Error: Erase failed at offset 0,

[Altera_Forum]

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

Info: Resetting and pausing target processor: OK Info: Reading System ID at address 0x00001828: verified Info: Info: : Checksumming existing contents Info: Info: 00000000 : Verifying existing contents Info: Info: 00000000 : Reading existing contents Info: Info: Checksummed/read 25kB in 10.1s Info: Info: 00000000 ( 0%): Erasing Info: Info: Erase failed at offset 0 Info: Leaving target processor paused Error: Error code: 255 for command: bin/nios2-flash-programmer "E:/Verilog/LCM2/flash/LCM2_epcs.flash" --base=0x0 --epcs --sidp=0x1828 --id=0x0 --timestamp=1294660218 --device=1 --instance=0 '--cable=USB-Blaster on localhost [USB-0]' --program   I tested USB-Blaster and byte Blaster,and changed EPCS4 and EPCS16.It's the same error.I googled ,no anwser. who can help me this problem, thank you!  ps: run as H/W is OK.it's happened at download .elf file

[Altera_Forum]

are you sure that the EPCS controller is at address 0x0 in your SOPC system?

[Altera_Forum]

--- Quote Start ---  are you sure that the EPCS controller is at address 0x0 in your SOPC system?  --- Quote End ---     Yes，EPCS address is locked at 0x0.And the reset is epcs,exception is SDRAM.

[Altera_Forum]

what FPGA are you using? If it can use a serial flash loader (SFL) design, then you could access the flash from the Quartus programmer without going through a NIOS system. That way you should be able to test the EPCS flash and know if the problem comes from the EPCS itself (or the connection between the EPCS and the FPGA) or from the NIOS/SOPC component.

[Altera_Forum]

--- Quote Start ---  what FPGA are you using? If it can use a serial flash loader (SFL) design, then you could access the flash from the Quartus programmer without going through a NIOS system. That way you should be able to test the EPCS flash and know if the problem comes from the EPCS itself (or the connection between the EPCS and the FPGA) or from the NIOS/SOPC component.  --- Quote End ---    Thanks for your help. I solved the problem by changing the S/W version.Now it's working Ok. Maybe, 10.1 is unsteadable. Now I using version 9.0.My FPGA is EP2C5Q208.

[Altera_Forum]

--- Quote Start ---  what FPGA are you using? If it can use a serial flash loader (SFL) design, then you could access the flash from the Quartus programmer without going through a NIOS system. That way you should be able to test the EPCS flash and know if the problem comes from the EPCS itself (or the connection between the EPCS and the FPGA) or from the NIOS/SOPC component.  --- Quote End ---    Hi,  I am having the same problem.  My objective: To build a customized boot loader. For that I am folowing "An-458 Alternative nios II boot methods". I am using advanced boot loader example where my boot loader stays in CFI and after reset tries to copy the boot record into onchip SRAM (small helloworld program provided with the AN).   System contents (slightly customized to avoid OpenCorePlus license): nios2 processos -> Reset Vector -> ext_flash (base = 0x0, offset = 0x0)  -> exception vector -> sram (offset = 0x0)  Board : Cyclone III Dev, ep3c120 Altera : tried with both 9.1sp1 and 11.1sp2  error: (boot image) bash-3.1$ nios2-flash-programmer --base=0x0 hello_world.flash --debug Using cable "USB-Blaster [USB-0]", device 1, instance 0x00 Resetting and pausing target processor: OK Found CFI table in 16 bit mode Raw CFI query table read from device:  0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  20: 51 00 52 00 59 00 02 00 00 00 40 00 00 00 00 00 Q.R.Y.....@.....  30: 00 00 00 00 00 00 27 00 36 00 00 00 00 00 07 00 ......'.6.......  40: 07 00 0A 00 00 00 03 00 05 00 04 00 00 00 1A 00 ................ CFI query table read from device:  10: 51 52 59 02 00 40 00 00 00 00 00 27 36 00 00 07 QRY..@.....'6...  20: 07 0A 00 03 05 04 00 1A 02 00 05 00 01 FF 01 00 ................  30: 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ CFI extended table read from device:  0: 50 52 49 31 33 10 02 01 00 08 00 00 02 B5 C5 05 PRI13...........  10: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Device size is 64MByte Erase regions are:  offset 0: 512 x 128K Device supports AMD style programming algorithm Multi-byte programming with 32 byte buffer Sector erase timeout is 16s Word program timeout is 1ms Buffer program timeout is 4ms  : Checksumming existing contents 00240000 : Checksum failed - needs erase then program 00240000 : Reading existing contents Checksummed/read 103kB in 2.5s 00240000 ( 0%): Erasing Erased 128kB in 0.0s 00240000 ( 0%): Programming Program failed Leaving target processor paused   error: (boot loader) bash-3.1$ nios2-flash-programmer --base=0x0 ext_flash.flash --debug Using cable "USB-Blaster [USB-0]", device 1, instance 0x00 Resetting and pausing target processor: OK Found CFI table in 16 bit mode Raw CFI query table read from device:  0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  20: 51 00 52 00 59 00 02 00 00 00 40 00 00 00 00 00 Q.R.Y.....@.....  30: 00 00 00 00 00 00 27 00 36 00 00 00 00 00 07 00 ......'.6.......  40: 07 00 0A 00 00 00 03 00 05 00 04 00 00 00 1A 00 ................ CFI query table read from device:  10: 51 52 59 02 00 40 00 00 00 00 00 27 36 00 00 07 QRY..@.....'6...  20: 07 0A 00 03 05 04 00 1A 02 00 05 00 01 FF 01 00 ................  30: 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ CFI extended table read from device:  0: 50 52 49 31 33 10 02 01 00 08 00 00 02 B5 C5 05 PRI13...........  10: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................  30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Device size is 64MByte Erase regions are:  offset 0: 512 x 128K Device supports AMD style programming algorithm Multi-byte programming with 32 byte buffer Sector erase timeout is 16s Word program timeout is 1ms Buffer program timeout is 4ms  : Checksumming existing contents 00000000 : Checksum failed - needs erase then program 00000000 : Reading existing contents Checksummed/read 126kB in 3.0s 00000000 ( 0%): Erasing Erase failed at offset 0 Leaving target processor paused  I tried to use a stand alone "nios2-flash-programmer-gui" to convert some already IDE working program (reset vector in ext_flash) from ELF to FLASH. And tried to write flash. However, result was the same.  Any help, suggestion, links will be very helpful to me.  Thank you very much.