I think you have 8Mb of flash and my router only 4Mb (WRT54GL).
root@OpenWrt:/jffs/usr/bin# df -h
Filesystem Size Used Available Use% Mounted on
rootfs 2.1M 2.1M 0 100% /
/dev/root 2.1M 2.1M 0 100% /rom
tmpfs 7.0M 60.0k 6.9M 1% /tmp
/dev/mtdblock/4 1.2M 1.1M 92.0k 92% /jffs
mini_fo:/jffs 2.1M 2.1M 0 100% /
I´ve to read and search in internet all the info you post here... 
I´ll keep you updated.
Thank-u!!
Igor R.