But why can't you use the SD card for swapping already? The whole point of that flash translation layer in the SD card is so Linux wouldn't need special code like this. Doesn't the SD card look to Linux like a disk drive?
I would be afraid to swap to an SD card because of the wear. These products are sold for things like storing photographs -- applications where a heavy user would be unlikely to write to the same block even twice in a day. Swapping would probably wear one out pretty quickly, with a pretty nasty failure mode.
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