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- 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
- Connect a USB cable between the OTG pico port and the host PC
- Open a terminal program such as minicom
- Copy u-boot.imx to the imx_usb_loader folder.
- Load u-boot.imx via USB:
- $ sudo ./imx_usb u-boot.imx
- 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.
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