Bill XIE has posted comments on this change. ( https://review.coreboot.org/29434 )
Change subject: mb/lenovo/x220: Add x1 as a variant ......................................................................
Patch Set 8:
(1 comment)
https://review.coreboot.org/#/c/29434/8/src/mainboard/lenovo/x220/variants/x... File src/mainboard/lenovo/x220/variants/x1/overridetree.cb:
https://review.coreboot.org/#/c/29434/8/src/mainboard/lenovo/x220/variants/x... PS8, Line 1: chip northbridge/intel/sandybridge
looks like this a normal devicetree, not an overridetree
There just are a lot of parameters needing to be override. You can compare this with the base tree src/mainboard/lenovo/x220/devicetree.cb, and you can see a lot of values are absent here.