How do I allocate DMA-able memory? Or is all memory DMA-able? Like so:
#include <machine/pmap.h>
dma_addr = vtophys(addr);
The UHCI (and OHCI) USB controllers use DMA to access the queues with
the TransferDescriptors and QueueHeads. This is going to be loads of
small (4 to 32 byte) memory blocks.
Nick
--
e-Mail: hi...@skylink.it
To Unsubscribe: send mail to majord...@freebsd.org
with "unsubscribe freebsd-hackers" in the body of the message
