I've been delving around in open firmware on my Pismo to see if I can control the internal fan, or at least set a better temp. for it to come on at.
In the device tree I've found the via-pmu, and under this is a node called 'power-mgt'. A property of this is called 'thermal-info'. As far as I know this must be related to the temp sensor in the Pismo because the G4 chip I have in it doesn't have the thermal assist temp diode on the chip enabled.
To check that this was specific to the Pismo I found the same 'power-mgt' property on a Digital Audio G4, which had everything listed the same, apart from the 'thermal-info', which was missing.
I've now hit a problem. There are 4 values of data encoded in open firmware for the 'thermal-info'. I believe they are the limits for the fan, as they do not change from boot up o when the computer is definitely toasty.
I can write one value by using the following command:
12345678 encode-int " thermal-info" property
However, I need to be able to write all 4 values - and I don't know the open firmware commands to do this... could anyone help?
Thanks (and sorry for the rambling post),