Linux-firmware for Realtek rtl8192cu wifi dongle

[dungnb...@gmail.com]

Dear 
I'm using buildroot to build a custom root file system for BeagleBone. My application uses a wifi dongle (Realtek 8192 chipset). I rebuilt kernel image (ver 3.2.0) and the image and wifi dongle work well with Debian root file system. My problem is : the built buildroot root file system get firmware error when modprobe rtl8192cu: 

# modprobe rtl8192cu 
[  194.077442] cfg80211: Calling CRDA to update world regulatory domain 
Feb 15 08:01:23 beaglebone kern.info kernel: [  194.077442] cfg80211: Calling CRDA to update world regulatory domain 
[  194.171603] rtl8192cu: MAC address: 00:0f:13:59:0f:e1 
[  194.176981] rtl8192cu: Board Type 0 
Feb 15 08:01:23 beaglebone kern.info kernel: [  194.171603] rtl8192cu: MAC address: 00:0f:13:59:0f:e1 
Feb 15 08:01:23 beaglebone kern.info kernel: [  194.176981] rtl8192cu: Board Type 0 
[  255.203972] usbcore: registered new interface driver rtl8192cu 
# Feb 15 08:02:24 beaglebone kern.debug kernel: [  255.203643] rtl8192cu:rtl92cu_init_sw_vars():<0-0> Failed to request firmware! 
Feb 15 08:02:24 beaglebone kern.debug kernel: [  255.203668] rtlwifi:rtl_usb_probe():<0-0> Can't init_sw_vars. 
Feb 15 08:02:24 beaglebone kern.info kernel: [  255.203972] usbcore: registered new interface driver rtl8192cu 


I also chose the option: Target packages -> Hardware handling -> Frimware -> wifi firmware: 
     [ ] Marvell Wifi-Ex SD 8787 
     [ ] Ralink rt2501/rt61 
     [ ] Ralink rt73 
     [ ] Ralink rt27xx/rt28xx/rt30xx 
     [*] Realtek 81xx 
     [*] Realtek 87xx 
     [*] Realtek 88xx 
     [*] TI wl127x     
     [*] TI wl128x 
     [ ] TI wl18xx 
But it can not change the error 
Please help me 
Thank you

[Toan Pham]

Have you checked if you have the following firmware files:

/lib/firmware/rtlwifi/rtl8192cufw.bin

/lib/firmware/rtlwifi/rtl8192cufw_A.bin

/lib/firmware/rtlwifi/rtl8192cufw_B.bin

/lib/firmware/rtlwifi/rtl8192cufw_TMSC.bin

It is also possible to modify the driver to bypass firmware loading for that chipset and it will work just fine.  (I have done it before)

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[dungnb...@gmail.com]

Dear 
I'm using buildroot to build a custom root file system for Beaglebone. My application uses a wifi dongle (Realtek 8192 chipset). I rebuilt kernel image (ver 3.2.0) and the image and wifi dongle work well with Debian root file system. My problem is : the built buildroot root file system get firmware error when modprobe rtl8192cu: