there is no "proper" way because there is no mrc.bin for the t440p. mrc.bin is the ram init blob used in pre-FSP Chromebooks. The t440p has to leverage this, because there is no native raminit option for the Haswell platform, unlike the older Sandy/Ivybridge platform. So mrc.bin must be extracted from a firmware image for a Haswell Chromebook -- it doesn't matter which one. It should be 190.2kb. Use coreboot master and don't screw with any config variables you don't understand, and you should be fine :)
good luck! On Thu, Aug 20, 2020 at 7:13 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? > _______________________________________________ > coreboot mailing list -- coreboot@coreboot.org > To unsubscribe send an email to coreboot-le...@coreboot.org _______________________________________________ coreboot mailing list -- coreboot@coreboot.org To unsubscribe send an email to coreboot-le...@coreboot.org
