For sure... The SD Memory card works on a RAMPS board. I use PronterFace, but every one of my printers has a RAMPS board. The SD Memory card works in a RAMPS setup with Marlin. I can promise you that! If you can't get it to see a FAT-32 4GB SD card.... Open an issue at GitHub. Somebody that uses SD cards to print will be able to figure out the problem.
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