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This paragraph assumes you boot Linux using rootfs placed on the USB or Ramdisk. And you switched the S3 DIP switch to “Boot from eMMC“ selected SDIO switch to the eMMC in the u-boot environment before jumping to Linux.
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setenv sdio_select emmc |
Also, you need to place copy bootloader files to the USB:
bl_bp-rzg2lc-solidrun.bin
fip-rzg2lc-solidrun.bin
rzg2lc_solidrun_buildroot-sd-xxxxxxx.img
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