Support for non-volatile firmware download

configname: CONFIG_HOSTAP_FIRMWARE_NVRAM

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Support for non-volatile firmware download
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Allow Host AP driver to write firmware images to the non-volatile
card memory, i.e. flash memory that survives power cycling.
Enable this option if you want to be able to change card firmware
permanently.

Firmware image downloading needs a user space tool, prism2_srec.
It is available from http://hostap.epitest.fi/.