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Introduction
load the application, but since that requires only read-only access, no imposing program is
required. The ROM boot-loaders in some CPUs can check the root directory of a SD card for
a binary in addition to the more usual locations such as external NAND or NOR flash.
1-4 WHY FAT?
File Allocation Table (FAT) is a simple file system, widely supported across major OSs.
While it has been supplanted as the format of hard drives in Windows PCs, removable
media still use FAT because of its wide support. That is suitable for embedded systems,
which would often be challenged to muster the resources for the modern file systems
developed principally for large fixed disks.
μC/FS supports FAT because of the interoperability requirements of removable media,
allowing that a storage medium be removed from an embedded device and connected to a
PC. All variants and extensions are supported to specification.
A notorious weakness of FAT (exacerbated by early Windows system drivers) is its non-fail
safe architecture. Certain operations leave the file system in an inconsistent state, albeit
briefly, which may corrupt the disk or force a disk check upon unexpected power failure.
μC/FS minimizes the problem by ordering modifications wisely. The problem is completely
solved in an optional journaling module which logs information about pending changes so
those can be resumed on start-up after a power failure.
1-5 CHAPTER CONTENTS
Figure 1-1 shows the layout and flow of the book. This diagram should be useful to
understand the relationship between chapters. The first (leftmost) column lists chapters that
should be read in order to understand μC/FS’s structure. The chapters in the second column
give greater detail about the application of μC/FS. Each of the chapters in the third column
examines a storage technology and its device driver. Finally, the fourth column lists the
appendices, the topmost being the μC/FS reference, configuration and porting manuals.
Reference these sections regularly when designing a product using μC/FS.
18
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