19 Mar
2013
19 Mar
'13
15:36
On 16:21-20130319, Guillaume Gardet wrote: > > Le 19/03/2013 16:02, Nishanth Menon a écrit : > >On 15:42-20130319, Guillaume Gardet wrote: > >>Le 19/03/2013 15:38, Nishanth Menon a écrit : > >>>On 10:22-20130319, Guillaume Gardet wrote: > >>>>Hi, > >>>> > >>>>Le 19/03/2013 08:36, gary a écrit : > >>>>>I can't seem to get past 800MHz on the Beagleboard XM cpu clock, though the part is rated for 1GHz. The 800MHz limit can't be exceeded. Anyway around this? > >>>>Have a look here: > >>>>* [0] : http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/mach-omap2/clock.c > >>>>* [1] : http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/mach-omap2/opp3xxx_data.c > >>>> > >>>>In [0], you can modify the following lines: > >>>> if (mpurate < 1000) > >>>> mpurate *= 1000000; > >>>>with: > >>>> if (mpurate <= 1000) > >>>> mpurate *= 1000000; > >>>> > >>>>In [1] : > >>>>In omap36xx_opp_def_list[], OPP-Turbo and OPP-SB are disabled for MPU and IVA (DSP). > >>>> > >>>>I think it is like this in the kernel because some of TI DM3730 (ARM SoC used in BB xM) are 800 MHz and others are 1 GHz. Are all Beagleboard xM 1GHz? I do not know. > >>>We need support of Adaptive Body Bias (ABB) and Automatic Voltage > >>>Scaling (AVS) to support 1GHz completely. ABB is mandatory and the > >>>support is not available upstream. > >>Interesting. Is there any patch available around to enable it? > >There was an RFC patch which steve did mention in the passing that it > >had'nt worked on overo > >http://marc.info/?l=linux-arm-kernel&m=135040721419073&w=2 > >I have'nt dug there yet. We are working to move to DTS based solution - > >hopefully we'd have ABB as part of that. > > Ok. Is there a place to know the support status of device tree boards? For beagleboard (xM) for example. Nothing other than what you'd find in arch/arm/boot/dts - there is unfortunately no elinux.org or equivalent wiki anyone seems to be maintaining :( > > >>Did you notice that CPU bogomips of 3.7* kernel felled down? Any idea why? > >I have'nt noticed that yet :( -> might be good to provide your > >observations on linux-omap@vger.kernel.org > > > > Done right now. Thanks. -- Regards, Nishanth Menon -- To unsubscribe, e-mail: opensuse-arm+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-arm+owner@opensuse.org