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So for us, if we build in SDRAM ECC unconditionally, there is a >> requirement with the bootloader to turn on ECC and scrub the memory. > > Huh, how does a built-in piece of code cause the bootloader to do > something?!? > > And how would the bootloader know what's in the kernel? The bootloader > runs first and hands off to the kernel... > Hi Boris, The decision about ECC or non-ECC SDRAM is made before building the Linux image and must be matched to the appropriate bootloader (ECC or non-ECC). If ECC is desired for SDRAM, the bootloader enables SDRAM ECC and then initializes the memory contents (scrub) before the Linux image is loaded into SDRAM. The ECC syndromes are calculated and stored in SDRAM only when SDRAM ECC is enabled and the SDRAM data is written (in the bootloader case, this is the Linux image). If we suddenly switched ECC on during Linux initialization, we'd be flooded with ECC errors since the ECC syndromes won't match the data for the Linux image. The scrubbing process takes more time to boot which some of our customers don't want. This is what Dinh was referring to.