> Could You share a Linkit _defconfig with early serial debug enabled? > I'm decidedly missing something as, even enabling > > CONFIG_DEBUG_UART=y > CONFIG_DEBUG_UART_BASE=0x10000e00 > CONFIG_DEBUG_UART_CLOCK=20 > CONFIG_DEBUG_UART_SHIFT=2 > CONFIG_DEBUG_UART_ANNOUNCE=y > > I still have plenty of errors: > > /home/mcon/vocore/__V2__/Buildroot/recov/host/bin/mipsel-linux-ld.bfd: > arch/mips/cpu/start.o: in function `wr_done': > (.text+0x650): undefined reference to `debug_uart_init' > /home/mcon/vocore/__V2__/Buildroot/recov/host/bin/mipsel-linux-ld.bfd: > (.text+0x654): undefined reference to `debug_uart_init' > /home/mcon/vocore/__V2__/Buildroot/recov/host/bin/mipsel-linux-ld.bfd: > board/vocore/vocore2/built-in.o: in function `board_early_init_f': > (.text.board_early_init_f+0x10): undefined reference to `printhex8' > /home/mcon/vocore/__V2__/Buildroot/recov/host/bin/mipsel-linux-ld.bfd: > common/built-in.o: in function `putc': > (.text.putc+0x18): undefined reference to `printch' > /home/mcon/vocore/__V2__/Buildroot/recov/host/bin/mipsel-linux-ld.bfd: > common/built-in.o: in function `puts': > (.text.puts+0x2c): undefined reference to `printch' >
You need to pick a debug uart driver, e.g. CONFIG_DEBUG_UART_NS16550.