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The created SD card has the following structure:
* raw sectors for the bootloader storage: typically this is an 8MB raw part that stores the bootloader binaries (like <code>imx9_flash.bin</code>) for the bootrom startup
* <code>FAT32</code> first partition: this will be mapped to the <code>/dev/mmcblkXp1mmcblk1p1</code> device in Linux
** usually this partition contains the Linux kernel binary and the device tree blob
** splash screen image is stored in this partition too for a splash image showing during U-Boot startup
* <code>ext4</code> second partition: this will be mapped to the <code>/dev/mmcblkXp2mmcbl1Xp2</code> device in Linux
** this partition contains the Linux ''root file system''
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