When booting, a router may detect that a Cisco IOS software image is corrupt, return the compressed image checksum is incorrect message, and attempt to reload, reporting the event as a software-forced crash:
Error : compressed image checksum is incorrect 0x54B2C70A
Expected a checksum of 0x04B2C70A
*** System received a Software forced crash ***
signal= 0x17, code= 0x5, context= 0x0
PC = 0x800080d4, Cause = 0x20, Status Reg = 0x3041f003
This can be caused by a Cisco IOS software image that has actually been corrupted during transfer to the router, in which case it can be resolved by loading a new image onto the router. [Search for a ROMMON recovery method for your platform here
It may also be caused by faulty memory hardware or by a software bug.