TODO revision 1.1 
1Some things that need to be done in no particular order:
2
3Implement request timeout and abort in ohci.c.
4
5Implement request abort in uhci.c.
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7Use the new device attach/detach framework for USB.
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9Implement isochronous transfer mode.
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11Implement audio driver.
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13Implement a modem driver for the Abstract Control Model.
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