Doblecero, gracias, he empezado de nuevo cargando la imagen de openwrt, instalado el paquete para el usb wifi kmod-rtl8187. La wifi seria para conectar con la wifi de casa en modo cliente. He seguido tus indicaciones y te pongo lo que ha devuelto.
wifi
wlan0: link is not ready
ifconfig
br-lan Link encap:Ethernet HWaddr 53:7Z:4A:03:92:ED
inet addr:192.168.69.250 Bcast:192.168.69.255 Mask:255.255.255.0
inet6 addr: fe80::527e:5dff:fe03:46ed/64 Scope:Link
inet6 addr: fd02:f75d:ed29::1/60 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1314 errors:0 dropped:0 overruns:0 frame:0
TX packets:1513 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:135646 (132.4 KiB) TX bytes:368962 (360.3 KiB)
eth0 Link encap:Ethernet HWaddr FF:5E:AA:B4:BB:29
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1380 errors:0 dropped:0 overruns:0 frame:0
TX packets:1513 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:171268 (167.2 KiB) TX bytes:383847 (374.8 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:522 errors:0 dropped:0 overruns:0 frame:0
TX packets:522 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:46537 (45.4 KiB) TX bytes:46537 (45.4 KiB)
nas0 Link encap:Ethernet HWaddr 53:7Z:4A:03:92:ED
inet6 addr: fe80::527e:5dff:fe03:46ee/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:187 dropped:0 overruns:0 carrier:187
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
dmesg (he cogido solo una parte es muy largo)
[ 87.960000] WARNING: at /home/lesgar/Documents/Arv7519Pruebas/openwrt/build_dir/target-mips_34kc+dsp_uClibc-0.9.33.2/linux-lantiq_xrx200/compat-wireless-2014-03-31/net/mac80211/rx.c:3378 mac80211_ieee80211_rx+0x190/0x890 [mac80211]()
[ 87.980000] Modules linked in: iptable_nat rtl8187 pppoe p54usb p54common nf_ nat_ipv4 nf_conntrack_ipv4 mac80211 ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_tcpmss xt_string xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY usblp ums_usbat ums_sddr55 ums_sddr09 ums_karma ums_jumpshot ums_isd200 ums_freecom ums_datafab ums_cypress ums_alauda ts_kmp ts_fsm ts_bm pppox ppp_async nf_nat_irc nf_nat_ftp nf_nat nf_defrag_ipv4 nf_conntrack_irc nf_conntrack_ftp ltq_deu_vr9 iptable_raw iptable_mangle iptable_filter ipt_REJECT ipt_ ECN ip_tables crc_ccitt compat cdc_wdm fuse act_connmark act_skbedit act_mirred em_u32 cls_u32 cls_tcindex cls_flow cls_route cls_fw sch_hfsc sch_ingress sg drv_dsl_cpe_api drv_mei_cpe ip6t_REJECT ip6t_rt ip6t_hbh ip6t_mh ip6t_ipv6header ip6t_frag ip6t_eui64 ip6t_ah ip6table_raw ip6table_mangle ip6table_filter ip6_tables x_tables nf_conntrack_ipv6 nf_conntrack nf_defrag_ipv6 pppoatm ppp_generic slhc nfsv3 nfs msdos ifb vfat fat lockd sunrpc hfsplus hfs br2684 atm bcma nls_utf8 nls_iso8859_1 ipv6 eeprom_93cx6 drv_ifxos arc4 crypto_blkcipher usb_storage ltq_hcd_vr9 uhci_hcd sd_mod scsi_mod gpio_button_hotplug ext4 jbd2 mbcache ssb
[ 88.096000] CPU: 0 PID: 1158 Comm: uhttpd Tainted: G W 3.10.36 #7
[ 88.104000] Stack : 00000000 00000000 00000000 00000000 804232ea 0000003f 86c 45340 86cce260
[ 88.104000] 80367c7c 803d723b 00000486 80422a98 86c45340 86cce260 878acc0c 00000009
[ 88.104000] 80440000 80023b14 00000003 800213cc 00000000 00000000 80369f84 86d15b84
[ 88.104000] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 88.104000] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 86d15b10
[ 88.104000] ...
[ 88.140000] Call Trace:
[ 88.144000] [<800166d0>] show_stack+0x48/0x70
[ 88.148000] [<80021540>] warn_slowpath_common+0x78/0xa8
[ 88.152000] [<800215f8>] warn_slowpath_null+0x18/0x24
[ 88.156000] [<86ca25b4>] mac80211_ieee80211_rx+0x190/0x890 [mac80211]
[ 88.164000] [<86c800e0>] ieee80211_restart_hw+0xe0/0x1d4 [mac80211]
[ 88.168000]
[ 88.172000] ---[ end trace d3d51ab28d3e830f ]---
[ 88.192000] usb 1-1: USB disconnect, device number 2
[ 136.356000] usb 1-1: new high-speed USB device number 3 using ifxusb_hcd
[ 137.008000] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[ 137.016000] ieee80211 phy1: hwaddr 00:0a:eb:00:51:2d, RTL8187vB (default) V1 + rtl8225z2, rfkill mask 2
[ 137.060000] rtl8187: Customer ID is 0xFF
[ 137.072000] rtl8187: wireless switch is on
/etc/config/wireless
config wifi-device 'radio0'
option type 'mac80211'
option channel '11'
option hwmode '11g'
option path 'platform/ifxusb_hcd/usb1/1-1/1-1:1.0'
option txpower '20'
option country '00'
config wifi-iface
option device 'radio0'
option network 'lan'
option ssid 'OpenWrt'
option encryption 'none'
option mode 'sta'
perdona pero en esto novato total, gracias