-up to 'no delays, anywhere'; but now
> the execution patch is quite a bit different, we are in a warm reset
> infinite loop.

That's interesting.  What's happening at the end there, before the warm


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