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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Turning one mess into another? Strange because what you actually need to read/write isn't that much.
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But my use is very specific and we know the cards so I'm probably just ignorant. Maybe there are some quirks to work around?
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I'm focusing on just SDC cards right now; eventually I want to support SDHC and SDXC as well. But, still, 1KLOC?!
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Linux drivers overall are not good examples of properly factored code.
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I'm pretty convinced Linux drivers are a complete mess. I don't know how anyone can work with them at all.