Date: Sun, 21 Sep 2003 17:02:53 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: freebsd-mobile@freebsd.org, pir@pir.net Subject: Re: 4.x or 5.x for newbie install on laptop? Message-ID: <20030921.170253.126764973.imp@bsdimp.com> In-Reply-To: <20030921192420.GD4779@pir.net> References: <20030921163414.GA3922@pir.net> <oprvu5wdijnva4ua@smtpx.operamail.com> <20030921192420.GD4779@pir.net>
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In message: <20030921192420.GD4779@pir.net>
Peter Radcliffe <pir@pir.net> writes:
: The cutouts/keys on the end of the card are different, to make sure
: that you don't manage to put 32bit cards into 16bit only slots (16bit
: only comtrollers/slots are quite hard to find these days in my
: experience, just very old laptops).
:
: The 16 bit cards have this shape on the sides of the connector;
:
: | o o o o...o o o o |
: | ... |
: | o o o o...o o o o |
:
: Whereas the 32 bit cards have this shape;
:
: | o o o o...o o o o |
: | |
: | o o o o...o o o o |
:
: So 16bit cards will go into 32bit controllers but 32bit cards will not
: go into 16bit controllers.
Actually, that's not why they are different. The 32-bit ones are "low
voltage" cards and operate at 3.3V only. The typical 16-bit card
operates at 5.0V and is a high voltage card. There are a number of
"Low voltage" 16-bit cards that operate only at 3.3V and they are
keyed like you drew the 32-bit card.
A better distinction is to look for the ground plane on 32-bit cards.
it is copper and has a number of bumps on it. That's universally the
distinction (although I've seen one or two 16-bit cdrom controllers
that have the cardbus stripe on them that were rumored to be 32-bit
on external power, but I've never been able to confirm that).
: Then it won't work with 4.x. I don't know if there is support for
: firewire (in particular) cardbus cards in 5.x.
There is for the fwohci chips. There's none for Sony's earlier,
proprietary firewire controller.
Warner
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