Workaround for OLPC trac 4184 - Increase the size of the JFFS2 dirent buffer, shrink the footprint of entries in that buffer, and do not store dirents that obsolete the immediately-preceding one, all with the goal of surviving "millions of dirents" JFFS2 filesystem pathologies.
cpu/x86/pc/olpc/addrs.fth
ofw/fs/jffs2/jffs2.fth