How to adjust the CPU voltage of BPI-M2+

This article introduced how to adjust the VCC-CPUX voltage of the BPI-M2+ with replacing a register of power circuit.

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WARNING!

With any hardware change or component soldering.

You will LOST all warranty of your Banana Pi!

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When I did something system image build and test tasks for the BPI-M2+ with Allwinner H3 before it on stock last year, I have received a Engineer Sample (ES) form SINOVOIP, the manufacturer of Banana Pi.

The Banana Pi Community Forum have received a lot of reports of the too high VCC-CPUX voltage causing horrible heat issue from other developers.

There is a easy to measure the VCC-CPUX voltage of your BPI-M2+.

This picture shows the Test Point (TP: VCPU) of VCC-CPUX.

QQ图片20170426093111

If you get a result like me, Congratulation! You got a ES. (R. I. P. the warranty

 

Okay, the next step is replace the reference register in the feedback circuit of the voltage regulator.

QQ图片20170426093445

QQ图片20170426093459

I have no 0402 register in my component library, so I use the 0805. (I’m sorry for that.

Before:QQ图片20170426093427

After:QQ图片20170426093436

 

And it works. :)

QQ图片20170426094321

 

According to the AW’s whitepaper H3 should work at 1.008GHz max_freq, but I tested ok with the 1.2GHz sys_config. Lucky~

photo_2017-04-25_21-52-13

This is the cpuinfo_cur_freq result of running cpuburn-a7 (https://github.com/ssvb/cpuburn-arm/raw/master/cpuburn-a7.S) and corekeeper.sh.

The idle CPU temperature is about 15 degrees Celsius lower than work at 1.4 V.

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Please credit the source of the article in your repost. Thank you very much.

https://www.nyamoe.com/2017/04/how-to-adjust-the-cpu-volt-of-bpi-m2p-banana-pi/

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