Re: Open Firmware on Pismo
Re: Open Firmware on Pismo
- Subject: Re: Open Firmware on Pismo
- From: James Little <email@hidden>
- Date: Wed, 1 Oct 2008 22:10:34 +0000 (GMT)
Hi,
Thanks very much. Using the commands, after amending the settings for thermal-info I got the fan to turn on straight after booting, by setting them to 01010200 00000000 01010200 00000000.
With the open firmware dump below of the values for via-pmu / power-mgt could anyone explain what the values present could likely be. i.e. are the set of 4 hex values likely to be 2 sets of values, or 4 separate ones?
I decoded each of the hex values and got 16843264 for hex 01010200 and 1213468963 for hex 48434843. I think these refer to temperature values (perhaps F?).
ff918050: /pci@f2000000/mac-io@17/via-pmu@16000/power-mgt
compatible 7669612d 706d752d 393900.. ........ "via-pmu-99"
device_type 706f7765 722d6d67 7400.... ........ "power-mgt"
max-aux-power 00000000 ........ ........ ........ ....
name 706f7765 722d6d67 7400.... ........ "power-mgt"
prim-info 000000ff 00000060 00003e80 00017fb5 .......`..>.....
0010: 0000d607 00000000 00021300 46000220 ............F..
0020: 101400.. ........ ........ ........ ...
registry-name 65787469 6e742d67 70696f31 00...... extint-gpio1.
thermal-info 01010200 00000000 48434843 00000000 ........HCHC....
Any knowledge people may have on this and Open Firmware properties would be much appreciated.
Thanks,
James.
----- Original Message ----
From: Josh de Cesare <email@hidden>
To: James Little <email@hidden>
Cc: email@hidden
Sent: Wednesday, 1 October, 2008 2:55:00 PM
Subject: Re: Open Firmware on Pismo
James,
You can build up properties with encode+.
The following code:
0 encode-int 1 encode-int encode+ 2 encode-int encode+ 3 encode-int
encode+
should leave on the stack the length 4*4 and address of 16 bytes
containing the long words 0, 1, 2, and 3.
Josh
On Oct 1, 2008, at 4:16 AM, James Little wrote:
> Hi,
>
> I hope this is not too off-topic:
>
> 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:
>
> [code]12345678 encode-int " thermal-info" property[/code]
>
> 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),
>
> James.
>
>
>
>
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