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rtl8192cu with Edimax 7811UN and IMX6

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Goodmorning.
My name's Mauro Ziliani and I write from Parma, Italy.
I need to plug he dongle Edimax 7811UN into a IMX6DLSABRESD board, using kerne 4.1.15  (Yocto Krogoth)

I have the following problem.
I switch on the board wth dongle plugged.
I try a sftp transfer from my PC and the board. All works fine.

I wait for some minute, I retry the transfer, but the board doesn't start to receive the file, and the file stay for some minuti waiting to start.
Than the PC goes in timeout

This is what I do

1. scp app_1.0_armhf.deb root@imx6dlsabresd:/home/root
The transfer is completed. The progress bar is shown and the amount of transfered data

2. I wait some minutes
...
...
I retry the transfer
scp app_1.0_armhf.deb root@imx6dlsabresd:/home/root

the PC wait for 5 minute about and then it goes to timeout.

On the imx6dlsabresd board dmesg tells nothing of interesting

Looking with iwconfig wlan0 I get this


wlan0     IEEE 802.11bgn  ESSID:"STUDIO"
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:0C:E6:0A:3E:CA
          Bit Rate=72.2 Mb/s   Tx-Power=20 dBm
          Retry short limit:7   RTS thr=2347 B   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=62/70  Signal level=-48 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:240   Missed beacon:0

The power management is always off


Where I can look to get some more information on this strange behaviour?

There is a mini-cd sold with the dongle Edimax, but the linux driver is for kernel 3.x


Best regards,
  Mauro Ziliani




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