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- How to Update U-Boot on pico-imx6q/dl boards
- --------------------------------------------
- Required software on the host PC:
- - UUU: https://github.com/NXPmicro/mfgtools
- Build U-Boot for pico:
- $ make mrproper
- $ make pico-imx6_defconfig
- $ make
- This generates the SPL and u-boot-dtb.img binaries.
- 1. Loading U-Boot via USB Serial Download Protocol
- Note: This method is convenient for development purposes.
- If the eMMC has already a U-Boot flashed then the user can
- go to step 2 below in order to update U-Boot.
- Put pico board in USB download mode (Refer to the following link for details:
- https://developer.technexion.com/docs/pico-evaluation-kit-boot-mode-settings )
- 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 SPL and u-boot-dtb.img to the uuu folder.
- Load the U-Boot via USB:
- $ sudo ./uuu -v uuu_script
- where uuu_script contains the following:
- SDP: boot -f SPL
- SDPU: write -f u-boot-dtb.img -addr 0x10000000
- SDPU: jump -addr 0x10000000
- Then U-Boot starts and its messages appear in the console program.
- Use the default environment variables:
- => env default -f -a
- => saveenv
- 2. Flashing U-Boot into the eMMC
- The default U-Boot environment expects the use of eMMC user
- partition. To ensure we are using the proper eMMC partition for boot,
- please run:
- => mmc partconf 0 0 0 0
- Next, run the DFU agent so we can flash the new images using dfu-util
- tool:
- => dfu 0 mmc 0
- Flash SPL and u-boot-dtb.img into the eMMC running the following commands on a PC:
- $ sudo dfu-util -D SPL -a spl
- $ sudo dfu-util -D u-boot-dtb.img -a u-boot
- 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.
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