Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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Kernel is still outdated (I guess its for 1.00 firmware)
I don't care about ralink part because Its not hard to get rt2500 from rt2x00.serialmonkey.com working. But new Kernel source could be good to have to fix some bugs in "custom firmware".
Although Gentoo and Debian booted from hard disk will work just OK with this old version, so personally I don't complain much.
http://dsmg600.info/howto:chroot_gentoo … o_boot_log
Only RTC part is messed up and clock will go down about 30 minutes in 24h. But its easy to fix with ntp-client.