Quoted from readme.txt :
This is a USBMSC host software implementation and will require USBMSC firmware (built using sdk 2.400 or later) with matching USBMSC Vendor and Product IDs as well as matching SCSI VENDOR and PRODUCT IDs. The firmware binaries shipped with this host, if any, were used to test your host applications and drivers on SigmaTel development hardware. You must replace the SigmaTel binaries with your hardware-specific firmware for proper operation of your player.
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