BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs
benh at kernel.crashing.org
Tue Jan 25 14:25:14 EST 2005
On Mon, 2005-01-24 at 18:42 +0100, Mikael Pettersson wrote:
> Benjamin Herrenschmidt writes:
> > On Sun, 2005-01-23 at 11:43 +1100, Benjamin Herrenschmidt wrote:
> > > I know about this problem, I'm working on a proper fix. Thanks for your
> > > report.
> > Can you send me the PVR value for both of these CPUs
> > (cat /proc/cpuinfo) ? I can't find right now why they would lock up
> > unless the default idle loop is _not_ run properly, that is for some
> > reason, NAP or DOZE mode end up not beeing enabled. Can you send me
> > your .config as well ?
> === cpuinfo.emac ===
> processor : 0
> cpu : 7447/7457, altivec supported
> clock : 1249MHz
> revision : 1.1 (pvr 8002 0101)
> bogomips : 830.66
> machine : PowerMac6,4
> motherboard : PowerMac6,4 MacRISC3 Power Macintosh
> detected as : 287 (Unknown Intrepid-based)
> pmac flags : 00000000
> L2 cache : 512K unified
> memory : 256MB
> pmac-generation : NewWorld
Ok, it's normal that the Beige G3 doesn't do NAP, and the 7455 cannot do
DOZE, so I suspect it's all normal and my patch fixes it.
However, the eMac should have been doing NAP. Can you check what's up in
arch/ppc/plaform/pmac_feature.c with powersave_nap ? is it set at all ?
It should be visible from userland at /proc/sys/kernel/powersave-nap
and should be set to 1 by default on your machine... unless your cpu
node in the device-tree has the "flush-on-lock" property...
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