1.) I'm not done yet, the filesystem mounts and LZMA blocks are
decompressed seemingly ok, but I have a kernel fault to track down.
Shouldn't be a problem, but I'm over it for today.
2.) I sent wbx patches to go ahead and apply, suggesting adding "-X
lzma" to the mkfs.jffs2 command line so that it excludes the LZMA
encoder and (I assume) prevents the above forementioned kernel fault.
3.) I suggested going ahead and applying these because I'm sick of
patches and I noticed you guys are rapidly changing the build
environment. If one of the affected source files changes, I might get
suicidal.
4.) Here's a sample difference in size:

before: 2098176  (FreeWrt default - WRT54G JFFS2)
lzma   :  1901568  (FreeWrt default - WRT54G JFFS2)

So, as I said before, around 10%... a big improvement.

If anyone else wants these patches, here you go:

http://www.bitsum.com/files/patches/jffs2_lzma_patch.tar.gz

--
Jeremy Collake (db90h)
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