69 lines
1.7 KiB
Plaintext
69 lines
1.7 KiB
Plaintext
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 SPL and u-boot.img binaries.
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1. Loading U-Boot via USB Serial Download Protocol
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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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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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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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Open a terminal program such as minicom.
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Copy SPL and u-boot.img to the imx_usb_loader folder.
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Load the SPL binary via USB:
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$ sudo ./imx_usb SPL
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Load the u-boot.img binary via USB:
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$ sudo ./imx_usb u-boot.img
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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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2. Flashing U-Boot into the eMMC
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Run the DFU agent so we can flash the new images using dfu-util tool:
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=> dfu 0 mmc 0
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Flash SPL and u-boot.img into the eMMC running the following commands on a PC:
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$ sudo dfu-util -D SPL -a spl
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$ sudo dfu-util -D u-boot.img -a u-boot
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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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