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  • To clarify: This is about booting GRUB on the fitlet2, and serial works while GRUB is active, but stops working as soon as GRUB hands over to the kernel, did I understand that correctly? First step would be to read up on the dw-apb-uart module, and see if you can verify its state. Normally 16550A's are port mapped, not memory mapped, and it's possible setserial doesn't work for memory mapped devices (but better verify this). So you may need some other way to set parameters. Commented Oct 27, 2018 at 8:22