That depends. I am assuming that the boot loader flashed into the NAND is some kind of kernel or is it just a loader that loads a kernel located on the flash. If its just a loader and then from there you load a kernel then you could make a small boot area on the flash card that is formatted in JFFS2 and the rest in ext3. I don't have much experience with embedded systems other then my NAS and it has a actual kernel and compressed file system image flashed onto it.
If the kernel is flashed on then it may not even support the ext3 file system.
Last edited by exvor; 11-04-2009 at 10:46 PM.
Reason: Forgot some info