I am working on AM3715 and TPS65951 board, Android version is ICS4.0.3, Linux kernel version is 2.3.7.when I plug the usb cable to pc, pc can find the mmc card on board as usb mass storage,but the transfer speed is too slow,write speed about at 700KB~1.3MB/s.But when I run antutu benchmark on board, the mmc write speed can reach at 5MB/s, someone can give me some advice? By the way,I find some pcs cannot detect the mmc via usb cable, but some pcs can detect.