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• File src/soc/intel/common/block/systemagent/systemagent.c:

  • Patch Set #2, Line 118: if (!get_enable_above_4GB_mmio())

    . I honestly can't envision any situation where advertising that window would cause things to misbehave unless it's an OS limitation.

    
    We can try with DGPU kind of usage where device needs higher memory and it tries to bind with memory above 4GB and eventually results into reboot issue due to "[ 2.352541] [drm] Not enough PCI address space for a large BAR." as mentioned above during my exercise with DGPU card.

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