I'm trying to build coreboot for T440p and still can't boot. I have tried the official repo's latest master branch, it can't boot. The power button led is on, keyboard led on for a second and then off, fan is on, but the screen is not. I don't have a debug device. Ordered a FT232H but it's on the way. I don't know what's the problem. So I looked around trying to find a working one. I also tried the official repo's 4.11_branch, it's the same problem.

I also tried different configs use LIBGFXINIT or use VGAROM, and Tianocore or Seabios payload. Still the same problem. The most recent config is:

The sha1sum of the blobs I obtained are:

$ sha1sum mrc.bin

d18de1e3d52c0815b82ea406ca07897c56c65696 mrc.bin

$ sha1sum pci8086,0416.rom (obtained through linux kernel)

4074e1fa2f788f91d3612b6fe861c9c3faf5560a pci8086,0416.rom

I also tried archfan's repo for T440p but still can't build. It has some issues with submodules https://github.com/archfan/coreboot/issues/12

I flashed back backuped original bios, and it can boot. I assume it's still a software issue with my coreboot build. How to get a working snapshot of coreboot, submodules, and seabios/tianocore at the time when the T440p can work?