Date: Sat, 12 Jan 2008 16:26:53 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: ticso@cicely.de Cc: freebsd-usb@freebsd.org Subject: Re: USB Slave mode - FreeBSD emulate a CDROM device? Message-ID: <200801121626.54803.hselasky@c2i.net> In-Reply-To: <20080112115132.GI79270@cicely12.cicely.de> References: <683E901E-8564-49FF-B177-754EF48232A4@gmail.com> <20080112115132.GI79270@cicely12.cicely.de>
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On Saturday 12 January 2008, Bernd Walter wrote: > On Tue, Jan 08, 2008 at 11:26:26PM +0100, =D8ystein Andreassen wrote: > > Hello, > > > > I would like to make my FreeBSD pc a USB CD/DVD-ROM for a server. > > I have a lot of bootable ISO images and I dont like to waste time and > > CD=B4s > > on burning this images each time I need to use them (I usally damage > > or loose > > them between each time or they have been updated). So instead I would > > like > > to know if it is possible to make the FreeBSD USB stack behave as a > > USB slave > > and present an ISO image to another machine via a usb host-to-host > > cable. > > (I need to boot from the CD=B4s). > > A PC has not the required hardware to do so. > There are USB devices and USB hosts. > You can only connect a single USB host to many devices, but not two > hosts together. > There are interlink cables on the market, but those present an USB > device to both sides and are not generic to do anything else than the > profile they are build for. > > Hans Petter however did implement USB device software support to allow > FreeBSD beeing used as a device. > It at least supports the AT91RM9200 internal USB device controller, but > I don't know if it supports anything else. Hi, The current implementation of USB device support only implements CDC ethern= et.=20 Adding support for a mass storage device is not a big deal. Though you need= =20 to define an interface for how you will provide your disk or file to the=20 interface. Probably handling this from userland will solve your problem. Does your box have PCI slots? There are some PCI boards available for a che= ap=20 price that supports USB device functionality. I plan to add support for more chips during the spring, but I haven't decid= ed=20 which yet. > And I think he just did implement a CDC ethernet device and not umass, > so software needs to be written anyway. > I've CC'ed him, since he can answer about other hardware that he > possibly supports. That is correct. > > I would have liked to offer the AT91RM9200 based board we produce > ourself, but it wasn't designed for this purpose so our current board > has no device ports. > But we are planning an extended version, so this might change in the > near future. I have a KB92002B board which I bought=20 from "http://www.kwikbyte.com/KB9202.html". It is full speed USB only. > > There a USB device controllers that can be added to PCs, but most of > them are more designed for teaching purpose. > For example I'd seen PDIUSBD11 chips hooked up to printer ports, but > this chip is not being manufactured anymore and this type of interfacing > is very slow. > > The situation is much better if you use SCSI. > You can interconnect two SCSI controller together - given that the > addresses on both controller are not configured to be the same. > FreeBSD has code for emulation disk drives with target capable SCSI > controllers, which at least is supported by the ahc(4) driver. > The controller on the other box can just be of any kind. =2D-HPS
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