Hi, thank you both for the answers. I have studied libpci from libpayload and removed that device list generation with mallocs. Done a bunch of trial-error cleanup and now chipset enable and probing for flash works in ramstage's top of hardwaremain function with this line included: x86_setup_mtrrs(36); //from cpu init routine see attached log: ramstage_with_mtrr.txt. Also attaching nonworking logs in romstage and ramstage.
Now the question is how these mtrrs should be set in cache_as_ram.inc or maybe I'm totally wrong? :)
Thanks, Tadas