Finally for those who like to join to great pieces OpenWRT and Routerboard
openwrt trunk - ATTITUDE ADJUSTMENT (bleeding edge, r28279)
download
ftp://ftp.drivehq.com/routerboard/openw … tramfs.elf
setup an tftp/bootp server
linux (as root):
#>
ifconfig eth0 192.168.1.99
dnsmasq -i eth0 --dhcp-range=192.168.1.100,192.168.1.200 \
--dhcp-boot=openwrt-ar71xx-nand-vmlinux-initramfs.elf\
--enable-tftp --tftp-root=/tftp/ -d -u test -p0 -K --log-dhcp --bootp-dynamic
telnet or ssh into the RouterBoard and change to boot once over tftp:
#>
/system routerboard settings set boot-device=try-ethernet-once-then-nand
reboot and load tftp-image
connect the ethernet cable to eth1/wan port
disconnect and reconnect the powercable
wait until the led stops flashing
telnet into ramfs-image
connect the ethernet cable to eth2/lan port (or any other 2-5)
#>
telnet 192.168.1.1
now you can try everything out until you proceed to the next step
flash openwrt on the routerboard
WARNING this will override RouterOS and permanently install OpenWRT
it will also void you warranty and delete all data on the rootfs (it still keeps the bootloader and licences)
(in openwrt)
#>
wget2nand ftp://ftp.drivehq.com/routerboard/openwrt/
install software
(in openwrt)
#>
cd /etc/
rm opkg.conf
wget ftp://ftp.drivehq.com/routerboard/openwrt/opkg.conf (luci is broken in the openwrt-trunk)
opkg update
opkg list (install packages)
opkg install luci (for web-interface if you need it)
opkg install [any other software]
passwd (after it you can use ssh to login)
I testet it on RB450G and it work well 
here is a /etc/config/network configuration with each ports separated
ftp://ftp.drivehq.com/routerboard/openwrt/network it has a vlan2 on eth0 (eth0 is 192.168.1.253)
Q