TODO revision 1.11 
1Some things that need to be done in no particular order:
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3
4Add lots of bus_dmamap_sync().
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6Implement isochronous transfer mode.
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8Implement audio driver.
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10Do bandwidth accounting.
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12Use lock manager locks.
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14Use the pool allocator for TDs et al.
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16Throw out more USBDI gunk.
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18Port FreeBSD umass driver.
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20Make hub driver note transition between self and bus powered state.
21Handle overcurrent conditions.
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23Make it possible to preallocate DMA buffers to avoid calling the
24memory allocator from an interrupt context.
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26Move memory allocation and copying to HC independent code.
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28Use a TD chain in ohci.c to allow transfers > 8K.
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30Document device driver API.
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32Document HC driver API.
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