Add a README file to help users to install U-boot binary into the eMMC. Signed-off-by: Vanessa Maegima <vanessa.maegima@nxp.com> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>master
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How to Update U-Boot on Pico-imx6ul 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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- dfu-util: http://dfu-util.sourceforge.net/releases/ |
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Build U-Boot for Pico: |
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$ make mrproper |
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$ make pico-imx6ul_defconfig |
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$ make |
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This will generate the U-Boot binary called u-boot.imx. |
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Put pico board in USB download mode (refer to the document |
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http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdf page 15) |
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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 should start and its messages will 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 DFU command: |
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=> dfu 0 mmc 0 |
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Transfer u-boot.imx that will be flashed into the eMMC: |
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$ sudo dfu-util -D u-boot.imx -a boot |
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Then on the U-Boot prompt the following message should be seen after a |
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successful upgrade: |
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#DOWNLOAD ... OK |
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Ctrl+C to exit ... |
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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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