自定制openwrt启动提示no TP-Link header found

最近在定制openwrt时，发现一个奇怪的问题，自己一直的openwrt提示，升级之后，提示spi0.0: no TP-Link header found，由于以前没有研究过openwrt，

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*   U-Boot 1.1.4  (Sep 30 2015, 16:19:33)   *
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QXNET E600G (QCA953x) U-Boot

DRAM:   16bit ddr2
64 MB SDRAM
FLASH:  Winbond W25Q128 (16 MB)
LED on during eth initialization...

eth0 up
eth1 up

Hit any key to stop autoboot: 0

Booting image at: 0x9F040000

Image name:   OpenWrt r48549
Image type:   MIPS Linux Kernel Image (lzma compressed)
Data size:    1057092 Bytes = 1 MB
Load address: 0x80060000
Entry point:  0x80060000

Uncompressing kernel image... OK!
Starting kernel...

[    0.000000] Linux version 3.10.49 (linux@linux-virtual-machine) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r48549) ) #2 Fri Apr 29 08:55:54 CST 2016
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU revision is: 00019374 (MIPS 24Kc)
[    0.000000] SoC: Qualcomm Atheros QCA9533 rev 2
[    0.000000] Clocks: CPU:650.000MHz, DDR:390.771MHz, AHB:216.666MHz, Ref:25.000MHz
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 04000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x00000000-0x03ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x00000000-0x03ffffff]
[    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] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
[    0.000000] Kernel command line:  board=E600G 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] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 61272k/65536k available (2239k kernel code, 4264k reserved, 603k data, 228k init, 0k highmem)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Calibrating delay loop... 432.53 BogoMIPS (lpj=2162688)
[    0.050000] pid_max: default: 32768 minimum: 301
[    0.050000] Mount-cache hash table entries: 512
[    0.060000] NET: Registered protocol family 16
[    0.070000] MIPS: machine is E600G
[    0.080000] ar724x-pci ar724x-pci.0: PCIe link is down
[    0.080000] registering PCI controller with io_map_base unset
[    0.090000] ar71xx: invalid MDIO id 1
[    0.500000] bio: create slab <bio-0> at 0
[    0.500000] PCI host bridge to bus 0000:00
[    0.510000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x11ffffff]
[    0.510000] pci_bus 0000:00: root bus resource [io  0x0000]
[    0.520000] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    0.520000] Switching to clocksource MIPS
[    0.530000] NET: Registered protocol family 2
[    0.530000] TCP established hash table entries: 512 (order: 0, 4096 bytes)
[    0.540000] TCP bind hash table entries: 512 (order: -1, 2048 bytes)
[    0.550000] TCP: Hash tables configured (established 512 bind 512)
[    0.550000] TCP: reno registered
[    0.560000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.560000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.570000] NET: Registered protocol family 1
[    0.590000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.590000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.610000] msgmni has been set to 119
[    0.610000] io scheduler noop registered
[    0.610000] io scheduler deadline registered (default)
[    0.620000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[    0.650000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
[    0.650000] console [ttyS0] enabled, bootconsole disabled
[    0.650000] console [ttyS0] enabled, bootconsole disabled
[    0.670000] ath79-spi ath79-spi: master is unqueued, this is deprecated
[    0.670000] m25p80 spi0.0: found w25q128, expected m25p80
[    0.680000] m25p80 spi0.0: w25q128 (16384 Kbytes)
[    0.690000] spi0.0: no TP-Link header found
[    0.710000] libphy: ag71xx_mdio: probed
[    1.270000] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04 [uid=004dd042, driver=Generic PHY]
[    1.280000] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[    1.840000] ag71xx-mdio.1: Found an AR934X built-in switch
[    2.870000] eth1: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[    2.880000] TCP: cubic registered
[    2.880000] NET: Registered protocol family 17
[    2.890000] 8021q: 802.1Q VLAN Support v1.8
[    2.890000] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[    2.900000] Please append a correct "root=" boot option; here are the available partitions:
[    2.910000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

修改target/linux/ar71xx/files/drivers/mtd中的分区信息中的

#define TPLINK_KERNEL_OFFS      0x40000

此处的TPLINK_KERNEL_OFFS为FLASH中分区存放地址。