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Old 10-20-2016, 01:36 PM   #1
SCerovec
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Question overclocking Allwinner A20 on Banana Pi


hi,
I'm trying to clock my B_Pi to more than 960 and no source so far provided a working recipe?

Do I have to modify the driver source and how, or is there a way I "tell it"?

Still looking though.

I'm running -current and 4.8.1 vanilla

I would prefer a /sys/* tip/trick than any recompile?
 
Old 10-21-2016, 05:14 AM   #2
SCerovec
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found this, anyone tried?
 
Old 11-01-2016, 11:14 AM   #3
SCerovec
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Arrow

Code:
$ cd /usr/src/linux
$ diff -p  arch/arm/boot/dts/sun7i-a20-bananapi.dts arch/arm/boot/dts/sun7i-a20-bananapi.dts.old
and got this:
Code:
*** arch/arm/boot/dts/sun7i-a20-bananapi.dts	2016-11-01 16:40:31.492513534 +0100
--- arch/arm/boot/dts/sun7i-a20-bananapi.dts.old	2016-11-01 16:40:57.812513547 +0100
***************
*** 100,107 ****
  	cpu-supply = <&reg_dcdc2>;
  	operating-points = <
  		/* kHz	  uV */
- 	       1056000	1450000
- 	       1008000	1400000
  		960000	1400000
  		912000	1400000
  		864000	1350000
--- 100,105 ----
***************
*** 214,220 ****
  &reg_dcdc2 {
  	regulator-always-on;
  	regulator-min-microvolt = <1000000>;
! 	regulator-max-microvolt = <1450000>;
  	regulator-name = "vdd-cpu";
  };
  
--- 212,218 ----
  &reg_dcdc2 {
  	regulator-always-on;
  	regulator-min-microvolt = <1000000>;
! 	regulator-max-microvolt = <1400000>;
  	regulator-name = "vdd-cpu";
  };
if You copy this to a file called patch you could apply it to the source and just need recompile the dts folder and manually copy sun7i-a20-bananapi.dtb to /boot/dtb/
I recommend preserving the original file though, just in case , and having a heat sink installed couldn't hurt either.

The out of box 960MHz is rock solid and advised for hotter cases and worse cooling than optimal.

GPL applies: no warranty, be advised not to try if any doubt.

Otherwise, enjoy

Last edited by SCerovec; 11-01-2016 at 11:16 AM. Reason: NOTE: it's on 4.8.4 and Slackware-ARM-current
 
  


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a20, allwinner, bananam1, device tree, overclock


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