help: reconfiguration,error!

[Altera_Forum]

hello, 

my system includes cyclone1, epcs4, ext_flash,and so on. configuration data is stored in epcs, and nios program is stored in ext_flash. now, i compiled two projects, and they were only small differences in their *.flash format file, and i found the differences. i downloaded one .flash file into epcs, and in nios program i changed the different configuration data between the two .flash file. and then re_Por, i found fpga run by mistake. i don't know why. can anybody help? thanks!

[Altera_Forum]

I could not get you properly, but you should look at reset location given for NIOS II in your design from where it starts executing program on POR.

[Altera_Forum]

hi, 

this problem has been resolved.   when i try to modify some bytes in one sector/block, the fpga run by mistake, but when i wrote the whole block including the different bytes, it's ok! i don't know why.  when it run by mistake(under modifying the different bytes), i downloaded an sof file into fpga(not epcs) in quartus, and run nios ii, i read the whole block, i found the whole block was filled with "0xFF".