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open-sdr / openwifi

open-source IEEE 802.11 WiFi baseband FPGA (chip) design: driver, software
GNU Affero General Public License v3.0
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error in running openwifi ap with country_code=CN #44

Closed charlesLuoc closed 3 years ago

charlesLuoc commented 3 years ago

Hi, Xianjun 'openwifi' AP runs well on my zed board + FMCOMMS3 when i operate according to Section Quick start of README.md. But after changing the country_code from BE to CN, I found the following errors: " 155.617286: 155.617291: sdr0: IEEE 802.11 Configured channel (44) not found from the channel list of current mode (2) IEEE 802.11a 155.617592: 155.617601: sdr0: IEEE 802.11 Hardware does not support configured channel " The modified hostapd-openwifi_5G_try.txt and entire log are given in attachment. Serial_11-28-145518.log hostapd-openwifi_5G_try.txt

weiliu1011 commented 3 years ago

Hi Charles, I think this issue is not related to openwifi itself. Basically if you set country code to CN, if you run iw reg get, you will see below:

root@analog:~/openwifi_cap# iw reg get country CN: (2402 - 2482 @ 40), (N/A, 20) (5735 - 5835 @ 40), (N/A, 30) (57240 - 59400 @ 2160), (N/A, 28) (59400 - 63720 @ 2160), (N/A, 44) (63720 - 65880 @ 2160), (N/A, 28) If you set country code for US, you will see: root@analog:~/openwifi_cap# iw reg get country US: (2402 - 2472 @ 40), (3, 27) (5170 - 5250 @ 40), (3, 17) (5250 - 5330 @ 40), (3, 20), DFS (5490 - 5600 @ 40), (3, 20), DFS (5650 - 5710 @ 40), (3, 20), DFS (5735 - 5835 @ 40), (3, 30) (57240 - 63720 @ 2160), (N/A, 40) By comparing the output, we see the channel 44 (5220 MHz) is not among the enabled channel for country CN, but it is enabled in US or BE. Further google results show that this is determined by regulation database file /lib/crda/regulatory.bin, This is a binary file read by linux, more information see https://wireless.wiki.kernel.org/en/developers/regulatory/wireless-regdb#mailing_list_for_regulatory_updates.

I think because the linux distribution is slightly old, so the regulatory database is not up to date. If you must use CN code, then you need to update the database correspondingly. Wei

charlesLuoc commented 3 years ago

But for country_code CN,I changed channel to 159. Similar error occurs:

60.024549: 60.024554: sdr0: IEEE 802.11 Configured channel (159) not found from the channel list of current mode (2) IEEE 802.11a 60.024847: 60.024855: sdr0: IEEE 802.11 Hardware does not support configured channel 60.024917: Could not select hw_mode and channel. (-3)

JiaoXianjun commented 3 years ago

Would you please check this part to add support (country, channel, etc) by yourself? https://github.com/open-sdr/openwifi/tree/master/doc#Regulation-and-channel-config