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To boot from the SD card instead of the eMMC on the IMX8MP platform, you need to adjust the U-Boot environment variables. Here are the steps you should follow:
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Modify U-Boot Environment Variables:
- Check Boot Order: Ensure that the boot order prioritizes the SD card over the eMMC. You can do this by setting the appropriate environment variables such as
bootargsandbootcmd. - Set Bootargs: Use the command
setenv bootargs <your_sd_card_args>to specify the SD card as the source for the kernel and filesystem. - Set Bootcmd: Modify the
bootcmdvariable to ensure it attempts to boot from the SD card first. For example, you might set it tommc dev 1; mmc read ...to specify the SD card as the boot device.
- Check Boot Order: Ensure that the boot order prioritizes the SD card over the eMMC. You can do this by setting the appropriate environment variables such as
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Save Changes:
- After making changes to the environment variables, save them using the
saveenvcommand to make the changes persistent across reboots.
- After making changes to the environment variables, save them using the
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Verify SD Card Functionality:
- Use the
mmc listcommand in U-Boot to verify that the SD card is detected. - Ensure the SD card is properly formatted and contains a valid bootable image.
- Use the
By following these steps, you should be able to configure your IMX8MP platform to boot from the SD card instead of the eMMC.
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