For me, the big take-away here is not that SD cards have firmware that can be reprogrammed, but that there's apparently an opening for a comparatively high performance, cheap Arduino competitor. Being decidedly on the software side of things, I have to admit I was surprised to see that a 100MHz core with loads of memory could be produced for just a few cents now. There are probably dozens of low-cost places where fabrication of such a SoC would be only a minimal departure from churning out flash cards. I'd say let's do exactly that!
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For me, the big take-away here is not that SD cards have firmware that can be reprogrammed, but that there's apparently an opening for a comparatively high performance, cheap Arduino competitor. Being decidedly on the software side of things, I have to admit I was surprised to see that a 100MHz core with loads of memory could be produced for just a few cents now. There are probably dozens of low-cost places where fabrication of such a SoC would be only a minimal departure from churning out flash cards. I'd say let's do exactly that!