U-Boot ext4 warning
From embeddedTS Manuals
| Note: | The ext4 filesystem can be used instead of ext3, but it may require additional options. U-Boot does not support the 64-bit addressing added as the default behavior in recent revisions of mkfs.ext4. If using e2fsprogs 1.43 or newer, the options -O ^64bit,^metadata_csum must be used with ext4 for proper compatibility. Older versions of e2fsprogs do not need these options passed for ext4 support nor are they needed for ext3.
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