On Fri, May 17, 2019 at 6:02 PM email@example.com wrote:
There is a Lanner FW-7573 platform based on the Intel Rangeley Atom C2000 series processor. To work with the Serial port in this platform, the NUVOTON NCT6776F chip is connected via the LPC bus to the processor. I just can’t get Serial port working for debuging. I take as a basis intel littleplains board. I tried to add NCT6776F support following the example of other boards - without success. There is no output to the console, and in Linux, the superiotool program does not see the NCT6776F.
Check the datasheets for PCI 0:1f.0 register LPC_EN (or search for 0x4e). Might be register 0x82 but I don't know for sure for Rangeley. I did not notice any code that would enable routing 4e/4f to LPC bus under southbridge/fsp_rangely or mainboard/littleplains.
On the official version of the BIOS I loaded linux OS and took a dump. (superiotool r => Found Nuvoton NCT6776F/D (C) (id=0xc333) at 0x4e) )
You can also compare the register banks of PCI 0:1f.0.