RT5572STA interface doesn't support scanning

I am using RT5572 USB Wifi adapter,after build able to load the driver but when we tried to scan the network using command line, got an error "interface doesn't support scanning" . i have download source from http://ift.tt/1qaV76X

and use following commands to build:

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Build Instructions:

1> $tar -xvzf DPB_RT2870_Linux_STA_x.x.x.x.tgz go to "./DPB_RT2870_Linux_STA_x.x.x.x" directory. 2> In Makefile set the "MODE = STA" in Makefile and chose the TARGET to Linux by set "TARGET = LINUX" define the linux kernel source include file path LINUX_SRC modify to meet your need.

3> In os/linux/config.mk define the GCC and LD of the target machine define the compiler flags CFLAGS modify to meet your need. ** Build for being controlled by NetworkManager or wpa_supplicant wext functions Please set 'HAS_WPA_SUPPLICANT=y' and 'HAS_NATIVE_WPA_SUPPLICANT_SUPPORT=y'. => #>cd wpa_supplicant-x.x => #>./wpa_supplicant -Dwext -ira0 -c wpa_supplicant.conf -d 4> $make # compile driver source code # To fix "error: too few arguments to function ¡¥iwe_stream_add_event" => $patch -i os/linux/sta_ioctl.c.patch os/linux/sta_ioctl.c

5> $cp RT2870STA.dat /etc/Wireless/RT2870STA/RT2870STA.dat 6> load driver, go to "os/linux/" directory. #[kernel 2.6] # $/sbin/insmod rt2870sta.ko # $/sbin/ifconfig ra0 inet YOUR_IP up

i am not able to understand the meaning of => #>cd wpa_supplicant-x.x => #>./wpa_supplicant -Dwext -ira0 -c wpa_supplicant.conf -d in step 3.