Add MMC support
This is something that I've wanted for a while, to be able to test full size SD and micro SD cards with native readers found in some laptops and tablets.
However, I've found that the probe's results not particularly satisfactory in some cases, irrespective of USB or MMC. I have a 64GB, and 2 1GB micro SD cards that will be detected as bad only using a particular USB/SD adapter. I'm guessing one of them doesn't electrically disconnect the device on reset (?).
MMC probes seem to pass or fail in the same way whether I use the automated MMC tests, or add a wait instead of the bind/unbind to allow physically removing the card from the reader.