I'm trying to use bus_dmamem_alloc. The function man says:

     * Allocate a piece of memory that can be efficiently mapped into
     * bus device space based on the constraints listed in the dma tag.
     * A dmamap to for use with dmamap_load is also allocated.

so I'm running:

err =
bus_dmamem_alloc(ring->dma_tag, &ring->buf,

but after calling bus_dmamem_allloc the dma_map variable is still NULL. is
this OK?

Thx, Yony
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