Tomash

The problem: I want to run my Banana Pi M2 Zero from a battery / powerbank setup. It works like a charm from a beefy powerbank capable of consistent 2A output [1], even with added 5" LCD screen to power at the same time and wireless keyboard transmitter. BUT it does hang up hard, I guess due to undervoltage, when powered from a smaller, weaker powerbank with a single 18650 cell and max output of about 500mA (theoretically 1A but let's underestimate, I'll try to measure it with an oscilloscope). Armbian with 4.19 kernel and Ubuntu 18.04 (but booting in text mode, without any GU

Thanks, here it is: https://github.com/armbian/build/pull/1503 Although it's a bit premature, I haven't tested DEV build yet.

Spot on, disabling this patch (by touch-ing an empty file in userpatches) fixed the issue, I've got cpufreq information and the frequency does change. stress results in dropping the frequency to 800Mhz when the temperature reaches 80 C, perfect. At least with NEXT, I'll build and test with DEV kernel soon. Should my entire PR be just a removal of this patch file altogether?

It's the same in 4.19. /sys/devices/system/cpu/cpufreq/ is an empty directory. How can I help in debugging and fixing it?

Good tip, thanks, I'll go ahead with 4.19 for now.

Build on new kernel (5.1), Ubuntu 18.04. No cpufreq information (0 MHz in htop etc.) also means there's no working frequency scaling. Which for Allwinner H2+ (Banana Pi M2 Zero) means quick hard-hang due to overheating whenever I compile anything non trivial, unless I point a USB Fan on the CPU (which already got a heatsink). Is there any chance of getting cpufreq and dvfs to work?

Turns our dr_mode was "otg", changed it to host and usb peripherals work now, great!

Can I only disable it at image build time, or can I remove this module from a working image and have a working OTG? Thanks for the CSC. I'm never again buying any SBC from Banana brand, though

After some frustration with poor support for Banana Pi M2 Zero board by the manufacturer and not a very active community on Banana Pi forums, I stumbled upon Armbian and found out there's a CSC for building Armbian for this board. And because I'm having issues with wifi on the images found on Banana forums, with all images being old and based on kernel 3.4 -- wifi disconnects with some weird firmware errors in dmesg after about 3 minutes of running, requiring reboot to get back up again -- I was happy to read Armbian runs fine on BPI-M2Z for some folks here. So I did the build process, tw