Checking sdram contents after verify error when downloading

Hello,

I have written my own sdram-controller which addresses a sdram with the memory-range from 0x04000000 - 0x04ffffff.

I have an original sdram-controller generated by the NIOS II software which addresses a sdram with the memory-range from 0x02000000 - 0x02ffffff.

Both controllers are connected to the NIOS II processor programmed in the FPGA.

When I run my program in the memory-range from 0x02000000 - 0x02ffffff everything works file.

Simple testing then the sdram with the memory range from 0x04000000 - 0x04ffffff gives no errors.

When I try to run my program in the memory-range from 0x04000000 - 0x04ffffff I got a verifying error when loading it into the sdram.

Is there a way to check what has been loaded into the sdram from memory-locations 0x04000000 - 0x04ffffff.

I tried to use nios2-download but there are no options to read data from sdram-locations. I think it can only download data to sdram.

Does somebody have some idea how I could check the contents of the sdram.

Regards,

WMO