Power Down Modes on Power PC

Power Down Modes on Power PC

Post by Davi » Thu, 22 Apr 2004 23:33:08


Hi,
having VxWorks 5.5 running on MPC 755 and 750 CPU with MPC 107 Mem
Controller.
Tried to use vxPowerModeSet() with different options but i could not measure
any
power saving even the unit has very few load.
Has anybody done this with more success?
Thanks for any help.
David
 
 
 

Power Down Modes on Power PC

Post by Bertram Me » Tue, 27 Apr 2004 17:53:12

On Wed, 21 Apr 2004 15:33:08 +0100, "David"



Hi David,
the vxPowerModeSet() routine stores the power mode in a variable, but
does not modify any of cpu registers. To enter one of the power-down
modes one of the DOZE, NAP or SLEEP bits in HID0 must be set
additionally. VxWorks uses the vxPowerDown() routine to set the POW
bit in the MSR.

Bertram