Date: Sat, 17 May 2003 09:37:14 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: john@utzweb.net Cc: freebsd-mobile@freebsd.org Subject: Re: IEEE 1394 support Message-ID: <20030517.093714.94555121.imp@bsdimp.com> In-Reply-To: <15782.131.107.3.70.1053122902.squirrel@utzweb.net> References: <20030516153211.W24315@12-221-88-80.client.insightBB.com> <ba3j7d$vmt$1@main.gmane.org> <15782.131.107.3.70.1053122902.squirrel@utzweb.net>
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<john@utzweb.net> writes:
: ie, if it sez 'firewire' on it, it 'Just Works'(tm), be it cardbus,
: pcmcia, pci or isa?( dont think there are any isa firewire cards out there
: - tho if there are pcmcia cards, then i suppose it could be possible)
remove 16-bit stuff from that, and yet. There's no support for things
that aren't ohci-fw based. As far as I know, this covers most
firewire chips.
If there were ISA/PCMCIA firewire cards, then they'd be very slow
devices (100Mbps isn't possible sustained). They also wouldn't be
supported without a lot of work.
: next question is a bit hard to ask tersely, but i'll try...
: does firewire avoid the goofyness that usb, usb2.0 has where the plug is
: the same, but the chips' bus interface is apparantly not the same? ie usb
: is supported in FreeBSD and usb2 is not. is there older, slower, firewire
: things and newer, faster, firewire things and they all work? (did that
: make sense?)
USB 1 and USB 2 are mechanically and electrically compatible.
FreeBSD's support for 2.0 is weak right now, although I know that the
ehci bridges are now in the tree. I've used usb2 devices in a slower
usb1 speeds once in the past.
Warner
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