Embedded Linux for Developers

Filesystem choices

So far we have looked at the technology behind solid state memory and at the many types of filesystems. Now it is time to summarize the options.

In most cases, you will be able to divide your storage requirements into these three categories:

• Permanent, readable, and writable data: Runtime configuration, network parameters, passwords, data logs, and user data
• Permanent, read-only data: Programs, libraries, and configurations files that are constant, for example, the root filesystem
• Volatile data: Temporary storage for example /tmp

The choices for read-write storage are as follows:

• NOR: UBIFS or JFFS2
• NAND: UBIFS, JFFS2, or YAFFS2
• eMMC: ext4 or F2FS

  Note

  For read-only storage, you can use all of the above mounted with the ro attribute. ...