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To configure U-Boot to load the kernel from the /boot directory within your rootfs partitions, you’ll need to modify the U-Boot environment variables. This involves adjusting the boot command sequence to point to the kernel and device tree files located in the /boot directory of your rootfs partitions.
Here’s how you can do it:
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Access the U-Boot Console: During the boot process, interrupt the autoboot by pressing any key to access the U-Boot console.
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Modify the Boot Command: You need to change the
bootcmdenvironment variable to load the kernel from the desired rootfs partition. Typically, this involves setting thebootargsandloadcommands to point to the correct partition and file paths.For example, if your rootfs partitions are on mmcblk0p2 and mmcblk0p3, you might set:
setenv bootargs 'root=/dev/mmcblk0p2 ro rootwait console=tty1 console=ttymxc2' setenv loadkernel 'ext4load mmc 0:2 ${loadaddr} /boot/zImage' setenv loadfdt 'ext4load mmc 0:2 ${fdt_addr} /boot/imx8mp-verdin.dtb' setenv bootcmd 'run loadkernel; run loadfdt; bootz ${loadaddr} - ${fdt_addr}' saveenvMake sure to adjust the partition numbers and file paths according to your setup.
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Save the Changes: Use the
saveenvcommand to save your changes to the U-Boot environment. -
Reboot: Restart the system to apply the changes.
By following these steps, U-Boot should load the kernel from the /boot directory within the specified rootfs partition. Ensure that the paths and partition numbers match your specific configuration. If you encounter any issues, double-check the file paths and partition identifiers used in the commands.
I hope this helps! If you have any more questions, feel free to ask.
Best regards,
Toradex AI Assistant.
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