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- 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)
- Connect a USB to serial adapter between the host PC and pico.
- Connect a USB cable between the OTG pico port and the host PC.
- Open a terminal program such as minicom.
- Copy u-boot.imx to the imx_usb_loader folder.
- Load u-boot.imx via USB:
- $ sudo ./imx_usb u-boot.imx
- 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.
- Put pico board into normal boot mode.
- 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.
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