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https://github.com/brain-hackers/u-boot-brain
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004eee86f1
Add the initial support for the pico-imx6 variants. DDR initialization is based on the TechNexion's U-Boot code. Signed-off-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
74 lines
1.8 KiB
Plaintext
74 lines
1.8 KiB
Plaintext
How to Update U-Boot on pico-imx6q/dl boards
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Required software on the host PC:
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- UUU: https://github.com/NXPmicro/mfgtools
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Build U-Boot for pico:
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$ make mrproper
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$ make pico-imx6_defconfig
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$ make
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This generates the SPL and u-boot-dtb.img binaries.
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1. Loading U-Boot via USB Serial Download Protocol
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Note: This method is convenient for development purposes.
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If the eMMC has already a U-Boot flashed then the user can
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go to step 2 below in order to update U-Boot.
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Put pico board in USB download mode (Refer to the following link for details:
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https://www.technexion.com/support/knowledgebase/boot-configuration-settings-for-pico-baseboards/).
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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 SPL and u-boot-dtb.img to the uuu folder.
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Load the U-Boot via USB:
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$ sudo ./uuu -v uuu_script
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where uuu_script contains the following:
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SDP: boot -f SPL
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SDPU: write -f u-boot-dtb.img -addr 0x10000000
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SDPU: jump -addr 0x10000000
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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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2. Flashing U-Boot into the eMMC
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The default U-Boot environment expects the use of eMMC user
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partition. To ensure we are using the proper eMMC partition for boot,
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please run:
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=> mmc partconf 0 0 0 0
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Next, run the DFU agent so we can flash the new images using dfu-util
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tool:
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=> dfu 0 mmc 0
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Flash SPL and u-boot-dtb.img into the eMMC running the following commands on a PC:
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$ sudo dfu-util -D SPL -a spl
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$ sudo dfu-util -D u-boot-dtb.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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