19 Mar
2013
19 Mar
'13
15:21
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. >> 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. Guillaume -- To unsubscribe, e-mail: opensuse-arm+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-arm+owner@opensuse.org