1How to Update U-Boot on Pico-imx6ul 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
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8- dfu-util: http://dfu-util.sourceforge.net/releases/
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10Build U-Boot for Pico:
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12$ make mrproper
13$ make pico-imx6ul_defconfig
14$ make
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16This will generate the U-Boot binary called u-boot.imx.
17
18Put pico board in USB download mode (refer to the document
19http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdf page 15)
20
21Connect a USB to serial adapter between the host PC and pico
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23Connect a USB cable between the OTG pico port and the host PC
24
25Open a terminal program such as minicom
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27Copy u-boot.imx to the imx_usb_loader folder.
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29Load u-boot.imx via USB:
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31$ sudo ./imx_usb u-boot.imx
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33Then U-Boot should start and its messages will appear in the console program.
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35Use the default environment variables:
36
37=> env default -f -a
38=> saveenv
39
40Run the DFU command:
41=> dfu 0 mmc 0
42
43Transfer u-boot.imx that will be flashed into the eMMC:
44
45$ sudo dfu-util -D u-boot.imx -a boot
46
47Then on the U-Boot prompt the following message should be seen after a
48successful upgrade:
49
50#DOWNLOAD ... OK
51Ctrl+C to exit ...
52
53Remove power from the pico board.
54
55Put pico board into normal boot mode
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57Power up the board and the new updated U-Boot should boot from eMMC.
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