http://openhardware.net/Embedded_ARM/RDCF2/

MSDOS FAT16 filesystem layer.

Small footprint: newlib + rdcf2 is 23K (optimized Thumb).

Supports subdirectories.

Create files up to 2Gig in size. Supports SD/MMC cards up to 2Gig

Supports fopen() modes: r,r+,w,w+,a,a+

Random file I/O with fseek() when files opened with: r+,w+ and a+ modes

These are the times to delete a 512K file, then write a new 512K file: SanDisk 1Gig capacity: 4 seconds

Changelog
http://openhardware.net/Embedded_ARM/RDCF2/files/Changelog

Вот что ответил автор по поводу статуса
Код
>>Is RDCF2 live project? Releases 1.1-1.7 was done in November 2005, and after this time nothing was released.

TW> Yes, it is.  I have two designs running it and  a third in the design
TW> stage now.  As for updates, the original author did a real nice job
TW> coding it, so, if it isn't broke, don't fix it? ;-)
Вероятно, ее можно рассматривать как альтернативу EFSL
http://sourceforge.net/projects/efsl/
http://www.efsl.be/

Вообще, http://openhardware.net - достаточно интересный сайт. Побродите - не пожалеете.