1How to Update U-Boot on Warp7 board 2---------------------------------- 3 4Required software on the host PC: 5 6- imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader 7 8- dfu-util: http://dfu-util.sourceforge.net/releases/ (if you are in a 9Debian distribution then you can get it via libdfu-dev package) 10 11- libusb: http://libusb.org/ (if you are in a Debian distribution 12then you can get it via libusb-dev and libusb-1.0-0-dev) 13 14In U-Boot folder, build U-Boot for Warp7: 15 16$ make mrproper 17$ make warp7_config 18$ make 19 20This will generate the U-Boot binary called u-boot.imx. 21 22Put warp7 board in USB download mode: 23 24Remove the CPU board from the base board then put switch 2 in the upper 25position 26 27Connect a USB to serial adapter between the host PC and warp7 28 29Connect a USB cable between the OTG warp7 port and the host PC 30 31Copy u-boot.imx to the imx_usb_loader folder. 32 33Load u-boot.imx via USB: 34 35$ sudo ./imx_usb u-boot.imx 36 37Then U-Boot should start and its messages will appear in the console program. 38 39Open a terminal program such as minicom 40 41Use the default environment variables: 42 43=> env default -f -a 44=> saveenv 45 46Run the DFU command: 47=> dfu 0 mmc 0 48 49Transfer u-boot.imx that will be flashed into the eMMC: 50 51$ sudo dfu-util -D u-boot.imx -a boot 52 53Then on the U-Boot prompt the following message should be seen after a 54successful upgrade: 55 56#DOWNLOAD ... OK 57Ctrl+C to exit ... 58 59Remove power from the warp7 board. 60 61Put warp7 board into normal boot mode (put the switch 2 in the lower position) 62 63Power up the board and the new updated U-Boot should boot from eMMC 64