/firmware/src/Motherboard/lib_sd/README.txt

 1All code in this directory with minor modifications is from
 2Roland Riegel's excellent SD/MMC card library.  You can find
 3the latest version of the code here:
 4http://www.roland-riegel.de/sd-reader/doc/
 5
 6This particular version is from the 2010-01-10 release.
 7
 8The code here is licensed undel GPLv2 and LGPLv2.1; we're using
 9the latter license, as it is compatible with the GPLv3 (which
10the rest of our codebase is licensed under).