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