Thank you Rudolf for your advise, I checked the interrupts in Linux and showed me that the interrupts were already in EDGE mode but anyway I changed the interrupt mode in southcluster.c from quiet to edge.
The default PNP configuration for the Winbond SIO was crashing Windows 7 and 10 and then I created a very simple PNP configuration and now both Windows OS boots fine and recognized the UART ports correctly but only COM2 with IRQ3 works correctly. Tomorrow I will keep testing to try to determine the reason but if any of you have any idea how to test or fix I will be glad to hear. I wish all of you to have a nice day. ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On June 6, 2018 11:46 PM, Rudolf Marek <[email protected]> wrote: > 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 -- coreboot mailing list: [email protected] https://mail.coreboot.org/mailman/listinfo/coreboot
