[coreboot] Coreboot console_init() doesn't work on Rangeley board?

[Qinqxin Wei]

Hi,

I am managing to replace BIOS with coreboot on a Rangeley evaluation board, but the serial console cannot display message after coreboot calls console_init() in src/southbridge/intel/fsp_rangeley/romstage.c.

The console is connected to UART0 (0x3f8), which has been verified by BIOS.

My configuration of coreboot includes:
Mainboard: Intel->Mohon Peak CRB, which is the only choice for Rangeley
FSP and microcode: downloaded from Intel FSP (https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=23676).
Payload: U-boot-x86 (should be irrelevant to payload, since coreboot just enters romstage)

I have checked that the UART0 registers should have been initialized.
The TX FIFO should also work: after out something to 0x3f8, LSR will change.
I have also checked some other registers might related to UART.
The UART_CONT (0:1f.0-0x80) is in the default state (0x00000003).
The GPIO Use Select is also in default state: GPIOS_13 is 0.

Is there any other register can block the UART output?

Besides, actually the coreboot finally run deeply.
The post code changes from 47->66->67->69->...>72->73->77... and finally stop at 0xE2.
But there's no console display so I cannot know where it stops.

Regards,
Qingxin