The Linux Kernel: Configuring the Kernel Part 4
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Here, we are asked about “IBM Calgary IOMMU support (CALGARY_IOMMU)”. This option will enable support for IOMMUs that belong to the xSeries x366 and x460 by IBM. This will also allow 32-bit PCI that do not support DAC (Double Address Cycle) devices of such systems to run properly because this system setup will have issues accessing more than 3GB of RAM. If needed, these IOMMU devices can be turned off at boot time using the “iommu=off” parameter.
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