On Tue, Oct 26, 2010 at 7:51 PM, Mitch Bradley <[email protected]> wrote: > It's probably unnecessary on modern machines, but old PCs were fairly > restrictive about DMA addresses due to short counters. The buses on which > such restrictions applied are no longer at the root level, but they were > once there...
It's still necessary. The QE, which we ship on several of our current parts, can only DMA to/from 32-bit addresses, even on SOCs that support 36-bit addressing for everything else. -- Timur Tabi Linux kernel developer at Freescale _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
