Guys, I have two little questions. I have no experience with that kind of "deep" booting related stuff on Linux systems. That are subjects, I alwasys missed somehow So the first question is:
Why should there be at least one FAT partition on the mmc/sd card when booting from it? Ext2 is the boot partition with rootfs, so what's the FAT partition for?
The second interrogation mark in my head is the wear issue. Jffs2 uses wear leveling to harmonize the write cycles throughout the jffs2 partition. So if we have a 512 mb parition, we have to commit about 50tb of traffic (512 * 10^-6*100000) to reach the 100k cycles limit. By the time we reach this amount there should be Nokia Internet Tablet OS 2280, so that's not a problem.
But what about ext2? If we are unlucky, we can wear out some specific blocks in a few months and had to suffer from read errors. Does the SD Controller have error correction? 2bit errors in one word (does not matter that much wich size, imho) are unlikely and 1bit errors can be corrected easily... Hmmm.. just some thoughts on it.