On Sunday 01 July 2007 17:00:06 Lennert Buytenhek wrote: > On Sun, Jul 01, 2007 at 12:23:16PM +0200, Michael Buesch wrote: > > > > More or less. You can't add the resistances like that, since the > > > bus isolation chip buffers the IDSEL signal, but it is correct that > > > if the host's IDSEL resistor is larger than a certain value, the > > > combination of the resistive coupling of IDSEL plus the extra buffer > > > in the isolator might be causing the IDSEL input on the 'guest' PCI > > > board to assert too late (or not assert at all), causing config > > > accesses to fail. > > > > > > (This also depends on the specific 'guest' PCI board used, as you > > > noted, due to differing IDSEL trace lengths/capacitances and input > > > pin capacitances on different PCI boards. Also, it might work at > > > 33 MHz but not work at 66 MHz, etc.) > > > > It doesn't work on any of my boards :( > > What extender board is this? Do you have docs/schematics?
catalyst pcibx32 http://bu3sch.de/pcibx.php Docs yes, schematics no. > And what motherboard brand/type? ABit AI7 The other was some MSI and some very old random board. dunno. It works perfectly fine with other cards, like a linksys wlan card with a broadcom 4318 chip. It's just the b44 that doesn't work in the extender. > Actually, the IDSEL resistor would be on the computer's > motherboard, not on the PCI board. And to which address line Yeah, I know. > the IDSEL line is connected depends on which PCI slot on the > motherboard you're looking at. Sure. > A multimeter should do the trick, but I would advise against this > if you're not totally comfortable with hacking hardware. Well, you mean to measure the idsel against each possible AD line? It's difficult, because the motherboard is inside of a standard computer case and a watercooling system is mounted. So I would have to disassemble all that stuff. :/ Probably I can measure it with very thin probes on the slots without unmounting the board, hm... -- Greetings Michael. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
