Hi yk,

As Matt said It is not just meant for chromebooks but haswell in general. Just follow the instructions given on the coreboot page to obtain mrc.bin and place it in the root coreboot directory as it says.

That tutorial seems fishy to me as well. I'd suggest just run 'make menuconfig' and select t440p from mainboard menu. You don't need to change any values. The default values should work.

Finally, build the coreboot image, split into 8MB + 4MB chunks and just flash the 4MB chip.

Best,

Harshit

On Thu, Aug 20, 2020, 5:13 PM yk via coreboot <coreboot@coreboot.org> wrote:

To anyone who has corebooted a t440p:

I followed the instructions here
https://doc.coreboot.org/northbridge/intel/haswell/mrc.bin.html to
obtain an mrc.bin for the t440p, but it seems like these instructions
are generalized and are meant for chromebooks, and not thinkpads. I
gave it a try anyways and my t440p beeps and flashes LED's (as
configured in .config, to do so on fatal error). Months of searching,
and I can't find any documentation or archived emails from this
mailing list for obtaining an mrc.bin specifically for the t440p.

There exists this tutorial https://0xcb.dev/lenovo-t440p-coreboot/ but
it tells me to use a forked version of coreboot which seems really
fishy. I browsed the commits from that fork and I couldn't find anything
that "automates obtaining mrc.bin" as it promises.

What is the proper way to obtain the mrc.bin and configure for t440p?

CONFIG_DCACHE_RAM_MRC_VAR_SIZE=0x30000 <-- also what should this value
be if the mrc.bin is 186K?
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