1How to Update U-boot on Warp 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/ 9 10Build U-boot for Warp: 11 12$ make mrproper 13$ make warp_config 14$ make 15 16This will generate the U-boot binary called u-boot.imx. 17 18Put warp board in USB download mode 19 20Connect a USB to serial adapter between the host PC and warp 21 22Connect a USB cable between the OTG warp port and the host PC 23 24Open a terminal program such as minicom 25 26Copy u-boot.imx to the imx_usb_loader folder. 27 28Load u-boot.imx via USB: 29 30$ sudo ./imx_usb u-boot.imx 31 32Then U-boot should start and its messages will appear in the console program. 33 34Use the default environment variables: 35 36=> env default -f -a 37=> saveenv 38 39Run the DFU command: 40=> dfu 0 mmc 0 41 42Transfer u-boot.imx that will be flashed into the eMMC: 43 44$ sudo dfu-util -D u-boot.imx -a boot 45 46Then on the U-boot prompt the following message should be seen after a 47successful upgrade: 48 49#DOWNLOAD ... OK 50Ctrl+C to exit ... 51 52Remove power from the warp board. 53 54Put warp board into normal boot mode 55 56Power up the board and the new updated U-boot should boot from eMMC 57