刷机工具DFU-UTIL
此部分会用到mpi-r-tools.zip压缩包中的dfu-util.exe
1. 让MPi-R处于FEL模式。
2. 运行from-fel-to-dfu.bat脚本，双击运行。或者在Windows命令行运行脚本中的命令。
3. 此时，MPi-R会打印一些log，当看到这些时，表明MPi-R已处于DFU模式。
DFU waiting on SPI-NOR... musb-hdrc: peripheral reset irq lost! DFU waiting on SPI-NOR... SF: Detected w25q128 with page size 256 Bytes, erase size 4 KiB, total 16 MiB
4. 
5. 准备好NAND镜像，然后在Windows命令行中通过如下命令刷机。
./dfu-util.exe -R -a all -D output\images\sysimage-nand.img
刷机log：
mango@DESKTOP MINGW64 /d/share/windows/mpi-R-tools $ ./dfu-util.exe -R -a all -D ../../sysimage-nand.img dfu-util 0.9 Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc. Copyright 2010-2016 Tormod Volden and Stefan Schmidt This program is Free Software and has ABSOLUTELY NO WARRANTY Please report bugs to http://sourceforge.net/p/dfu-util/tickets/ Opening DFU capable USB device... ID 1f3a:1010 Run-time device DFU version 0110 Claiming USB DFU Interface... Setting Alternate Setting #0 ... Determining device status: state = dfuIDLE, status = 0 dfuIDLE, continuing DFU mode device DFU version 0110 Device returned transfer size 4096 Copying data from PC to DFU device Download [== ] 11% 15249408 bytes