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coreboot-kgpe-d16/Documentation/mainboard/lenovo/t440p.md
Chris Morgan 5e5e789f9b nb/intel/haswell/peg: Add PEG driver stub 
This is a port of https://review.coreboot.org/c/coreboot/+/22337 to the
Haswell northbridge.  This code is necessary to support the dGPU of the
t440p. Code was cut and pasted from Sandy Bridge with vendor IDs updated
to the correct Haswell values.  Tested on t440p with dGPU on Ubuntu
18.04.4 with 5.3.0-28 kernel. Without patches dmesg reports Nouveau is
unable to read the VBIOS of the dGPU as it has an invalid checksum (I
checked that the ROM in CBFS is correct). With this patch DRM works
correctly with both the Nouveau driver and the Nvidia proprietary
driver. Windows 10 1909 also tested but generates bluescreen once GPU
driver is loaded.

Change-Id: Ie5f089fb6fd774e6c61f4f9281e2945bd44edf27
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38743
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
2020-03-06 07:54:26 +00:00

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Lenovo ThinkPad T440p

This page describes how to run coreboot on Lenovo ThinkPad T440p.

Required proprietary blobs

Please see mrc.bin.

Flashing instructions

T440p has two flash chips, an 8MB W25Q64FV and a 4MB W25Q32FV. To flash coreboot, you just need to remove the big door according to the T440 Hardware Maintenance Manual and flash the 4MB chip.

T440p flash chip

To access the 8MB chip, you need to remove the base cover.

T440p 8MB flash chip

The flash layout of the OEM firmware is as follows:

00000000:00000fff fd
00001000:00002fff gbe
00003000:004fffff me
00500000:00bfffff bios

After flashing coreboot, you may need to re-plug the AC adapter to make the laptop able to power on.

Known Issues

  • No audio output when using a headphone
  • The touchpad is misconfigured, the 3 keys on top are all identified as left button
  • Cannot get the mainboard serial number from the mainboard: the OEM UEFI firmware gets the serial number from an "emulated EEPROM" via I/O port 0x1630/0x1634, but it's still unknown how to make it work
  • The dGPU does not currently work in Windows.

Working

  • boot Arch Linux with Linux 4.19.77 from SeaBIOS payload
  • integrated graphics init with libgfxinit
  • EHCI debug: the port is the non-charging USB2 port on the right
  • video output: internal (eDP), miniDP, dock DP, dock HDMI
  • ACPI support
  • keyboard and trackpoint
  • SATA
  • M.2 SATA SSD
  • USB
  • Ethernet
  • WLAN
  • WWAN
  • bluetooth
  • virtualization: VT-x and VT-d
  • dock
  • CMOS options: wlan, trackpoint, fn_ctrl_swap
  • internal flashing when IFD is unlocked
  • using me_cleaner
  • dGPU (must be enabled in CMOS options)