How to update U-Boot on pico-imx7d 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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Build U-Boot for pico:
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$ make mrproper
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$ make pico-imx7d_defconfig
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$ make
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This generates the U-Boot binary called u-boot.imx.
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Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide
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page 3)
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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 starts and its messages 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 UMS command:
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=> ums 0 mmc 0
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Transfer u-boot.imx to be flashed into the eMMC:
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$ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1; sync
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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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