Pavlushka has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/38864 )
Change subject: superio/nuvoton/nct5539d: Update documentation and remove DSDT ......................................................................
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Patch Set 2: Code-Review+2
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Tested, didn't go well, the system halts earlier than before. A bit lazy to create a full report but it's on the way (in few hours may be).
Looks like your devicetree is broken, as there are tons of "BUG: Check your devicetree!" There's documentation how to use the SIO SSDT gen: https://doc.coreboot.org/superio/common/ssdt.html
added ssdt option to the devicetree.cb and tested, https://drive.google.com/open?id=1eyPO_tEzJdNJ_pfDYLmsZ0R-1gJVPuNg
I see no "BUG", so it works fine?
To the point of "found /dev/ttyS0".