Change in ...coreboot[master]: mainboard/lenovo: Add ThinkPad T431s

[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 (#4).

Change subject: mainboard/lenovo: Add ThinkPad T431s
......................................................................

mainboard/lenovo: Add ThinkPad T431s

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
- 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")
- 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
A src/mainboard/lenovo/t431s/Kconfig
A src/mainboard/lenovo/t431s/Kconfig.name
A src/mainboard/lenovo/t431s/Makefile.inc
A src/mainboard/lenovo/t431s/acpi/ec.asl
A src/mainboard/lenovo/t431s/acpi/platform.asl
A src/mainboard/lenovo/t431s/acpi/superio.asl
A src/mainboard/lenovo/t431s/acpi_tables.c
A src/mainboard/lenovo/t431s/board_info.txt
A src/mainboard/lenovo/t431s/cmos.default
A src/mainboard/lenovo/t431s/cmos.layout
A src/mainboard/lenovo/t431s/data.vbt
A src/mainboard/lenovo/t431s/devicetree.cb
A src/mainboard/lenovo/t431s/dsdt.asl
A src/mainboard/lenovo/t431s/gma-mainboard.ads
A src/mainboard/lenovo/t431s/gpio.c
A src/mainboard/lenovo/t431s/hda_verb.c
A src/mainboard/lenovo/t431s/mainboard.c
A src/mainboard/lenovo/t431s/romstage.c
A src/mainboard/lenovo/t431s/smihandler.c
A src/mainboard/lenovo/t431s/spd/Makefile.inc
A src/mainboard/lenovo/t431s/spd/samsung_4gb.spd.hex
A src/mainboard/lenovo/t431s/thermal.h
27 files changed, 1,268 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/21/30021/4