I think you're worrying too much about the little things. If you do not want to use 300Mhz frequency, then use a CPU governor that uses something else.
On Tue, Sep 22, 2015 at 8:55 AM, Mark Ruys <[email protected]> wrote: > According to http://www.ti.com/lit/ds/sprs717h/sprs717h.pdf, the AM3358 > supports three frequencies: 1000, 800, and 600 MHz (table 3-1). > The BeagleBone Black is equipped with the SoC am3358bzcz100. According to > paragraph 5.4, the so called Operating Performance Points for this SoC are > (table 5-7): > > VDD_MPU OPP ARM (A8) > ------------- -------- > Nitro 1000 MHz > Turbo 800 MHz > OPP100 600 MHz > OPP50 300 MHz > > Some peripherals and features have limited support when the device is > operating in OPP50 (paragraph 7.3), like unsupported DDR3 (much to my > believe the BBB uses) and reduced DDR2 performance. > > Then 300 MHz runs the BeagleBone in a limited way? This is not what we've > seen here. So I'm still confused why the AM3358 does not support 300 MHz > (and BTW the AM3352 does, 300, 600, and 1000). > > > Mark > > > Op maandag 21 september 2015 21:00:40 UTC+2 schreef William Hermans: >> >> I do not know the technical reasons how, but I do know that 300Mhz has >> been the low end of cpufreq-set for a good long time now. Which is what the >> ondemand governor uses when CPU load is less than ~66%. Otherwise the >> processor can go up to 1Ghz when CPU load is greater than ~66%. >> >> Anyway, I've been using ondemand mostly for well over a year I believe. >> No ill effects on my circuitco A5A, or element 14 REV C's( we have 2 A5A's >> and 3 REV C's ). >> >> On Mon, Sep 21, 2015 at 11:44 AM, Mark Ruys <[email protected]> wrote: >> >>> I'm confused how the BBB can run on 300 MHz. >>> >>> The BeagleBone has a AM3358 processor, and according to >>> http://www.ti.com/lit/ds/symlink/am3358.pdf, it supports 600, 800, and >>> 1000 Mhz, not 300 MHz. Still, using tools like cpufreq-set, you can set the >>> frequency to 300. The power usage drops indeed and the CPU power is lowered >>> pro rato. >>> >>> Does someone what happens? Is 300 a frequency which is unsupported by >>> TI's AM3358? If so, are there any risks? >>> >>> Thanks, Mark >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
