I came across the support for EMD1 in mater branch and tried it on the device I have access to. Things are looking good (it needs separate board file from package ipq-wifi-engenius_emd1). I have observed couple of issues with 5GHz, the main one being if I configure it to be both 'station' and 'ap', although there are no errors in log and hostapd says that AP has started successfully the SSID can't be found from other devices. If put 5Ghz only in AP mode it works fine. There is no similar issue with 2GHz. I have tried all firmware and driver combinations (ct, ct-htt, non-ct) the issue remains the same.
The other issue being 5Ghz as station connecting my Netgear WAC124 puts out
Mon Feb 15 21:42:15 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=38) and center freq 1 (=5795) not in sync
My wireless config looks like this
config wifi-device 'radio0'
option type 'mac80211'
option channel 'auto'
option hwmode '11g'
option path 'platform/soc/a000000.wifi'
option country 'US'
option legacy_rates '0'
option cell_density '0'
option htmode 'HT40+'
config wifi-iface 'wifi2g_client'
option device 'radio0'
option mode 'sta'
option ifname 'wlan0-c'
option ssid 'XXXXXXXXX'
option encryption 'psk2'
option key 'XXXXXXXXXXXXXXXXX'
option network 'wwan'
option disabled '1'
config wifi-iface 'wifi2g_master'
option device 'radio0'
option mode 'ap'
option ifname 'wlan0-m'
option encryption 'psk2'
option ssid 'TTX2'
option key 'XXXXXXXXXXXXXXXXXXX'
option network 'lan'
option disabled '1'
config wifi-device 'radio1'
option type 'mac80211'
option channel 'auto'
list channels '36 40 44 48 149 153 157 161 165'
option hwmode '11a'
option path 'platform/soc/a800000.wifi'
option country 'US'
option htmode 'VHT40'
option cell_density '2'
option legacy_rates '0'
config wifi-iface 'wifi5g_master'
option device 'radio1'
option mode 'ap'
option ifname 'wlan1-m'
option encryption 'psk2'
option ssid 'TTX5'
option key 'XXXXXXXXXXXXXXXXXXX'
option network 'lan'
config wifi-iface 'wifi5g_client'
option device 'radio1'
option mode 'sta'
option ifname 'wlan1-c'
option ssid 'XXXXXXXXX'
option encryption 'psk2'
option key 'XXXXXXXXXXXXXXXXX'
option network 'wan'
Looking for some help on this to get 5GHz going in AP and Station mode.