| How to update U-Boot on pico-imx7d board |
| ---------------------------------------- |
| |
| Required software on the host PC: |
| |
| - imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader |
| |
| Build U-Boot for pico: |
| |
| $ make mrproper |
| $ make pico-imx7d_defconfig |
| $ make |
| |
| This generates the U-Boot binary called u-boot.imx. |
| |
| Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide |
| 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. |
| |
| 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 starts and its messages appear in the console program. |
| |
| Use the default environment variables: |
| |
| => env default -f -a |
| => saveenv |
| |
| Run the UMS command: |
| => ums 0 mmc 0 |
| |
| Transfer u-boot.imx to be flashed into the eMMC: |
| |
| $ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1; sync |
| |
| 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. |
| |
| Building U-Boot to boot with NXP 4.1 kernel: |
| |
| The NXP 4.1 kernel boots only in secure boot mode on mx7. |
| |
| Follow the next steps to enable secure boot: |
| |
| $ make mrproper |
| $ make pico-imx7d_defconfig |
| $ make menuconfig |
| -> ARM architecture |
| -> [*] Enable support for booting in non-secure mode |
| -> [*] Boot in secure mode by default |
| -> Exit |
| $ make |
| |
| Flash u-boot.imx using the imx_usb_loader tool. |
