The hardware of this machine is mostly identical to the already
supported Thinkpad Tx80 machines. Minor differences are the absence of
SODIMM slots (i.e. all RAM is soldered on), two fewer eDP lane pairs,
and different PCIe lane assignment.
All the hardware configuration settings (VBT, GPIO register dumps,
hda verbs, and so on) have been obtained running the latest BIOS/EC
firmware (1.59/N20ET74W, 1.15/N20HT28W). PCIe port assignments as well
as USB, RAM SPD and GPIO assignments have been cross-checked against
publicly available schematics (Finn-1).
Basic functionality has been validated on a Thinkpad X280 part number
20KF-002QUS with 16GB onboard RAM, i7-8650U CPU. The laptop has been
tested with SeaBIOS 1.17 as a payload booting either debian 13 or
Windows 10. A cursory check of the hardware (video, wifi, audio, wired
ethernet, reboot, sleep) shows no issues. This patch also includes a
fix for the headphone jack detection that's been already validated
on the Thinkpad T480 with commit e5d10e5d23 ("mb/lenovo/t480: Fix
headphone jack").
Change-Id: Ia8e6c40b200dee240d08d79253fbbe0842882a80
Signed-off-by: Johann C. Rode <jcrode@gmx.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90254
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
0b4d41004d