FPGA Configuration problem using Flash Memory

Hmm, got another problem.

Now I recompiled pfl2 example, programmed EPM570 device.

Now, in quartus programmer I see both EPM570 and CFI_512MB flash device attached to it.

I can even read it (via examine feature) and it seems looks good.

But I cannot neither write to it, nor erase:

Info: Started Programmer operation at Thu Apr 22 06:45:51 2010
Info: Using default flash programming values
Info: Device 1 CFI Flash 1 is unknown Spansion device (16 bits data bus)
Info: Erasing CFI Flash configuration device(s)
Info: Programming status: erasing flash device 1 (unknown) at device chain position 1
Info: Programming status: erasing flash memory at byte address 0x00000000
Info: Programming status: erasing flash memory at byte address 0x00020000
Error: Erase failure on device number 1
Error: Operation failed
Info: Ended Programmer operation at Thu Apr 22 06:45:59 2010

Where the problem might me? In flash_loader macrofunction?