Date: Sat, 02 Oct 2004 21:44:08 -0400 From: "Ketrien I. Saihr-Kesenchedra" <ketrien@error404.nls.net> To: "M. Warner Losh" <imp@bsdimp.com>, freebsd-hackers@freebsd.org Subject: Re: Probing PCI devices not detected by BIOS Message-ID: <415F5968.5070904@error404.nls.net> In-Reply-To: <20041002.192414.94755346.imp@bsdimp.com> References: <415EC35E.6050602@jonny.eng.br> <20041002.192414.94755346.imp@bsdimp.com>
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M. Warner Losh wrote: >In message: <415EC35E.6050602@jonny.eng.br> > João Carlos Mendes Luís <jonny@jonny.eng.br> writes: >: My problem: I have an old ASUS P2B-DS motherboard based server, and want to >: use a Realtek 8169 Gigabit LAN Card with it. But the BIOS does not detect the >: LAN card, I don't know why. If I put the card in another computer, it is >: detected perfectly. Unless this is a hardware incompatibility problem, I would >: expect FreeBSD to do a better job than the old BIOS. > >Chances are good that you might have a problem. I have a few devices >that don't appear on one of my machines because the machines are too >old and not compliant with the latest PCI standards. I also have one >cardbus card that refuses to work on some machine due to, I think, bad >(no?) 3.3V power. > > There are currently three PCI standards, not including PCI-X. PCI2.1, PCI2.2, PCI2.3. (Again, not including PCI-X, this is only 32bit/33MHz.) On top of this, you have three voltage standards; PCI 5V, PCI3.3V, and PCI-Universal (3.3/5.) These are the -keying- of the slots. So I got out the PCI 2.3 specs, go to pp185. A PCI 2.3 slot is keyed at the front (towards the front of the case), as the P2B-DS is, and is 5V. A PCI 3.3V slot is keyed towards the rear (towards the I/O panel). Then there's PCI Universal; this a card-only specification, which has a double-keyed card (keyed front -and- rear) to be inserted in 3.3V or 5V slot. A universally keyed card should support either 3.3V -or- 5V normally. The Realtek 8169's I've seen are keyed universal, but is specifically a PCI 2.2 or later 3.3V card. A universal keyed PCB is apparently cheaper to make than a properly keyed card. The Asus P2B-DS is, as far as I have been able to find, a PCI 2.1 board. -ksaihr
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