non-cacheable instruction memory

Thank you for the answer, but now I have another problem. When I map the .text section into tightly coupled memory and I debug an assembler code on hardware the Nios II IDE gives this error:

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Downloading 02100020 ( 0%)

Downloading 04000000 ( 1%)

Downloading 06000000 (21%)

Downloaded 39KB in 0.6s (65.0KB/s)

Verifying 02100020 ( 0%)

Verifying 04000000 ( 1%)

Verifying 06000000 (21%)

Verify failed between address 0x6000000 and 0x6007923

Leaving target processor paused

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0x6000000 is the starting address of the tightly coupled memory.

What does it mean???

How can I solve it???

Thank you.

Rolfo Daniele.