mirror of
https://github.com/brain-hackers/u-boot-brain
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The DFU allows a more user friendly use as the details where the bootloader is installed are abstracted. Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
72 lines
1.5 KiB
Plaintext
72 lines
1.5 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 U-Boot binary called u-boot.imx.
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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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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.
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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 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 into the eMMC:
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$ sudo dfu-util -D SPL -a spl
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Flash u-boot.img into the eMMC:
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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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Building U-Boot to boot with NXP 4.1 kernel:
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The NXP 4.1 kernel boots only in secure boot mode on mx7.
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Follow the next steps to enable secure boot:
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$ make mrproper
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$ make pico-imx7d_defconfig
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$ make menuconfig
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-> ARM architecture
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-> [*] Enable support for booting in non-secure mode
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-> [*] Boot in secure mode by default
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-> Exit
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$ make
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Flash u-boot.imx using the imx_usb_loader tool.
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