example:
boot system flash slot0:c1600−sy−l.122−1a.bin
This forces the RxBoot to look for the file "c1600−sy−l.122−1a.bin" on the Flash device called "slot0:". The boot system directive in the router configuration file overrides the configuration register. If there is no boot system statement, and if the configuration register is at its default value, then the RxBoot grabs the first file it finds in its Flash. If that fails, it tries to load an image from boot ROM.
3.The Cisco IOS software creates some data structures such as Interface Descriptor Blocks (IDBs) in the main processor memory, carve interface, and system buffers on shared input/output (I/O) memory, and loads the startup configuration. RxBoot also performs these functions, but it does not re−analyze the hardware unless the full Cisco IOS software is executed.
Below is an example of this platform booting from Flash:
3w4d: %SYS−5−RELOAD: Reload requested
System Bootstrap, Version 11.1(7)AX [kuong (7)AX], EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)
Copyright (c) 1994−1996 by cisco Systems, Inc.
C1600 processor with 18432 Kbytes of main memory
program load complete, entry point: 0x4018060, size: 0x1da950
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