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From Armbian documentation (https://docs.armbian.com/User-Guide_Allwinner_overlays/) Most in-circuit and GPIO based interfaces (SPI, I2C, I2S, …) don’t have a mechanism for detecting and identifying devices connected to the bus, so Linux kernel has to be told explicitly about the device and its configuration details. While Device Tree is a way of describing hardware configuration to the kernel, Device Tree overlays are a way for modifying the DT in order to provide the kernel and kernel drivers with details about external devices or to activate interfaces disabled by default. What do we want? We want to add Device Tree overlays for the onboard interfaces and tested external devices so that they appear in future mainline Armbian images. This means that activating this type of hardware will not require recompiling the Device Tree or will require compiling just the overlay file which will be compatible with future kernel updates. What kind of help do we expect? We want people to participate in making and testing overlays for the hardware that they have. Participation requirements: An A10, A20 or H3 board that can boot the current mainline kernel Serial console adapter for getting the u-boot logs if they are needed Extra SD card to use for booting the nightly/beta images I2C, SPI or I2S (only A10 and A20 based boards since I2S driver is not present on H3 yet) device that you can connect to the board and that requires either generic driver (like SPIdev) or a special driver (available in the mainline kernel), with an exception of custom built boards that don't have commercially available compatible alternatives and devices that don't have in-tree kernel drivers. Some generic Linux knowledge (i.e. how to obtain a dmesg log, how to check file contents) At least a basic understanding of the hardware that you have and how does it integrate into Linux. For example I have no idea how to calibrate a resistive touch screen even if I can write a DT overlay for it. Please note that some hardware limitations (i.e. number of SPI chip selects, missing SPI DMA support) may affect possibility of supporting some devices What overlays are already available? Please check the README in the subdirectory for your SoC in the overlays repository: https://github.com/zador-blood-stained/sunxi-DT-overlays-armbian
In order to make armbian better, we need your help with testing. Why? there are simply too many boards to handle, there are task which can't be automatized, there are bugs which are not seen from our perspective. What kind of tests? booting, user creation, updates, upgrades checking if basic supported functions work: video, audio, network, wireless, AP mode do nasty thing to your board and report. How to test? Download nightly images from here. You want to test image which is not there? Add those two parameters with desired targets to board's config and create a pull request. and / or change to our daily build developer repository: deb http://beta.armbian.com $(lsb_release -cs) main utils $(lsb_release -cs)-desktop Note: you are entering developer area and things will sometimes be completely broken. Don't use this repository in production! When bug is found? * Provide logs with armbianmonitor -u or type as much data as you can. Check if it's not already on the list and if not, add it there, [optional] Open a topic in issues support forum if you think we need to discuss it, [optional] Fix it.
tkaiser posted a topic in Allwinner H2 & H3I added a script lurking around on my disk for some time to Armbian's repo to be hopefully included into future Armbian releases when testing looks good: https://github.com/igorpecovnik/lib/blob/master/scripts/h3consumption Since it's just a script you can include it in your running Armbian installation simply by downloading it from Github -- try it this way please: sudo -s wget -q -O /usr/local/bin/h3consumption "https://raw.githubusercontent.com/igorpecovnik/lib/master/scripts/h3consumption" chmod 755 /usr/local/bin/h3consumption h3consumption -H h3consumption -p The last 2 calls will show the verbose help text along with current settings. This might then look like this: Mode of operation/test: Please read through the description (-H output) first and check also the referenced links Use -p to get currently used settings Use the other switches to modify settings Do not use -p now but instead do a reboot first and then check again -p You might also have a look at /etc/rc.local and /etc/defaults/cpufrequtils to get an idea where the script does things for a better understanding Two examples (will go into details later in different thread): On an Orange Pi Plus 2E 'h3consumption -c 1 -m 1296 -d 408 -g off -e fast' reduces default idle consumption from 1650 mW by 780 mW to just 870 mW On an Orange Pi Lite 'h3consumption -D 132 -c1 -g off -u off' reduces default idle consumption from 1060 mW by 660 mW to just 400 mW (same low consumption running identical settings possible with NanoPi M1, Orange Pi One/PC/PC Plus and maybe the larger boards too when GBit Ethernet PHY can be completely disabled) Please note: the -D switch allows to use DRAM clockspeeds that are way below Allwinner's defaults and what's expected to work ok (since DDR3 shouldn't be clocked lower than 300 MHz and Allwinner used 408 MHz clockspeed as lower limit). While clockspeeds as low as 132 MHz seemed to work reliably in my tests and it should be ok to test these out when having in mind that this is an experimental feature you won't be able to go lower than 408 MHz anyway without a kernel patch (available in post #14 here) with all available official Armbian releases. So you've to either use the kernel .deb I provide in the other thread or wait for a new round of Armbian images (no idea how Igor's plans look like)