On Wed, Jan 30, 2008 at 01:14:03AM +1100, Michael Ellerman wrote: > For example a machine with 4GB of memory would end up with the normal > IOMMU window from 0-2GB and the fixed mapping window from 2GB to 6GB. In > this case a 64-bit device wishing to DMA to 1GB would be told to DMA to > 3GB, plus any offset required by firmware. The firmware offset is encoded > in the "dma-ranges" property.
Shouldn't the fixed mapping be between 4G and 8G (and the offset for 1G is at 5G), to account for the MMIO range at 2-4G? -Olof _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
