如题
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感谢楼上两位大佬，我大概明白了，
ubifs是用mkfs.ubifs生成的，不能直接烧录到flash,
而ubi文件是ubinize文件生成的，可以直接烧录到nand flash,
ubi文件包含上面生成的ubifs文件，并且在cfg配置文件给该img文件起一个卷名(volume name)
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https://www.digi.com/support/knowledge-base/difference-between-ubifs-and-ubi-file-systems-on-c
The UBIFS image is a file system image.It works on top of a UBI volume.You cannot flash it on the raw flash device */dev/mtd*. You need to create UBI volume first and then update the volume with UBIFS image.
The UBI image is a UBI volume image. It uses the UBIFS image and some other metadata to create a volume on top of a raw flash device */dev/mtd*. In other words you can flash directly a UBI image with standard *nandwrite* command using the '/dev/mtdx' char device.
On CCWi-i.MX51 or CCWi-i.MX53 platforms , u-boot requires UBIFS image, because the internals of u-boot will create the UBI volume and then updates it with UBIFS image.
The UBI image is meant to be used directly by the operating system (Linux/Android), but at the moment Digi use it only on Linux.
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Question
What is the difference between UBI and UBIFS?
Answer
The UBI subsystem works on top of MTD devices and provides a notion of UBI volumes. UBIFS filesystem works on top of UBI volumes.
The UBIFS is done with the mkfs.ubifs command and the UBI is done with ubinize command.
SAM-BA and the U-Boot nand write.trimffs command expect a UBI file.
https://microchipsupport.force.com/s/article/What-is-the-difference-between-UBI-and-UBIFS
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