d2b3961fdc
Fix a common mistake of using KB/MB where KiB/MiB is what actually is meant. 1 MB = (10^3)^2 = 1000000 1 MiB = (2^10)^2 = 1048576 Change-Id: I78327652b6c6526318071a9d4bafd7ec279ea614 Signed-off-by: Evgeny Zinoviev <me@ch1p.io> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39685 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
61 lines
1.8 KiB
Markdown
61 lines
1.8 KiB
Markdown
# Lenovo ThinkPad T440p
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This page describes how to run coreboot on [Lenovo ThinkPad T440p].
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## Required proprietary blobs
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Please see [mrc.bin](../../northbridge/intel/haswell/mrc.bin).
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## Flashing instructions
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T440p has two flash chips, an 8 MiB W25Q64FV and a 4 MiB W25Q32FV. To flash
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coreboot, you just need to remove the big door according to the T440
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[Hardware Maintenance Manual] and flash the 4 MiB chip.
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To access the 8 MiB chip, you need to remove the base cover.
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The flash layout of the OEM firmware is as follows:
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00000000:00000fff fd
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00001000:00002fff gbe
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00003000:004fffff me
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00500000:00bfffff bios
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After flashing coreboot, you may need to re-plug the AC adapter to make
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the laptop able to power on.
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## Known Issues
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- Cannot get the mainboard serial number from the mainboard: the OEM
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UEFI firmware gets the serial number from an "emulated EEPROM" via
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I/O port 0x1630/0x1634, but it's still unknown how to make it work
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- The dGPU does not currently work in Windows.
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## Working
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- boot Arch Linux with Linux 4.19.77 from SeaBIOS payload
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- integrated graphics init with libgfxinit
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- EHCI debug: the port is the non-charging USB2 port on the right
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- video output: internal (eDP), miniDP, dock DP, dock HDMI
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- ACPI support
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- keyboard and trackpoint
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- SATA
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- M.2 SATA SSD
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- USB
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- Ethernet
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- WLAN
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- WWAN
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- bluetooth
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- virtualization: VT-x and VT-d
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- dock
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- CMOS options: wlan, trackpoint, fn_ctrl_swap
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- internal flashing when IFD is unlocked
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- using `me_cleaner`
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- dGPU (must be enabled in CMOS options)
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[Lenovo ThinkPad T440p]: https://pcsupport.lenovo.com/us/zh/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t440p
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[Hardware Maintenance Manual]: https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t440p_hmm_en_sp40a25467_04.pdf
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