Date: Tue, 27 Aug 2002 16:37:15 +0200 (CEST) From: Soeren Schmidt <sos@freebsd.dk> To: Bruce M Simpson <bms@spc.org> Cc: Ian Dowse <iedowse@maths.tcd.ie>, n_hibma@FreeBSD.ORG, joe@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: USB->ATA devices Message-ID: <200208271437.g7REbFUl091711@freebsd.dk> In-Reply-To: <20020827135110.GB24795@spc.org>
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It seems Bruce M Simpson wrote: > > If you're interested, I wrote a functional but incomplete driver > > for a similar device, the Prolific Technology PL2307 bridge. I just > > This is good stuff. > > The Onspec expects a command packet containing the ATA register contents > in the order they appear in i/o space. Plus an additional byte whose > meaning I have yet to decipher. > > > implemented the conversion for a minimal set of ATA commands in the > > driver itself; it would obviously be better to have the ATA layer > > in a separate driver though. The code for that driver is at: > > How about doing ata(4) over usb? > > Support was added for PCMCIA to ata in the form of ata-card.c. This > required macro-izing the bus_space_write*() calls amongst other things. Ahem, all the bus_* stuff was done to support other platforms (alpha/sparc) not for the PCMCIA stuff which is very much straight forward... > Normally this takes place over an underlying isa/pci bus abstraction, > maybe we could re-use this abstraction in ata-usb.c to avoid changing > anything here? That way we avoid duplicating the ATA bit-banging code. It should be possible to hide the USB stuff under the ATA_* macroes or even just under bus_space_*. I need a bit more concrete details on how to call into the USB code, then it should be pretty easy to add... > <URL: http://www.cuivre.fr.eu.org/~thomas/atapicam/>; > > Remember atapicam? I like the fact that it allows one to run cdrecord > with an ATAPI CDRW drive; perhaps it could be re-used and extended to > allow CAM to be used to interact with these pure ATA devices? Of course > in this case, if we make the devices on the USB->ATA bridge look like > ata-disk devices and what have you, who needs CAM? atapicam only does ATAPI, not ATA... -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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