Multiple PCI HostAP Cards
Mon Apr 5 22:34:13 PDT 2004
On Tuesday 06 April 2004 05:30, Pavel Roskin wrote:
> On Mon, 5 Apr 2004, Christopher Dobbs wrote:
> > I used the source listing to develope an idea of the situation. I will
> > admit that I am not any good at writing PCI drivers, but it looks from
> > the code that the driver software is only keeping track of the last card
> > that it sees.
> What happens is that hostap_pci probes 3 cards but only the last of them
> can be initialized. The first two fail. The working card gets wlan0.
> Later hostap_cs probes a PCMCIA card, which fails. However, it's not
> unregistered, so it keeps wlan1.
> The PCI cards seem to be identical. The only difference is the IRQ they
> use. It is possible that the cards don't work because of strong radio
> interference which confuses the firmware. Or they draw too much power
> from the motherboard. But I'm just guessing here.
> By the way, you are using hostap version 0.0.1, which is very old. Try at
> least 0.1.3 or 0.2.0.
> Firmware upgrade can also help with some inexplicable problems. The
> latest available secondary firmware for Prism 2.5 is 1.8.0, although some
> users recommend 1.7.4 as the most stable firmware. Primary firmware
> should be updated too. See HOWTO for Prism firmware:
> I have never used more than one PCI card, but the code seems to be safe.
> I don't see any potential problem. Beside, the first card would not have
> problems with initialization if that was the reason.
I use two cards (actually, four cards in two boxes). Works ok.
One box have third, non-Prism2 card, too.
BTW, cards seems to talk to each other via RF generated on mobo
circuitry ;) You need to set them at least 6 channels apart
to get rid of interference.
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