I have this pretty nasty problem when trying to boot up a fresh
openSuSE DVD on a PowerMac G5: the kernel by default does not have
CONFIG_WINDFARM_PM72 enabled, with the effect that the cooling
is not functioning.
The BIOS on the PowerMac G5 reacts to this by, after a grace
period when the BIOS has waited for the OS to take over, increasing
the fan speeds so it sounds like an airplane is in the room, and
after another grace period simply cutting the power to the
machine. This is done not beacuse the cooling is not working, but
because the BIOS is not recieving handover of cooling from the
OS, so it panics and give up. The problem has been reported by
Linux users online.
Needless to say, this makes it impossible to install the OS
before the machine turns itself off.
The g5_defconfig looks like this:
CONFIG_PMAC_SMU=y
CONFIG_WINDFARM=y
CONFIG_WINDFARM_PM81=y
CONFIG_WINDFARM_PM91=y
CONFIG_WINDFARM_PM112=y
CONFIG_WINDFARM_PM121=y
Notably PM72 is missing, making the PowerMac G5 fail.
The defconfig is not the right place to do this: it should be
done by default when selecting Mac support for PPC/PPC64 and
especially for the Macs CPUfreq driver. We select SMU by default
for PPC_PMAC64, WINDFARM by default on PPC_PMAC and all the
WINDFARM thermal managers by default if CPU_FREQ_PMAC64 is
selected.
I think this will make install images work in the G5 Macs.
Cc: stable(a)vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij(a)linaro.org>
---
drivers/macintosh/Kconfig | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig
index 97a420c11eed..d7186d8f30a9 100644
--- a/drivers/macintosh/Kconfig
+++ b/drivers/macintosh/Kconfig
@@ -101,6 +101,7 @@ config ADB_PMU_LED_DISK
config PMAC_SMU
bool "Support for SMU based PowerMacs"
depends on PPC_PMAC64
+ default PPC_PMAC64
help
This option adds support for the newer G5 iMacs and PowerMacs based
on the "SMU" system control chip which replaces the old PMU.
@@ -194,11 +195,13 @@ config THERM_ADT746X
config WINDFARM
tristate "New PowerMac thermal control infrastructure"
depends on PPC
+ default PPC_PMAC
config WINDFARM_PM81
tristate "Support for thermal management on iMac G5"
depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && PMAC_SMU
select I2C_POWERMAC
+ default CPU_FREQ_PMAC64
help
This driver provides thermal control for the iMacG5
@@ -206,6 +209,7 @@ config WINDFARM_PM72
tristate "Support for thermal management on PowerMac G5 (AGP)"
depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && ADB_PMU
select I2C_POWERMAC
+ default CPU_FREQ_PMAC64
help
This driver provides thermal control for the PowerMac G5
"AGP" variants (PowerMac 7,2 and 7,3)
@@ -214,6 +218,7 @@ config WINDFARM_RM31
tristate "Support for thermal management on Xserve G5"
depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && ADB_PMU
select I2C_POWERMAC
+ default CPU_FREQ_PMAC64
help
This driver provides thermal control for the Xserve G5
(RackMac3,1)
@@ -222,6 +227,7 @@ config WINDFARM_PM91
tristate "Support for thermal management on PowerMac9,1"
depends on WINDFARM && I2C && CPU_FREQ_PMAC64 && PMAC_SMU
select I2C_POWERMAC
+ default CPU_FREQ_PMAC64
help
This driver provides thermal control for the PowerMac9,1
which is the recent (SMU based) single CPU desktop G5
--
2.9.4
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