On Mon, Dec 16, 2002 at 01:12:33PM +0100, Harti Brandt wrote the words in effect of: > > Hi all, > > is there any documentation on the FreeBSD-busdma stuff? FreeBSD seems > differ substantially from NetBSD in this regard. As far as I understand > FreeBSD uses an older version.
Hello Harti, I recentley started writing a bus_dma manual page, and also adding bits from the NetBSD manual page. You can view a copy which gets updated about every day or two: [1] http://www.unixdaemons.com/~hiten/work/misc/bus_dma.9.txt [2] http://www.unixdaemons.com/~hiten/work/misc/bus_dma.9.patch Yes, FreeBSD does use an old version of bus_dma, but things are being ported as needed AFAIK. For example, it would be good to have the BUS_SPACE_DEBUG functionality ported to our bus_space/dma implementation -- I am working on this at the moment; and also the naming o some flags, like BUS_DMAMEM_NOSYNC, which is BUS_DMA_COHERENT on NetBSD. I was gonna compose a mail to Warner about this, but now its being asked on a list, I am letting it out. :) There is also stuff about bounce thresholds, and the nature of DMA transfers (i.e. BUS_DMA_READ/WRITE) which needs to be ported. Once step at a time, and hopefully I will have all this done. If I get enough time after this, I will be doing an article on bus_dma, but not sure yet. NOTE: The above copy is work in progress -- the man page conversion should be finished hopefully by end of this week. Cheers. -- Hiten Pandya ([EMAIL PROTECTED], [EMAIL PROTECTED]) http://www.unixdaemons.com/~hiten/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message