What I know so far:
- the factory firmware is based on OpenWRT 7.09 (Kamikaze). No idea how heavily it's been modified.
- DD-WRT has a build running on it already here
- OpenWRT's supported devices page didn't list the WNR2000 at all, but the "legacy" page listed the wnr2000v1, which is a sligntly different model.
- The openwrt wiki lists it as being WIP, and There's a forum thread linked, but it's only for the wnr2000v1, with no mention I could find of the v3 in the thread
root@DD-WRT:~# cat /proc/cpuinfo system type : Atheros AR7241 rev 1.1 (0x0101) processor : 0 cpu model : MIPS 24Kc V7.4 BogoMIPS : 239.61 CPUClock : 360 wait instruction : yes microsecond timers : yes tlb_entries : 16 extra interrupt vector : yes hardware watchpoint : yes, count: 4, address/irw mask: [0x0000, 0x0ff8, 0x0ff8, 0x0ff8] ASEs implemented : mips16 shadow register sets : 1 kscratch registers : 0 core : 0 VCED exceptions : not available VCEI exceptions : not available root@DD-WRT:~# lsmod Module Size Used by xt_opendpi 134384 0 nf_nat_pptp 1360 0 nf_conntrack_pptp 3152 1 nf_nat_pptp nf_nat_proto_gre 848 1 nf_nat_pptp nf_conntrack_proto_gre 2304 1 nf_conntrack_pptp ath9k 96624 0 ath9k_common 1232 1 ath9k ath9k_hw 347648 2 ath9k,ath9k_common ath 11888 3 ath9k,ath9k_common,ath9k_hw mac80211 187584 1 ath9k cfg80211 131040 2 ath9k,mac80211 compat 1424 0 ag7240_mod 27456 0
Just a heads up that there are working images of OpenWRT for this device now.