The best driver to use to see the bus_dma differences between NetBSD
and FreeBSD is perhaps the bge driver. I ported this about a year ago
from FreeBSD to NetBSD, it hasn't diverted that much. And it's a network
driver.

- Frank

-- 
Frank van der Linden                                            fvdl@netbsd.org
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NetBSD. Free, Unix-like OS. > 45 different platforms.    http://www.netbsd.org/