| How to Update U-Boot on Pico-imx6ul board |
| ----------------------------------------- |
| |
| Required software on the host PC: |
| |
| - imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader |
| |
| - dfu-util: http://dfu-util.sourceforge.net/releases/ |
| |
| Build U-Boot for Pico: |
| |
| $ make mrproper |
| $ make pico-imx6ul_defconfig |
| $ make |
| |
| This will generate the U-Boot binary called u-boot.imx. |
| |
| Put pico board in USB download mode (refer to the document |
| http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdf page 15) |
| |
| Connect a USB to serial adapter between the host PC and pico |
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| Connect a USB cable between the OTG pico port and the host PC |
| |
| Open a terminal program such as minicom |
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| Copy u-boot.imx to the imx_usb_loader folder. |
| |
| Load u-boot.imx via USB: |
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| $ sudo ./imx_usb u-boot.imx |
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| Then U-Boot should start and its messages will appear in the console program. |
| |
| Use the default environment variables: |
| |
| => env default -f -a |
| => saveenv |
| |
| Run the DFU command: |
| => dfu 0 mmc 0 |
| |
| Transfer u-boot.imx that will be flashed into the eMMC: |
| |
| $ sudo dfu-util -D u-boot.imx -a boot |
| |
| Then on the U-Boot prompt the following message should be seen after a |
| successful upgrade: |
| |
| #DOWNLOAD ... OK |
| Ctrl+C to exit ... |
| |
| Remove power from the pico board. |
| |
| Put pico board into normal boot mode |
| |
| Power up the board and the new updated U-Boot should boot from eMMC. |
