Hello, today when I restarted the router I've got the same issue described above.
Here is dmesg output for failed boot:
=== IMPORTANT ============================
Use 'passwd' to set your login password
this will disable telnet and enable SSH
------------------------------------------
BusyBox v1.19.4 (2012-09-25 18:39:47 PDT) built-in shell (ash)
Enter 'help' for a list of built-in commands.
_______ ________ __
| |.-----.-----.-----.| | | |.----.| |_
| - || _ | -__| || | | || _|| _|
|_______|| __|_____|__|__||________||__| |____|
|__| W I R E L E S S F R E E D O M
-----------------------------------------------------
ATTITUDE ADJUSTMENT (Bleeding Edge, r33556)
-----------------------------------------------------
* 1/4 oz Vodka Pour all ingredients into mixing
* 1/4 oz Gin tin with ice, strain into glass.
* 1/4 oz Amaretto
* 1/4 oz Triple sec
* 1/4 oz Peach schnapps
* 1/4 oz Sour mix
* 1 splash Cranberry juice
-----------------------------------------------------
root@(none):/# dmesg
[ 0.000000] Linux version 3.3.8 (openwrt@snapon) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #1 Wed Sep 26 04:42:21 PDT 2012
[ 0.000000] MyLoader: sysp=00000000, boardp=00000000, parts=00000000
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU revision is: 00019374 (MIPS 24Kc)
[ 0.000000] SoC: Atheros AR7242 rev 1
[ 0.000000] Clocks: CPU:400.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:5.000MHz
[ 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 8031b100, 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] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: board=TL-WR2543N console=ttyS0,115200 rootfstype=squashfs,jffs2 noinitrd
[ 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 64kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[ 0.000000] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] Memory: 61324k/65536k available (2216k kernel code, 4212k reserved, 581k data, 208k init, 0k highmem)
[ 0.000000] SLUB: Genslabs=9, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:51
[ 0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=1327104)
[ 0.080000] pid_max: default: 32768 minimum: 301
[ 0.080000] Mount-cache hash table entries: 512
[ 0.090000] NET: Registered protocol family 16
[ 0.090000] gpiochip_add: registered GPIOs 0 to 17 on device: ath79
[ 0.100000] MIPS: machine is TP-LINK TL-WR2543N/ND
[ 0.130000] registering PCI controller with io_map_base unset
[ 0.340000] bio: create slab <bio-0> at 0
[ 0.350000] PCI host bridge to bus 0000:00
[ 0.350000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[ 0.360000] pci_bus 0000:00: root bus resource [io 0x0000]
[ 0.360000] pci 0000:00:00.0: [168c:0030] type 0 class 0x000280
[ 0.360000] pci 0000:00:00.0: invalid calibration data
[ 0.370000] pci 0000:00:00.0: reg 10: [mem 0x00000000-0x0001ffff 64bit]
[ 0.370000] pci 0000:00:00.0: reg 30: [mem 0x00000000-0x0000ffff pref]
[ 0.370000] pci 0000:00:00.0: supports D1
[ 0.370000] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[ 0.370000] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1001ffff 64bit]
[ 0.370000] pci 0000:00:00.0: BAR 6: assigned [mem 0x10020000-0x1002ffff pref]
[ 0.380000] pci 0000:00:00.0: using irq 40 for pin 1
[ 0.380000] Switching to clocksource MIPS
[ 0.390000] NET: Registered protocol family 2
[ 0.390000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.400000] TCP established hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.410000] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.410000] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.420000] TCP reno registered
[ 0.420000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.430000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.440000] NET: Registered protocol family 1
[ 0.440000] PCI: CLS 0 bytes, default 32
[ 0.460000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.460000] JFFS2 version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.480000] msgmni has been set to 119
[ 0.480000] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
[ 0.490000] io scheduler noop registered
[ 0.490000] io scheduler deadline registered (default)
[ 0.500000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 0.530000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
[ 0.540000] console [ttyS0] enabled, bootconsole disabled
[ 0.550000] m25p80 spi0.0: found s25sl064a, expected m25p80
[ 0.560000] m25p80 spi0.0: s25sl064a (8192 Kbytes)
[ 0.560000] 5 tp-link partitions found on MTD device spi0.0
[ 0.570000] Creating 5 MTD partitions on "spi0.0":
[ 0.570000] 0x000000000000-0x000000020000 : "u-boot"
[ 0.580000] 0x000000020000-0x00000011d3a4 : "kernel"
[ 0.580000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[ 0.600000] 0x00000011d3a4-0x0000007f0000 : "rootfs"
[ 0.600000] mtd: partition "rootfs" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[ 0.620000] mtd: partition "rootfs" set to be root filesystem
[ 0.620000] mtd: partition "rootfs_data" created automatically, ofs=2A0000, len=550000
[ 0.630000] 0x0000002a0000-0x0000007f0000 : "rootfs_data"
[ 0.640000] 0x0000007f0000-0x000000800000 : "art"
[ 0.640000] 0x000000020000-0x0000007f0000 : "firmware"
[ 0.660000] rtl8367 rtl8367: using GPIO pins 1 (SDA) and 6 (SCK)
[ 0.660000] rtl8367 rtl8367: RTL8367R ver. 0 chip found
[ 2.570000] rtl8367: probed
[ 2.570000] eth0: Atheros AG71xx at 0xb9000000, irq 4
[ 3.130000] TCP cubic registered
[ 3.130000] NET: Registered protocol family 17
[ 3.130000] Bridge firewalling registered
[ 3.140000] 8021q: 802.1Q VLAN Support v1.8
[ 3.150000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[ 3.160000] Freeing unused kernel memory: 208k freed
[ 5.150000] eth0: link up (1000Mbps/Full duplex)
[ 5.480000] Registered led device: tp-link:green:usb
[ 5.480000] Registered led device: tp-link:green:wps