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@@ -20,10 +20,63 @@ You will find in output/images/ the following files:
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- rootfs.ext4
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- rootfs.tar
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- sdcard.img
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- - u-boot.img
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+ - u-boot-dtb.img
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- SPL
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- zImage
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+Flash U-Boot and SPL
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+=====
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+
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+Note: This method is convenient for development purposes.
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+If the eMMC has already a U-Boot flashed with DFU support then
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+the user can go to step 2 below in order to update U-Boot.
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+
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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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+
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+Connect a USB to serial adapter between the host PC and pico.
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+
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+Connect a USB cable between the OTG pico port and the host PC.
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+
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+Note: Some computers may be a bit strict with USB current draw and will
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+shut down their ports if the draw is too high. The solution for that is
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+to use an externally powered USB hub between the board and the host computer.
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+
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+Open a terminal program such as minicom.
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+
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+Copy SPL and u-boot-dtb.img to the imx_usb_loader folder.
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+
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+Load the SPL binary via USB:
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+
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+$ sudo ./imx_usb SPL
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+
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+Load the u-boot-dtb.img binary via USB:
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+
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+$ sudo ./imx_usb u-boot-dtb.img
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+
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+Then U-Boot starts and its messages appear in the console program.
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+
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+Use the default environment variables:
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+
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+=> env default -f -a
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+=> saveenv
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+
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+Run the DFU agent so we can flash the new images using dfu-util tool:
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+
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+=> dfu 0 mmc 0
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+
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+Flash SPL and u-boot-dtb.img into the eMMC running the following commands on a PC:
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+
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+$ sudo dfu-util -D SPL -a spl
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+
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+$ sudo dfu-util -D u-boot-dtb.img -a u-boot
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+
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+Remove power from the pico board.
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+
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+Put pico board into normal boot mode.
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+
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+Power up the board and the new updated U-Boot should boot from eMMC.
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+
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Flash the eMMC
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==============
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