[coreboot-gerrit] Change in ...coreboot[master]: mainboard/lenovo/t430s: Add ThinkPad T431s as a variant

[Bill XIE (Code Review)]

Hello Alexander Couzens, Patrick Rudolph, build bot (Jenkins), Patrick Georgi, Martin Roth,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/30021

to look at the new patch set (#7).

Change subject: mainboard/lenovo/t430s: Add ThinkPad T431s as a variant
......................................................................

mainboard/lenovo/t430s: Add ThinkPad T431s as a variant

The code is based on autoport and that for T430s

Tested:
- CPU i5-3337U
- Slotted DIMM 2GiB
- Soldered RAM 4GiB from samsung (There may be more models here)
- Camera
- pci-e and usb2 on M.2 slot with A key for wlan
- sata and usb2  (no superspeed components) on M.2 slot with B key for wwan
- On board SDHCI connected to pci-e
- USB3 ports
- libgfxinit-based graphic init
- NVRAM options for North and South bridges
- Sound
- Thinkpad EC
- S3
- TPM1 on LPC
- EHCI debug on SSP2 (USB3 port on the left)
- Linux 4.9.110-3 within Debian GNU/Linux stable, loaded from
  Linux payload (Heads), Seabios may also work.

Not tested:
- Fingerprint reader on USB2 (not present on mine)
- Keyboard backlight (not present on mine)
- "sticky_fn" flag in nvram

Not implemented yet:
- Fn locking in nvram (may not be identical to "sticky_fn")
- C-based native graphic init (since T431s has eDP instead of LVDS)
- Detecting the model of Soldered RAM at runtime, and loading the
  corresponding SPD datum (3 observed) from CBFS (the mechanism may be
  similar to that on x1_carbon_gen1 and s230u, but I do not know how
  to find gpio ports for that, and SPD data stored in vendor firmware.)

Change-Id: Ic8062cacf5e8232405bb5757e1b1d063541f354a
Signed-off-by: Bill XIE 
---
M Documentation/mainboard/index.md
A Documentation/mainboard/lenovo/t431s.md
A Documentation/mainboard/lenovo/t431s_bc_removed.jpg
A Documentation/mainboard/lenovo/t431s_flash_chip.jpg
A Documentation/mainboard/lenovo/t431s_programming.jpg
M src/mainboard/lenovo/t430s/Kconfig
M src/mainboard/lenovo/t430s/Kconfig.name
M src/mainboard/lenovo/t430s/Makefile.inc
M src/mainboard/lenovo/t430s/board_info.txt
M src/mainboard/lenovo/t430s/devicetree.cb
M src/mainboard/lenovo/t430s/hda_verb.c
M src/mainboard/lenovo/t430s/romstage.c
M src/mainboard/lenovo/t430s/smihandler.c
A src/mainboard/lenovo/t430s/variants/t430s/board_info.txt
R src/mainboard/lenovo/t430s/variants/t430s/gpio.c
A src/mainboard/lenovo/t430s/variants/t430s/hda_verb.c
A src/mainboard/lenovo/t430s/variants/t430s/overridetree.cb
A src/mainboard/lenovo/t430s/variants/t430s/romstage.c
A src/mainboard/lenovo/t430s/variants/t430s/smihandler.c
A src/mainboard/lenovo/t430s/variants/t431s/board_info.txt
A src/mainboard/lenovo/t430s/variants/t431s/gpio.c
A src/mainboard/lenovo/t430s/variants/t431s/hda_verb.c
A src/mainboard/lenovo/t430s/variants/t431s/overridetree.cb
A src/mainboard/lenovo/t430s/variants/t431s/romstage.c
A src/mainboard/lenovo/t430s/variants/t431s/smihandler.c
A src/mainboard/lenovo/t430s/variants/t431s/spd/Makefile.inc
A src/mainboard/lenovo/t430s/variants/t431s/spd/samsung_4gb.spd.hex
27 files changed, 865 insertions(+), 219 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/21/30021/7