Hello,
Each image build creates a U-Boot, a kernel, and an image type based on the IMAGE_FSTYPES defined in the machine configuration file. Most machine configurations provide an SD card image (.wic) and a rootfs image (.tar). The SD card image contains a partitioned image (with U-Boot, kernel, rootfs, etc.) suitable for booting the corresponding hardware.
An SD card image file .wic contains a partitioned image (with U-Boot, kernel, rootfs, etc.) suitable for booting the corresponding hardware. To flash an SD card image, run the following command:
zstdcat <image_name>.wic.zst | sudo dd of=/dev/sd<partition> bs=1M conv=fsync
For more information on flashing, see Section "Preparing an SD/MMC card to boot" in the i.MX Linux User's Guide (UG10163)
Regards