coreboot

There are rumors, that 16GB modules may be supported with NRI, even though the original BIOS nor the MRC blob support them in a T440p. I really wanted to test this myself, but unfortunately with limited success...

I have tested two different RAM modules over the last two months:

• ZimaBlade - 16GB PC3L-10600S (returned to seller)
• Micron MT16KTF2G64HZ-1G6A1 - 16GB PC3L-12800S

Both showed identical errors:

• The graphics output (via VGA) is mangled and unusable. Only a small "condensed" area is visible.
• EDK2 and memtest86+ start successfully (with the mentioned graphics issue), but memtest86+ crashes after a few seconds and causes a reset/reboot.
• GRUB2 loads successfully, but Debian (12/13) hangs at some point. Probably during kernel initialization.

The 16GB module from Micron starts up in other devices (Igel M340C + Lenovo T450s) without any problems and survives a memtest86+ over several hours. So it doesn't appear to be defective.

I then added various other 2/4/8 GB modules in addition to the 16GB module. Funnily enough, this changes the graphics output! Now every second line (each consisting of a few pixels in height) is displayed correctly. Unfortunately, this does not change the fact, that memtets86+ crashes and Debian can't boot.

I purchased a USB dongle (with a FT232H chip) specifically to read all Coreboot debug logs and have attached these along with my build configuration for v25.12!

I would like to know whether 16GB modules are really not supported in a T440p with NRI, or whether this could be a bug? I am happy to execute further tests or flash specific commits.