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Setting up my MTRR correctly

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  • #16
    root=UUID=71c43e66-6b6d-4fb1-8b23-918433c9ebec ro quiet splash

    but why ro?

    enable_mtrr_cleanup mtrr_spare_reg_nr=0 pci=usr_crs

    shorten that to:
    enable_mtrr_cleanup mtrr_spare_reg_nr=1

    video=vga=792

    and scrap the rest and see what happens

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    • #17
      Originally posted by energyman View Post
      root=UUID=71c43e66-6b6d-4fb1-8b23-918433c9ebec ro quiet splash

      but why ro?
      No idea, it was there to start with.

      enable_mtrr_cleanup mtrr_spare_reg_nr=0 pci=usr_crs

      shorten that to:
      enable_mtrr_cleanup mtrr_spare_reg_nr=1

      video=vga=792

      and scrap the rest and see what happens
      Trying now.
      No change to it working, but cat /proc/mtrr now gives
      Code:
      reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
      reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
      reg02: base=0x0bfe00000 ( 3070MB), size=    2MB, count=1: uncachable
      reg03: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
      reg04: base=0x0c0000000 ( 3072MB), size=  512MB, count=1: write-combining
      dmesg pastebin with changed settings

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      • #18
        I am too lazy to check the memory ranges, but I am pretty sure that from 3584 to 4096 lies your video memory and the 2mb uncachable are pci space.

        Which is normal for a board with a bios that can not remap pci space or has an intel chipset.

        So.. it doesn't look bad at all from a first glance.

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