ppc32 kernel boot problem (pmu related?)

[Nathan Pilatzke]

On 5/11/06, Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote:
> On Thu, 2006-05-11 at 15:07 -0400, Nathan Pilatzke wrote:
> > I am running an eMac first generation powerpc (700MHz) and the Gentoo
> > distribution.  Kernel 2.6.15 (Gentoo revision 1) is working quite well
> > for me.  A few days ago I compiled 2.6.17-rc3 from the vanilla sources
> > ebuild and am having troubles with the pmu code.
> >
> > I can boot successfully when my config has
> > # CONFIG_ADB_PMU is not set
> > but cannot boot if my config has
> > CONFIG_ADB_PMU=y
>
> What happens when you enable that option ?
>
Sorry, I was a little light on details... I thought this might be a
known problem.  With the pmu option enabled (and early open firmware
messages enabled) I get:

Using PowerMac machine description
Total memory = 640MB; using 2048kB for hash table (at cfe00000)
Linux version 2.6.17-rc3 (root at the_emac) (gcc version 3.4.5 (Gentoo 3.4.5-r1, ss
p-3.4.5-1.0, pie-8.7.9)) #11 Thu May 11 09:53:39 EDT 2006
Found UniNorth memory controller & host bridge @ 0xf8000000 revision: 0x11
Mapped at 0xfdfc0000
Found a Keylargo mac-io controller, rev: 3, mapped at 0xfdf40000
Processor NAP mode on idle enabled.
PowerMac motherboard: eMac
setup_arch: bootmem
Found UniNorth PCI host bridge at 0xf0000000. Firmware bus number: 0->0
Found UniNorth PCI host bridge at 0xf2000000. Firmware bus number: 0->0
Found UniNorth PCI host bridge at 0xf4000000. Firmware bus number: 0->0
via-pmu: Server Mode is disabled
PMU driver v2 initialized for Core99, firmware: 0c
arch: exit
Top of RAM: 0x28000000, Total RAM: 0x28000000
Memory hole size: 0MB
Built 1 zonelists
Kernel command line: root=/dev/sda8 ro video=ofonly root=/dev/sda8 rootdelay=10
resume=/dev/sda9
mpic: Setting up MPIC " MPIC 1   " version 1.2 at 80040000, max 4 CPUs
mpic: ISU size: 64, shift: 6, mask: 3f
mpic: Initializing for 64 sources
PID hash table entries: 4096 (order: 12, 16384 bytes)
time_init: decrementer frequency = 24.913389 MHz
time_init: processor frequency   = 700.000000 MHz

and then the machine freezes and requires a power cycle to restart.
Without that option enabled I get this:

 PowerMac motherboard: eMac
-setup_arch: bootmem
 Found UniNorth PCI host bridge at 0xf0000000. Firmware bus number: 0->0
 Found UniNorth PCI host bridge at 0xf2000000. Firmware bus number: 0->0
 Found UniNorth PCI host bridge at 0xf4000000. Firmware bus number: 0->0
-via-pmu: Server Mode is disabled
-PMU driver v2 initialized for Core99, firmware: 0c
-arch: exit
+WARNING ! Your machine is PMU-based but your kernel
+          wasn't compiled with CONFIG_ADB_PMU option !
 Top of RAM: 0x28000000, Total RAM: 0x28000000
 Memory hole size: 0MB
+On node 0 totalpages: 163840
+  DMA zone: 163840 pages, LIFO batch:31
 Built 1 zonelists
 Kernel command line: root=/dev/sda8 ro video=ofonly root=/dev/sda8
rootdelay=10
resume=/dev/sda9
 mpic: Setting up MPIC " MPIC 1   " version 1.2 at 80040000, max 4 CPUs
 mpic: ISU size: 64, shift: 6, mask: 3f
 mpic: Initializing for 64 sources
 PID hash table entries: 4096 (order: 12, 16384 bytes)
 time_init: decrementer frequency = 24.913389 MHz
 time_init: processor frequency   = 700.000000 MHz
+Console: colour dummy device 80x25
+Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
...

and it continues booting as normal.  As a side note it should be known
that I could not coerce the PowerMac ALSA sound driver to compile
without the PMU enabled either, so there probably should be a config
dependency on it if that is the case.

Anything else I can do?