Booting from EPCS to SDRAM with Q-II 5.1

[Altera_Forum]

We have a Cyclone-II FPGA (EP2C35F484C6) with a NIOS system and an EPCS64 Flash, where is the configuration of the FPGA and the programm code. We have the reset address pointing at this EPCS device, and an external SDRAM memory where the boot loader saves the programm to be executed. The problem we have is the FPGA is continually reconfiguring from the EPCS, we don't know exactly why, but we know is related to the SDRAM. If we force the system boots from the EPCS to an Onchip-RAM everything works perfectly!!. 

We think the problem may be also related to the Quartus-II 5.1 (it's the version we are using, with SP1 and SP2).  Thanks!

[Altera_Forum]

Hi jlistan, 

 Does your application work (running in SDRAM) when you use nios2-download? If not, you should check your SDRAM configuration.  Regards, --Scott

[Altera_Forum]

Hello Scott, 

 We know the SDRAM works OK, the problem occurs when the application is saved in SDRAM from the EPCS through the boot loader.  Thanks.

[Altera_Forum]

Do you solve the problem??? 

 I have exactly the same!!!  Everything works fine with JTAG (download from computer to SDRAM) but NIOSII don&#39;t boot when download the code from EPCS ( to SDRAM)  Can you help me???  Thanks a lot!!      --- Quote Start ---  originally posted by jlistan@Jun 8 2006, 04:06 AM hello scott,  we know the sdram works ok, the problem occurs when the application is saved in sdram from the epcs through the boot loader.  thanks. <div align='right'><{post_snapback}> (index.php?act=findpost&pid=16025)  --- quote end ---    --- Quote End ---