nios2-flash-programmer failed!

I Desgin a new EP2C8 board with 8MByte flash(S29Gl064N), but it can not download file with nios2-flash-programmer. please help me!!!

it can run Memory Test example and it's OK!

but only nios2-flash-programmer failed!!!

this is output messages:

1. Memory Test

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Memory Test Main Menu

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a: Test RAM

b: Test Flash

e: FlashErase

m: TestFlash(SHOWMAP, CFI)

q: Exit

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Select Choice (a-b): [Followed by <enter>]b

Enter the name of the CFI flash device to be opened,

or just press <enter> to open "/dev/ext_flash"

>/dev/cfi_flash

-Successfully opened /dev/cfi_flash

-Region 0 contains 8 blocks.

-Checking Region 0 for erased blocks.

-Block 1, at address 0x2000 identified.

-Would you like to test this block? (y/n)y

-Starting Flash Test.

-Testing "alt_write_flash" and "alt_read_flash".

pass 1 - passed.

pass 2 - passed.

-Testing "alt_erase_flash_block". passed.

-Testing "alt_write_flash_block". passed.

-Testing unaligned writes. passed.

-Returning block 1 to its erased state.

-Flash tests complete.

-Closing flash device "/dev/cfi_flash".

Press enter to continue...

2. nios2-flash-programmer:# Programming flash with the datafile

"$SOPC_KIT_NIOS2/bin/nios2-flash-programmer" --base=0x00000000 --cable='USB-Blas

ter [USB-0]' --sidp=0x00802010 --id=1524664086 --timestamp=1283755809 --instance

=0 "bit8.flash"

Using cable "USB-Blaster [USB-0]", device 1, instance 0x00

Resetting and pausing target processor: OK

Reading System ID at address 0x00802010: verified

: Checksumming existing contents

00000000 : Reading existing contents

00008000 : Reading existing contents

Checksums took 0.3s

00000000 ( 0%): Erasing

00008000 (50%): Erasing

Erased 16kB in 0.1s

00000000 ( 0%): Programming

Program failed

Leaving target processor paused

please help me!!!