If CONFIG_SPL_SERIAL_SUPPORT is not set, then the build will fail: board/ti/am335x/built-in.o: In function `spl_start_uboot': board/ti/am335x/board.c:247: undefined reference to `serial_tstc' board/ti/am335x/board.c:247: undefined reference to `serial_getc' Avoid the calls to the serial functions in that case. Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>lime2-spi
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