sdram.c:40:4: error: #error If ECC is enabled, Scrubbing should also be enabled.

Description

Due to a problem in the SoC EDS software version 15.0.1 and earlier, this error may be seen when compiling a Software Preloader (SPL) targeting Cyclone® V SOC or Arria® V SOC  for designs with HPS SDRAM ECC enabled in Qsys.
From 15.0.1, the BSP setting SDRAM_SCRUB_REMAIN_REGION  is enabled by default, but SDRAM_SCRUBBING is disabled by default, causing a conflict.

Resolution

To work around this problem, enable SDRAM_SCRUBBING for your SPL BSP in the advanced section of the BSP-Editor GUI

Then:
 1. Re-generate the BSP
 2. Re-compile the SPL: Run make clean and make in your generated SPL directory

See the SoC EDS User Guide for more detail on SDRAM_SCRUB_REMAIN_REGION  and SDRAM_SCRUBBING