Hello Adrian On Wednesday, June 05, 2013 08:08:14 PM Adrian Chadd wrote: > I think that the zydas mac doesn't officially support 5/10mhz operation. Just checked, it looks like the bandwidth control is very similar to ath9k. The settings is controlled by Bit 3 and 2 in AR9170_PWR_REG_CLOCK_SEL (0x1d4008) 00 <-- default 01 <-- half There's a new firmware branch for this new feature: <https://github.com/chunkeey/carl9170fw/tree/halfandquarter> The patch for the carl9170 driver will come later... Once mac/nl/cfg80211 and userspace have support for the 5/10 MHz channel bandwidth. So, if you [(Mr.?) Wang] is interested, please help us testing and integrating the stack patchset into the kernel - NOW -: "Add support for 5 and 10 MHz channels" <http://www.spinics.net/lists/linux-wireless/msg107116.html> > > I've read the "otus" vendor driver and found that in the source file > > /HalPlus/OTUS_FB50/hpreg.h on > > line 1915,the comment says "Temporary discard channel that BW < 20MHz > > (5 or 10MHz) */ > > /* Our architecture does not implemnt it" > > I think either the driver does not implement the 5/10 channels or > > worse,the ar9170 chip does not support 5/10 mhz channel at all. I think "architecture" could be just the software. At least an ath9k spectral analyzer confirmed that at least the PHY can operate on 10 MHz channels in the 5GHz band. > > But 802.11j has 10mhz channel support.To comply with the 802.11j > > standard,the chip should support 10mhz channel width. Oh, I don't have a 802.11j copy handy, is it a mandatory or optional feature? > > Also the ar9170 MAC was indeed designed by ZyDaS berfore > > the company was taken over by Atheros. Do you know any 5 GHz solution from ZyDaS that sold as 802.11j compliant? > > It has some problems with long distance links. True, but again look at the vendor driver. I think it should be very easy to implement "set coverage class". The slot time can be set by "AR9170_MAC_REG_SLOT_TIME" register and the ack timeout should be in "AR9170_MAC_REG_ACK_EXTENSION". That's all the information I have. So what are you waiting for ;) Regards, Chr -- 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
