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wifi drivers

I just plug in a marvell SD card, it detects it, but in which directory I should put the sd8686.bin, sd8686_helper.bin

right now is in the /lib/modules/2.6.32.17-davinci1/source/firmware but cant detected there, how can I find out the path that is set for the drivers?

mmc0: new SDIO card at address 0001                                             
libertas_sdio mmc0:0001:1: firmware: requesting sd8686_helper.bin               
libertas: can't load helper firmware                                            
libertas: failed to load helper firmware                                        
libertas_sdio: probe of mmc0:0001:1 failed with error -2