We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
what are the minimum hardware requirements to setup wifi on arm-7 processors.
I'm not sure whether you mean ARMv7, ARM Cortex-M7, ARM Cortex-A7 or ARM7TDMI.
But if you're building your own board or interfacing to an evaluation board for instance, you could try a ESP8266 module, which you can communicate with using UART/USART. These small modules should work with any microcontroller which has a serial interface.
I'm mentioning those modules, because you can get them for prices as low as $4 (including shipping; it just takes a while before they arrive).
Of course, there are also Cortex-M3 and Cortex-M4 based microcontrollers with built-in WiFi support, but they will require some additional external components.