preliminary 750GX PLL control patch
kevdig at hypersurf.com
Wed Jul 27 03:28:17 EST 2005
I've attached a patch that adds preliminary access to the HID1
register in the 750GX (aka the PLL config register). The patch is
against 2.4.30. It has been lightly tested on a PowerMac 8600 with a
PowerLogix PowerForce 750GX cpu card.
Depending on the values for the pllx_cfg field, this should
work on the 750FX as well ... except for the stuff in idle_6xx.S. Since
there are plenty of people on this list way more smarterer than me I was
hoping someone could answer a question about the powersave modes that
some of the PowerPC processors have:
Since, as I understand it, the clock is shut off to much of the
chip when a powersave mode is engaged does it really buy you that much
to switch to a lower clock speed? Wouldn't you be better off shutting
off the unused PLL?
Also, please note that I am not very experienced creating
patches so please use a backup of your source tree.
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