For many embedded systems USB seems to be a good solution for data acquisition modules - as USB supports a frame rate of 1 ms which is fast enough for many feedback control applications. The problem now is that USB is currently only supported b

Intel IOMMU map throws an error if a translation entry is changed read to write. This module may not unmap and then remap the entry after fixing the permission b c this open up a small windows where hw DMA may page fault Hence, make all entries to be