To boot the root filesystem from the second partition of the SD card, please use the below U-Boot command to specify the second partition as the root device.
Additionally, refer Section “EXT4 Filesystem Customization” in the Software User Guide for detailed instructions and configuration steps.
env def -f -a
setenv sdboot 'mmc dev $sdbootdev && mmcinfo; echo Copying Linux from mmc$sdbootdev to RAM... && load mmc $sdbootdev ${fdt_addr_r} system.dtb && load mmc $sdbootdev ${kernel_addr_r} Image && booti ${kernel_addr_r} - ${fdt_addr_r}'
setenv bootargs 'earlycon clk_ignore_unused earlyprintk root=/dev/mmcblk1p2 rootfstype=ext4 rw rootwait cma=1024M'
boot
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Please find the detailed product information here:
ZU49/ZU39/ZU29DR RFSoC System on Module