SDIO 802.11 support

Hi All, I’m using FreeRTOS for a product using the arm7 processor (LPC2148). I am hoping to use the SDIO interface to drive an 802.11 card. This is mostly due to the small number of interface pins needed. Does anyone know of a company that I can get an SDIO WIFI driver from? or do I have to buy a commercial OS to get a driver? Thanks,     luis…