I have a T410, which is basically a larger x201 with optimus. While the gerrit T410 patches are still ongoing and not presently working properly, the x201 builds do work pretty well.
I did my best to replicate your efforts for nehalem and the x201 as a result, and while things do boot the dgpu isn't listed in lspci. I'm not the greatest with this sort of thing, but would it be possible for you to consider adding support, either for the x201, or the work in progress T410 patchset?
Also as another note, the T410 includes 3 separate option roms for the nvidia card, all with the same pciid, and so trial and error may be what I need to get it working - not sure yet.
https://review.coreboot.org/c/coreboot/+/11791/10
Thanks!
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