ee0f53cd8c
In particular, when doing the "swap hscbs" trick, the scb must reference the correct hscb_map when it gets a new hscb, otherwise when you go to sync an hscb later, you could end up using the wrong dmamap. In order to make this work, we have to convert the shared_data stuff to use a map_node, because of the "sentinel" trick played with the initial "next_hscb". This driver now works on XScale-based platforms.