> Just to clarify, the patch that you had us try was not intended as an actual > fix, correct? It was only for diagnostic purposes, i.e. to see if there is > some kind of cache coherence issue, which seems to be the case? So perhaps > the only fix needed is to add dma-coherent to our device tree? That sounds quite error prone. How many other DT blobs are missing the property? If the memory should be coherent, i would expect the driver to allocate coherent memory. Or the driver needs to handle non-coherent memory and add the necessary flush/invalidates etc. Andrew
