Support downloading firmware images with Host AP driver

configname: CONFIG_HOSTAP_FIRMWARE

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Support downloading firmware images with Host AP driver
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Configure Host AP driver to include support for firmware image
download. This option by itself only enables downloading to the
volatile memory, i.e. the card RAM. This option is required to
support cards that don't have firmware in flash, such as D-Link
DWL-520 rev E and D-Link DWL-650 rev P.

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