Altera Nios Development Board - Manual (Page 35)

Altera Corporation 2–27
July 2005 Nios Development Board Reference Manual, Stratix II Edition
Board Components
Flash Memory Partitions
The configuration controller expects user and factory configuration data
to be stored at fixed locations (offsets) in flash memory. In addition, the
factory-programmed reference design expects Nios II software and data
to exist at certain locations in flash memory.
Table 2–7 shows the
expected flash memory partitioning.
Note that this partitioning scheme is merely a convention used by the
configuration controller and the factory-programmed reference design.
Custom FPGA designs can use the flash memory space in any way
necessary.
1 Altera recommends that you do not overwrite the factory-
programmed flash memory contents. Without a valid factory
configuration, the configuration controller may not be able to
successfully configure the FPGA. If you alter the factory
configuration, you can restore the board to its factory-
programmed state.
See Appendix B, Restoring the Factory
Configuration .
User Application Space
The lower 8 MB of flash memory is the user application space. This is free
space for user designs to store code and data for Nios II programs. The
lower 2 MB of the user application space is factory-programmed with
code and data for a web server reference design. The Nios II IDE allows
you to compile Nios II programs and program them into the user
application space.
Table 2–7. Flash Memory Partitions
Offset Usage Factory-Programmed Content
0x00000000 - 0x000FFFFF
User Application Space (8 MB)
Web Server Software
0x00100000 - 0x001FFFFF Web Pages
0x00200000 - 0x007FFFFF
0x00800000 - 0x00BFFFFF User Configuration (4MB)
0x00C00000 - 0x00FEFFFF Factory Configuration (4032 KB) Nios II Processor Reference Design
0x00FF0000 - 0x00FFFFFF Persistent Data (64 KB) Network Settings for Web Server