can't boot from epcs to external sram

MSchmitt, you're so smart! Without your hint, I would never find a clue out from the complex asm codes.

Just as what you have said, the default boot loader can't access 16-bits srams.

After I transform my sram to 8-bit width, everything is ok.

Thanks for your rapid help. Well, to help others avoid making the same mistakes that I have made while programing epcs, I'd like to list my mistakes:

1) Forgot assigning AS pins as regular IO, which is necessary for cyclone III.

2) Use JTAG other than AS mode;

3) The problem described in this post.