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https://olimex.wordpress.com/2019/09/19/stm32mp1-olinuxino-development-update-we-managed-to-build-ubuntu-18-04-lts-with-linux-kernel-5-3-now-we-need-your-feedback-on-gpios/
STM32MP1-OLinuXino development update, we managed to build Ubuntu 18.04.LTS with Linux Kernel 5.3. Now we need your feedback on GPIOs