Hi,
For a few years I couldn't use my Banana Pi M3 for any serious work, becaus e I couldn't compile the optimized Linux image for it. Yesterday I've managed to create a Buildroot configuration that allows buil ding of BR image for it. Thanks to use of 4.18.6 kernel the SMP is supporte d and all 8 cores are working. The sources are available on alt.sources:
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Of course I don't give warranty of any kind. It just works for me, and I hoWith bestr regards, Wojtek