[L] Change in coreboot[main]: mb/dell: Add Latitude E6430 (Ivy Bridge)

[Nicholas Chin (Code Review)]

Attention is currently required from: Martin L Roth, Nicholas Chin, Paul Menzel.

Hello Martin L Roth, Paul Menzel, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/77444?usp=email

to look at the new patch set (#13).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: mb/dell: Add Latitude E6430 (Ivy Bridge)
......................................................................

mb/dell: Add Latitude E6430 (Ivy Bridge)

Mainboard is QAL80/LA-7781P (UMA). The version with an Nvidia dGPU was
not tested. This is based on the autoport output with some manual fixes.
The VBT was obtained using `intelvbttool --inlegacy --outvbt data.vbt`
while running version A24 (latest version) of the vendor firmware.

The flash is 8MiB + 4MiB, and can be easily accessed by removing the
keyboard. It can also be internally flashed by sending a command to the
EC, which causes the EC to pull the FDO pin low and the firmware to skip
setting up any chipset based write protections [1]. The EC is the SMSC
MEC5055, which seems to be compatible with the existing MEC5035 code.

Working:
- Libgfxinit
- USB EHCI debug (left side usb port is HCD index 2, middle port on the
  right side is HCD index 1) with the CH347
- Keyboard
- Touchpad/trackpoint
- ExpressCard (tested with USB 3.0 card)
- Audio
- Ethernet
- SD card reader
- mPCIe WiFi
- SeaBIOS 1.16.3
- edk2 (MrChromebox's fork, uefipayload_202309)
- Internal flashing using dell-flash-unlock

Not working:
- S3 suspend: Possibly EC related, DRAM power is getting cut when
  entering S3
- Physical wireless switch: this triggers an SMI handler in the vendor
  firmware which sends commands to the EC to enable/disable wireless
  devices, and has not been reimplemented
- Battery reporting: needs ACPI code for the EC
- Brightness hotkeys: probably EC related
- The system reports that the power button was pressed and shuts down
  when the CPU hits around 86 degrees Celsius, before the CPU can
  thermal throttle. Likely EC and possibly PECI related.
- Integrated keyboard with upstream GRUB 2.12 payload: Upstream GRUB
  initializes the 8042 PS/2 controller in a way that is incompatible
  with how the EC firmware emulates it. GRUB tries to initialize the
  controller with scan code set 2 without translation, but the EC only
  ever returns set 1 scan codes to the system and thus is only works as
  an untranslated set 1 keyboard or a translated set 2 keyboard,
  regardless of commands to set the scan code. A USB keyboard works
  fine.

Unknown/untested:
- Dock
- eSATA
- TPM
- dGPU on non-UMA model
- Bluetooth module (not included on my system)

[1] https://gitlab.com/nic3-14159/dell-flash-unlock

Change-Id: I93c6622fc5da1d0d61a5b2c197ac7227d9525908
Signed-off-by: Nicholas Chin 
---
A src/mainboard/dell/snb_ivb_latitude/Kconfig
A src/mainboard/dell/snb_ivb_latitude/Kconfig.name
A src/mainboard/dell/snb_ivb_latitude/Makefile.mk
A src/mainboard/dell/snb_ivb_latitude/acpi/ec.asl
A src/mainboard/dell/snb_ivb_latitude/acpi/platform.asl
A src/mainboard/dell/snb_ivb_latitude/acpi/superio.asl
A src/mainboard/dell/snb_ivb_latitude/board_info.txt
A src/mainboard/dell/snb_ivb_latitude/cmos.default
A src/mainboard/dell/snb_ivb_latitude/cmos.layout
A src/mainboard/dell/snb_ivb_latitude/devicetree.cb
A src/mainboard/dell/snb_ivb_latitude/dsdt.asl
A src/mainboard/dell/snb_ivb_latitude/gma-mainboard.ads
A src/mainboard/dell/snb_ivb_latitude/mainboard.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/data.vbt
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/early_init.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/gpio.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/hda_verb.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/overridetree.cb
18 files changed, 585 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/77444/13