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

[Mikael Pettersson]

Benjamin Herrenschmidt writes:
 > 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...

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.

/Mikael