Date: Sun, 9 Apr 2006 22:47:53 -0400 From: Mike Meyer <mwm-keyword-freebsdhackers.102a7e@mired.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: hackers@freebsd.org, babkin@users.sourceforge.net, ceri@submonkey.net, scottl@samsco.org Subject: Re: What's in a (device) name? Message-ID: <17465.51033.78362.699332@bhuda.mired.org> In-Reply-To: <20060409.185335.105395062.imp@bsdimp.com> References: <9399827.1657341144611794358.JavaMail.root@vms070.mailsrvcs.net> <17465.32905.727289.260996@bhuda.mired.org> <20060409.185335.105395062.imp@bsdimp.com>
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In <20060409.185335.105395062.imp@bsdimp.com>, M. Warner Losh <imp@bsdimp.com> typed: > In message: <17465.32905.727289.260996@bhuda.mired.org> > Mike Meyer <mwm-keyword-freebsdhackers.102a7e@mired.org> writes: > : The major problem with it is that todays bus architectures don't have > : stable device addresses. Instead of devices having a fixed address on > : the bus that the user sets, the addresses are assigned as the devices > : are discovered. This is pretty much a requirement if you want to sell > : hardware to 12:00 flashers. While that's not the market that FreeBSD > : deals with, it is the hardware that FreeBSD runs on. > usb assigns addresses dynamically. Everyone else does it basically > statically. PCI slot/device numbers are static, but extreme > configurations can change the bus number. USB is popular enough and PCI changes enough that we have to be able to deal with them. Firewire would seem to be a lot like USB - hot pluggable and chainable, though I'm not sure if something like a firewire hub. What does it to do wire down device addresses? Thanks, <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information.
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