[coreboot] Problem with W83627DHG in Baytrail I (Possible IRQ conflict or overlapped SOC legacy COM1)

[Rudolf Marek]

Hi,

In general I would check ELCR (I/O port register 0x4d0) to check if it is correctly programmed to EDGE/LEVEL (it should be edge)

Also, how the Linux is supposed to detect the I/O port irq? I think you need some PNP device in ACPI to let linux infer the IRQ.

I would also try to disable the IRQ from SoC, you just need to check how they are enabled (sorry not an expert here)
and also I would use the legacy 0x3f8 instead.

Thanks
Rudolf