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A portion of the Flash has been allocated for use with the Journaling Flash File System (JFFS).
The JFFS is mounted under the ‘/usr/’ directory in the standard µClinux distribution. For more
information on the JFFS consult Appendix B. The rest of the Flash contains the read-only file
system.
Figure 4. Layout of the Flash and Flash Schematic
Layout of the Flash
Flash memory stores the following system components:
• The Linux kernel, located at the beginning of flash.
• The root file system as a read-only file system situated immediately after the kernel.
• The Journaling Flash File System, which starts on the first sector boundary after the root file
system.
No special consideration is given to the Flash boot sectors, since there is no monitor or special
bootstrap. At reset, Flash memory is located at address 0x00000000 and is mirrored throughout
the memory since it is controlled by chip select CSA0. At bootup, the kernel, being at the
beginning of flash, is run immediately. One of the first actions of the kernel is to define the flash
Linux Kernel
Read-Only File
System
JFFS
10000000