Como ya te he dicho, lo he flasheado desde el bootloader (apagando el router y dejando pulsado reset durante 20 segundos al encenderlo).
Bueno pues ya que tienes identificado el problema, solo me queda esperar la próxima compilación.
Gracias por todo 
Pásame el bootlog de este firmware porfa:
https://dl.dropbox.com/u/4708147/openwrt/hw556/openwrt-HW556-squashfs-cfe_r32741.bin
Saludos.
Ahí lo tienes:
[spoiler=dmesg]
[ 0.000000] Linux version 3.3.8 (noltari@skynet) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #2 Mon Jul 16 16:01:25 CEST 2012
[ 0.000000] Detected Broadcom 0x6358 CPU revision a1
[ 0.000000] CPU frequency is 300 MHz
[ 0.000000] 64MB of RAM installed
[ 0.000000] registering 40 GPIOs
[ 0.000000] gpiochip_add: registered GPIOs 0 to 39 on device: bcm63xx-gpio
[ 0.000000] board_bcm963xx: Boot address 0xbe000000
[ 0.000000] board_bcm963xx: CFE version: 100.48.56-49.46
[ 0.000000] HW556: Unable to detect board model 0x4c06f. Protecting last 2MB of flash to avoid erasing wlan cal_data.
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU revision is: 0002a010 (Broadcom BMIPS4350)
[ 0.000000] board_bcm963xx: board name: HW556
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 04000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Zone PFN ranges:
[ 0.000000] Normal 0x00000000 -> 0x00004000
[ 0.000000] Movable zone start PFN for each node
[ 0.000000] Early memory PFN ranges
[ 0.000000] 0: 0x00000000 -> 0x00004000
[ 0.000000] On node 0 totalpages: 16384
[ 0.000000] free_area_init_node: node 0, pgdat 8029f750, node_mem_map 81000000
[ 0.000000] Normal zone: 128 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 16256 pages, LIFO batch:3
[ 0.000000] Reserving 0MB of memory at 0MB for crashkernel
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc:
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: root=/dev/mtdblock2 rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Primary instruction cache 16kB, VIPT, 2-way, linesize 16 bytes.
[ 0.000000] Primary data cache 16kB, 2-way, VIPT, cache aliases, linesize 16 bytes
[ 0.000000] Memory: 61896k/65536k available (2225k kernel code, 3640k reserved, 398k data, 196k init, 0k highmem)
[ 0.000000] NR_IRQS:128
[ 0.000000] Calibrating delay loop... 299.26 BogoMIPS (lpj=598528)
[ 0.036000] pid_max: default: 32768 minimum: 301
[ 0.040000] Mount-cache hash table entries: 512
[ 0.052000] NET: Registered protocol family 16
[ 0.068000] registering PCI controller with io_map_base unset
[ 0.088000] bio: create slab <bio-0> at 0
[ 0.096000] PCI host bridge to bus 0000:00
[ 0.100000] pci_bus 0000:00: root bus resource [mem 0x30000000-0x37ffffff]
[ 0.104000] pci_bus 0000:00: root bus resource [io 0x8000000-0x800ffff]
[ 0.108000] pci 0000:00:01.0: [1814:3592] type 0 class 0x000280
[ 0.108000] pci 0000:00:01.0: reg 10: [mem 0xffff0000-0xffffffff]
[ 0.120000] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
[ 0.120000] pci 0000:00:01.0: BAR 0: assigned [mem 0x30000000-0x3000ffff]
[ 0.124000] Switching to clocksource MIPS
[ 0.136000] NET: Registered protocol family 2
[ 0.140000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.148000] TCP established hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.156000] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.164000] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.172000] TCP reno registered
[ 0.172000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.180000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.188000] NET: Registered protocol family 1
[ 0.192000] PCI: CLS 0 bytes, default 16
[ 0.196000] audit: initializing netlink socket (disabled)
[ 0.200000] type=2000 audit(0.200:1): initialized
[ 0.208000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.216000] JFFS2 version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.224000] msgmni has been set to 120
[ 0.228000] io scheduler noop registered
[ 0.232000] io scheduler deadline registered (default)
[ 0.240000] bcm63xx_uart.0: ttyS0 at MMIO 0xfffe0100 (irq = 10) is a bcm63xx_uart
[ 0.248000] console [ttyS0] enabled, bootconsole disabled
[ 0.268000] physmap platform flash device: 02000000 at 1e000000
[ 0.272000] physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x0000c2 Chip ID 0x00227e
[ 0.284000] physmap-flash.0: Found an alias at 0x1000000 for the chip at 0x0
[ 0.284000] Amd/Fujitsu Extended Query Table at 0x0040
[ 0.288000] Amd/Fujitsu Extended Query version 1.3.
[ 0.296000] number of CFI chips: 1
[ 0.300000] bcm63xxpart: CFE boot tag found with version 8 and board type HW556
[ 0.308000] bcm63xxpart: Partition 0 is CFE offset 0 and length 20000
[ 0.312000] bcm63xxpart: Partition 1 is kernel offset 20100 and length fff00
[ 0.320000] bcm63xxpart: Partition 2 is rootfs offset 120000 and length ce0000
[ 0.328000] bcm63xxpart: Partition 3 is cal_data offset e00000 and length 20000
[ 0.336000] bcm63xxpart: Partition 4 is nvram offset fe0000 and length 20000
[ 0.344000] bcm63xxpart: Partition 5 is linux offset 20000 and length de0000
[ 0.348000] bcm63xxpart: Spare partition is offset 340004 and length abfffc
[ 0.356000] 6 bcm63xxpart partitions found on MTD device physmap-flash.0
[ 0.364000] Creating 6 MTD partitions on "physmap-flash.0":
[ 0.368000] 0x000000000000-0x000000020000 : "CFE"
[ 0.380000] 0x000000020100-0x000000120000 : "kernel"
[ 0.384000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[ 0.400000] 0x000000120000-0x000000e00000 : "rootfs"
[ 0.408000] mtd: partition "rootfs" set to be root filesystem
[ 0.416000] mtd: partition "rootfs_data" created automatically, ofs=340000, len=AC0000
[ 0.424000] 0x000000340000-0x000000e00000 : "rootfs_data"
[ 0.432000] 0x000000e00000-0x000000e20000 : "cal_data"
[ 0.444000] 0x000000fe0000-0x000001000000 : "nvram"
[ 0.452000] 0x000000020000-0x000000e00000 : "linux"
[ 0.472000] bcm63xx-wdt bcm63xx-wdt: started, timer margin: 30 sec
[ 0.480000] Registered led device: HW556:red:message
[ 0.480000] Registered led device: HW556:red:hspa
[ 0.480000] Registered led device: HW556:red:dsl
[ 0.484000] Registered led device: HW556:red:power
[ 0.484000] Registered led device: HW556:red:all
[ 0.484000] TCP cubic registered
[ 0.488000] NET: Registered protocol family 17
[ 0.492000] 8021q: 802.1Q VLAN Support v1.8
[ 0.504000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[ 0.516000] Freeing unused kernel memory: 196k freed
[ 3.232000] eth0: link forced UP - 100/full - flow control off/off
[ 3.452000] roboswitch: Probing device eth0: found a 5325! It's a 5350.
[ 4.516000] There is already a switch registered on the device 'eth0'
[ 5.984000] Button Hotplug driver version 0.4.1
[ 12.828000] Compat-wireless backport release: compat-wireless-2012-07-03-2-3-g7adf66e
[ 12.836000] Backport based on wireless-testing.git master-2012-07-06
[ 12.844000] compat.git: wireless-testing.git
[ 12.908000] cfg80211: Calling CRDA to update world regulatory domain
[ 12.912000] cfg80211: World regulatory domain updated:
[ 12.920000] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 12.928000] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 12.936000] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 12.944000] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 12.952000] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 12.960000] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 13.408000] NET: Registered protocol family 10
[ 13.860000] SCSI subsystem initialized
[ 13.952000] There is already a switch registered on the device 'eth0'
[ 14.312000] usbcore: registered new interface driver usbfs
[ 14.316000] usbcore: registered new interface driver hub
[ 14.324000] usbcore: registered new device driver usb
[ 15.472000] PCI: Enabling device 0000:00:01.0 (0000 -> 0002)
[ 15.480000] rt2800pci 0000:00:01.0: setting latency timer to 64
[ 15.496000] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[ 15.500000] Registered led device: rt2800pci-phy0::radio
[ 15.500000] Registered led device: rt2800pci-phy0::assoc
[ 15.500000] Registered led device: rt2800pci-phy0::quality
[ 15.848000] PPP generic driver version 2.4.2
[ 16.236000] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 16.528000] NET: Registered protocol family 24
[ 16.728000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 16.836000] bcm63xx_ehci bcm63xx_ehci.0: BCM63XX integrated EHCI controller
[ 16.840000] bcm63xx_ehci bcm63xx_ehci.0: new USB bus registered, assigned bus number 1
[ 16.876000] bcm63xx_ehci bcm63xx_ehci.0: irq 18, io mem 0xfffe1300
[ 16.892000] bcm63xx_ehci bcm63xx_ehci.0: USB 2.0 started, EHCI 1.00, overcurrent ignored
[ 16.900000] hub 1-0:1.0: USB hub found
[ 16.904000] hub 1-0:1.0: 2 ports detected
[ 17.084000] nf_conntrack version 0.5.0 (970 buckets, 3880 max)
[ 17.880000] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 18.300000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 18.408000] bcm63xx_ohci bcm63xx_ohci.0: BCM63XX integrated OHCI controller
[ 18.412000] bcm63xx_ohci bcm63xx_ohci.0: new USB bus registered, assigned bus number 2
[ 18.420000] bcm63xx_ohci bcm63xx_ohci.0: irq 13, io mem 0xfffe1400
[ 18.488000] hub 2-0:1.0: USB hub found
[ 18.492000] hub 2-0:1.0: 1 port detected
[ 18.668000] Initializing USB Mass Storage driver...
[ 18.672000] usbcore: registered new interface driver usb-storage
[ 18.680000] USB Mass Storage support registered.
[ 18.716000] usbcore: registered new interface driver ums-alauda
[ 18.752000] usbcore: registered new interface driver ums-cypress
[ 18.792000] usbcore: registered new interface driver ums-datafab
[ 18.828000] usbcore: registered new interface driver ums-freecom
[ 18.864000] usbcore: registered new interface driver ums-isd200
[ 18.900000] usbcore: registered new interface driver ums-jumpshot
[ 18.940000] usbcore: registered new interface driver ums-karma
[ 18.976000] usbcore: registered new interface driver ums-sddr09
[ 19.012000] usbcore: registered new interface driver ums-sddr55
[ 19.052000] usbcore: registered new interface driver ums-usbat
[ 19.088000] input: gpio-keys-polled as /devices/platform/gpio-keys-polled.0/input/input0
[ 26.380000] eth0: link forced UP - 100/full - flow control off/off
[ 26.392000] device eth0 entered promiscuous mode
[ 26.400000] br-lan: port 1(eth0) entered forwarding state
[ 26.404000] br-lan: port 1(eth0) entered forwarding state
[ 28.408000] br-lan: port 1(eth0) entered forwarding state
[ 47.520000] jffs2_scan_eraseblock(): End of filesystem marker found at 0x0
[ 47.528000] jffs2_build_filesystem(): unlocking the mtd device... done.
[ 47.532000] jffs2_build_filesystem(): erasing all blocks after the end marker... done.
[ 109.468000] JFFS2 notice: (1074) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[/spoiler]