What's the problem of flash

[Altera_Forum]

hi,everyone. 

I confront the problem that: the flash can work sometimes.   The flash is AM29LV641DH-90   When I use flashprogrammer flashdown elf,it can flash down sometimes like :    --------------------------------# ! /bin/sh# # This file was automatically generated by the Nios II IDE Flash Programmer.# # It will be overwritten when the flash programmer options change.#   cd I:/WOEPCS/hello_world_0/Debug # Creating .flash file for the FPGA configuration $SOPC_KIT_NIOS2/bin/sof2flash --epcs --input=I:/WOEPCS/WOEPCS.sof --output=WOEPC S.flash Info: ******************************************************************* Info: Running Quartus II Convert_programming_file Info: Command: quartus_cpf --no_banner --convert --device=EPCS64 --option=WOEPCS .opt I:/WOEPCS/WOEPCS.sof WOEPCS.pof Info: Quartus II Convert_programming_file was successful. 0 errors, 0 warnings  Info: Processing ended: Mon Oct 23 19:40:15 2006  Info: Elapsed time: 00:00:02 Info: ******************************************************************* Info: Running Quartus II Convert_programming_file Info: Command: quartus_cpf --no_banner --convert WOEPCS.pof WOEPCS.rpd Info: Quartus II Convert_programming_file was successful. 0 errors, 0 warnings  Info: Processing ended: Mon Oct 23 19:40:17 2006  Info: Elapsed time: 00:00:01 # Programming flash with the FPGA configuration $SOPC_KIT_NIOS2/bin/nios2-flash-programmer --cable='ByteBlasterMV [LPT1]' --devi ce=1 --epcs --base=0x00000000 WOEPCS.flash Using cable "ByteBlasterMV [LPT1]", device 1, instance 0x00 Resetting and pausing target processor: OK   : Checksumming existing contents   00000000 : Verifying existing contents   00008000 : Verifying existing contents   00010000 : Verifying existing contents   00000000 : Reading existing contents   00008000 : Reading existing contents   00010000 : Reading existing contents   Checksummed/read 96kB in 6.6s   00000000 ( 0%): Erasing   00008000 (33%): Erasing   00010000 (66%): Erasing   Erased 96kB in 2.8s (34.2kB/s)   00000000 ( 0%): Programming   00008000 (33%): Programming   00010000 (66%): Programming   Programmed 76KB +20KB in 3.9s (24.6KB/s)  Did not attempt to verify device contents Leaving target processor paused # Creating .flash file for the project $SOPC_KIT_NIOS2/bin/elf2flash --base=0x00800000 --end=0xbfffff --reset=0x0 --inp ut=hello_world_0.elf --output=cfi_flash_0.flash --boot=$SOPC_KIT_NIOS2/component s/altera_nios2/boot_loader_cfi.srec # Programming flash with the project $SOPC_KIT_NIOS2/bin/nios2-flash-programmer --cable='ByteBlasterMV [LPT1]' --devi ce=1 --base=0x00800000 cfi_flash_0.flash Using cable "ByteBlasterMV [LPT1]", device 1, instance 0x00 Resetting and pausing target processor: OK   : Checksumming existing contents   00000000 : Reading existing contents   Checksummed/read 16kB in 1.1s   00000000 ( 0%): Erasing   Erased 64kB in 0.3s (213.3kB/s)   00000000 ( 0%): Programming   Programmed 49KB +15KB in 3.5s (18.2KB/s)  Device contents checksummed OK Leaving target processor paused   --------------------------------------------------------  But sometimes(and almost) ,it appear like this:    NO CFI Table found at 0x800000    ---------------------------------------------------- The step I create my board description is that:I use protel 2004 to generate wirelist formate file.then In the SOPC new description,.........  How can I know whether the flash is OK or NOT.Is flash easy to broke.  Could anyone give me some advice to findout where is wrong.Thanks. Best wishes!