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I'm trying to temporarily use my MiSTer system for a non-gaming purpose and I need to run a Linux binary that's on a second SD card attached with a USB reader, but I'm getting an Exec format error. Anything I can try?
You need to rebuild your binary for the MiSTer. "Exec format error" is to say that your machine cannot interpret the binary in the file as CPU instructions; Ensure that you get an ARM binary and not an x86 one if it was pre-compiled.
If it is a shell script, ensure that the header is included.