[Bug 191] New: investigate if we can set CPU voltage to 1.8V on 200MHz or less

[bugzilla-daemon at bugzilla.openmoko.org]

http://bugzilla.openmoko.org/cgi-bin/bugzilla/show_bug.cgi?id=191

           Summary: investigate if we can set CPU voltage to 1.8V on 200MHz
                    or less
           Product: Neo1973 Hardware
           Version: GTA01Bv2
          Platform: Neo1973
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Core System
        AssignedTo: sean_chiang at fic.com.tw
        ReportedBy: laforge at openmoko.org


The S3C2410 data sheet only specifies that the 266MHz CPU type requires 2.0V (we
run it at 2.1V), and the 200MHz variant requires 1.8V.

However, if we dynamically change the CPU speed of the 266MHz variant down to
200 (or below), can we safely reconfigure the voltage to 1.8V?  If yes, this
would give us even more power savings than just reducing the clock rate by cpufreq.



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