README
1How to update U-Boot on pico-imx7d board
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4Required software on the host PC:
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6- imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader
7
8Build U-Boot for pico:
9
10$ make mrproper
11$ make pico-imx7d_defconfig
12$ make
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14This generates the U-Boot binary called u-boot.imx.
15
16Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide
17page 3)
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19Connect a USB to serial adapter between the host PC and pico.
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21Connect a USB cable between the OTG pico port and the host PC.
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23Open a terminal program such as minicom.
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25Copy u-boot.imx to the imx_usb_loader folder.
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27Load u-boot.imx via USB:
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29$ sudo ./imx_usb u-boot.imx
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31Then U-Boot starts and its messages appear in the console program.
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33Use the default environment variables:
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35=> env default -f -a
36=> saveenv
37
38Run the UMS command:
39=> ums 0 mmc 0
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41Transfer u-boot.imx to be flashed into the eMMC:
42
43$ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1; sync
44
45Remove power from the pico board.
46
47Put pico board into normal boot mode.
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49Power up the board and the new updated U-Boot should boot from eMMC.
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