On Mon, Sep 05, 2016 at 05:18:40PM +0100, Matt Redfearn wrote: > If the rb532 machine is compiled without CONFIG_SERIAL_8250, the > following linker error occurs > > arch/mips/built-in.o: In function `setup_serial_port': > (.init.text+0x20c): undefined reference to `early_serial_setup' > > Fix this by wrapping registration of the rb532 uart in an ifdef > CONFIG_SERIAL_8250. This will still fail if CONFIG_SERIAL_8250 = m. RB532 should be rewritten to use earl console rather than early_serial_setup similar to https://git.linux-mips.org/cgit/ralf/linux.git/commit/?id=194d315da86af504559a8a21026360097575bd55 for example. Ralf