Re: BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs

On Wed, 2005-01-26 at 11:02 +0100, Mikael Pettersson wrote:

Benjamin Herrenschmidt writes:
 > On Tue, 2005-01-25 at 09:56 +0100, Mikael Pettersson wrote:
 > 
 > > On the eMac:
 > > /proc/sys/kernel/powersave-nap exists and contains "0".
 > > /proc/device-tree/cpus/PowerPC,G4/flush-on-lock exists as an empty file.
 > 
 > Ok, that is weird... so for some reason, Apple decided not to allow the
 > eMac to do NAP mode, and thus to power manage the CPU when idle...

I assumed it was due to the UniNorth issue that pmac_feature.c mentions.

Not clear. I would expect the eMac to run with a fairly recent revision
of UniNorth with no issue, and since it's not an SMP machine there
should be no problem...

On the other hand, I also suspect that the whole NAP thing does have a
small impact on performances, so that may be the reason they chose not
to do it on this HW...

Ben.