All MCUs are basically micro PCs that have SRAM, flash memory and run internal, binary code, so no, it is not possible. It is, however, possible to have everyth

All MCUs are basically micro PCs that have SRAM, flash memory and run internal, binary code, so no, it is not possible. It is, however, possible to have everything open source from bootloader and up, if you don't need advanced graphics or power saving features.