Looking at Linux source code for SD card drivers. Holy fuck. Hundreds upon hundreds of lines of code that will only ever execute once.
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I wish I could tell you for sure. I reads the SD card's CSD and CID registers, and parses their values into structs, but...
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... how that data is used is beyond me. The source is > 1000 LOC, and 99% of it is just card capability discovery.
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