On Tue, Jun 22, 2010 at 5:36 PM, Larry Finger <Larry.Finger@xxxxxxxxxxxx> wrote: > Michael, > > I have some good news. The Netbook that came from John is suddenly > developing DMA errors for the BCM4312, even though it does not have a > Phoenix BIOS. I have no idea why it did not fail this way earlier, but at > least I have a machine to debug that failure. Suddenly developing DMA errors? Hmm... maybe it's a hardware issue with the card, from which wl can silently recover? > > My first discovery is that if PIO mode is to be used, it is not sufficient > to load the module with the "pio=1" option, but that both "qos=0" and > "nohwcrypt=1" options must also be used, at least for WPA/WPA2 networks. > No other combination works. In addition, the automatic failover to PIO > mode does not work unless those two options were used when the module was > loaded. Thus both of the following work: > > modprobe b43 pio=1 qos=0 nohwcrypt=1 > modprobe b43 qos=0 hwcrypt=1 > > The second example gets a fatal DMA error and resets the controller before > the network comes up. I tried setting the latter two options before the > controller reset call in the failover, but that did not work. > > If you have suggestions on changes in the switch from DMA to PIO mode, > please send them to me. In the meantime, I will be looking at differences > in the MMIO traces between wl and b43 to try to fix the DMA problem at the > source of the trouble. > > Larry > > _______________________________________________ > b43-dev mailing list > b43-dev@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/b43-dev > -- Vista: [V]iruses, [I]ntruders, [S]pyware, [T]rojans and [A]dware. :-) -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
