* Obtain the physical addresses of the RX and TX
* rings which we'll need later in the init routine.
More formally, it's not a 'physical address'- it's a "Bus Address", or
"Address appropriate for a device on this bus to use to access the
memory so mapped". Under sparc64, for example, it would be an iommu
2. All callback functions for dma- you should be checking error.
3. You might want to recycle rather than create/destroy mbuf tags.
You should note that FreeBSD's bus_dma is hardly as strict or as formal as
NetBSD's, so there's room for a lot of slop here. The key thing to test it on
is an alpha that has both direct-mapped and sgmap hardware to see that it
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