continuing the chat,
for displaying "Hello world" on serial

#define CLKIN_DEV PNP_DEV(0x2e, IT8718F_GPIO)

void mainboard_romstage_entry(unsigned long bist)
{
        ite_conf_clkin(CLKIN_DEV, ITE_UART_CLK_PREDIVIDE_24);

        ite_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);

....
How can I write "Hello world !" ? and where ?

Could it be :

        ite_conf_clkin(CLKIN_DEV, ITE_UART_CLK_PREDIVIDE_24);

        ite_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);

        printk(" HELLO WORLD ! FROM COREBOOT...");
......
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