June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Root filesystem
The root filesystem contains the essential system libraries, utilities, and scripts needed to make the system work. It is very desirable to be able to replace and upgrade all of these. The mechanism depends on the implementation. Common formats for embedded root file systems are:
- Ramdisk, loaded from raw flash memory or a disk image at boot. To update it, you just need to overwrite the ramdisk image and reboot.
- Read-only compressed filesystems, such as squashfs, stored in a flash partition. Since these types of filesystem do not implement a write function, the only way to update them is to write a complete filesystem image to the partition.
- Normal filesystem types. For raw flash memory, JFFS2 and UBIFS formats are common, ...
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