openwrt在9344上可以引导内核不能加载根文件系统

allenhuang87

本人想将openwrt移植到9344的板子上，在下载attitude_adjustment_12.09分支后，完成Target System， Target Profile (Atheros DB120 reference board) 后，编译版本后生成bin文件。
通过串口烧录到分区中，内核可以引导，但在加载根文件系统失败，对于这种问题，应该怎么去排查并找出解决办法?
启动日志如下：

1. [    0.000000] Linux version 3.3.8 (root@linuxwang) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #19 Tue Nov 11 01:57:59 CST 2014
   
2. [    0.000000] bootconsole [early0] enabled
   
3. [    0.000000] CPU revision is: 0001974c (MIPS 74Kc)
   
4. [    0.000000] SoC: Atheros AR9344 rev 2
   
5. [    0.000000] Clocks: CPU:560.000MHz, DDR:480.000MHz, AHB:240.000MHz, Ref:40.000MHz
   
6. [    0.000000] Determined physical RAM map:
   
7. [    0.000000]  memory: 08000000 @ 00000000 (usable)
   
8. [    0.000000] Initrd not found or empty - disabling initrd
   
9. [    0.000000] Zone PFN ranges:
   
10. [    0.000000]   Normal   0x00000000 -> 0x00008000
    
11. [    0.000000] Movable zone start PFN for each node
    
12. [    0.000000] Early memory PFN ranges
    
13. [    0.000000]     0: 0x00000000 -> 0x00008000
    
14. [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
    
15. [    0.000000] Kernel command line:  board=DB120 console=ttyS0,115200 mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,6336k(rootfs),1408k(kernel),64k(nvram),64k(art)ro,7744k@0x50000(firmware) root=31:02 rootfstype=squashfs noinitrd
    
16. [    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
    
17. [    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
    
18. [    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
    
19. [    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
    
20. [    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
    
21. [    0.000000] Writing ErrCtl register=00000000
    
22. [    0.000000] Readback ErrCtl register=00000000
    
23. [    0.000000] Memory: 126612k/131072k available (2086k kernel code, 4460k reserved, 403k data, 208k init, 0k highmem)
    
24. [    0.000000] SLUB: Genslabs=9, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    
25. [    0.000000] NR_IRQS:51
    
26. [    0.000000] Calibrating delay loop... 278.93 BogoMIPS (lpj=1394688)
    
27. [    0.070000] pid_max: default: 32768 minimum: 301
    
28. [    0.070000] Mount-cache hash table entries: 512
    
29. [    0.080000] NET: Registered protocol family 16
    
30. [    0.080000] gpiochip_add: registered GPIOs 0 to 22 on device: ath79
    
31. [    0.090000] MIPS: machine is Atheros DB120 reference board
    
32. [    0.100000] ar724x-pci ar724x-pci: PCIe link is down
    
33. [    0.100000] registering PCI controller with io_map_base unset
    
34. [    0.510000] bio: create slab <bio-0> at 0
    
35. [    0.520000] PCI host bridge to bus 0000:00
    
36. [    0.520000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
    
37. [    0.530000] pci_bus 0000:00: root bus resource [io  0x0000]
    
38. [    0.530000] Switching to clocksource MIPS
    
39. [    0.540000] NET: Registered protocol family 2
    
40. [    0.540000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
    
41. [    0.550000] TCP established hash table entries: 4096 (order: 3, 32768 bytes)
    
42. [    0.560000] TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
    
43. [    0.560000] TCP: Hash tables configured (established 4096 bind 4096)
    
44. [    0.570000] TCP reno registered
    
45. [    0.570000] UDP hash table entries: 256 (order: 0, 4096 bytes)
    
46. [    0.580000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
    
47. [    0.580000] NET: Registered protocol family 1
    
48. [    0.600000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
    
49. [    0.610000] JFFS2 version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
    
50. [    0.620000] msgmni has been set to 247
    
51. [    0.620000] io scheduler noop registered
    
52. [    0.620000] io scheduler deadline registered (default)
    
53. [    0.630000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
    
54. [    0.660000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
    
55. [    0.660000] console [ttyS0] enabled, bootconsole disabled
    
56. [    0.660000] console [ttyS0] enabled, bootconsole disabled
    
57. [    0.680000] m25p80 spi0.0: found mx25l25635e, expected m25p80
    
58. [    0.680000] m25p80 spi0.0: mx25l25635e (32768 Kbytes)
    
59. [    0.690000] 7 cmdlinepart partitions found on MTD device spi0.0
    
60. [    0.690000] Creating 7 MTD partitions on "spi0.0":
    
61. [    0.700000] 0x000000000000-0x000000040000 : "u-boot"
    
62. [    0.710000] 0x000000040000-0x000000050000 : "u-boot-env"
    
63. [    0.710000] 0x000000050000-0x000000680000 : "rootfs"
    
64. [    0.720000] mtd:  partition "rootfs" set to be root filesystem
    
65. [    0.730000] magic is 73717368 actual:0 in ""
    
66. [    0.730000] split_squashfs: no squashfs found in "spi0.0"
    
67. [    0.740000] 0x000000680000-0x0000007e0000 : "kernel"
    
68. [    0.740000] 0x0000007e0000-0x0000007f0000 : "nvram"
    
69. [    0.750000] 0x0000007f0000-0x000000800000 : "art"
    
70. [    0.760000] 0x000000050000-0x0000007e0000 : "firmware"
    
71. [    0.780000] ag71xx_mdio: probed
    
72. [    0.790000] ag71xx_mdio: probed
    
73. [    0.790000] eth0: Atheros AG71xx at 0xb9000000, irq 4
    
74. [    1.350000] ag71xx ag71xx.0: eth0: no PHY found with phy_mask=00000001
    
75. [    1.350000] eth0: Atheros AG71xx at 0xba000000, irq 5
    
76. [    1.910000] eth0: Found an AR934X built-in switch
    
77. [    2.950000] TCP cubic registered
    
78. [    2.950000] NET: Registered protocol family 17
    
79. [    2.950000] 8021q: 802.1Q VLAN Support v1.8
    
80. [    2.960000] List of all partitions:
    
81. [    2.960000] 1f00             256 mtdblock0  (driver?)
    
82. [    2.970000] 1f01              64 mtdblock1  (driver?)
    
83. [    2.970000] 1f02            6336 mtdblock2  (driver?)
    
84. [    2.980000] 1f03            1408 mtdblock3  (driver?)
    
85. [    2.980000] 1f04              64 mtdblock4  (driver?)
    
86. [    2.990000] 1f05              64 mtdblock5  (driver?)
    
87. [    2.990000] 1f06            7744 mtdblock6  (driver?)
    
88. [    3.000000] No filesystem could mount root, tried:  squashfs
    
89. [    3.010000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)

复制代码

Tinnal

看看 31、2这个块设备是否存在，如果存在，把它解出来，看看在host里能不能用squashfs挂载。

allenhuang87

回复 2# Tinnal


    这个分区应该在吧，内核分区都在的话，应该文件系统分区也在吧！如果要看怎么去查看是否分区存在？
"它解出来，看看在host里能不能用squashfs挂载"怎么操作？

yangPSO

Kernel command line:  board=DB120 console=ttyS0,115200 mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,6336k(rootfs),1408k(kernel),64k(nvram),64k(art)ro,7744k@0x50000(firmware) root=31:02 rootfstype=squashfs noinitrd


确定文件系统类型是否正确

allenhuang87

怎么确认？？回复 4# yangPSO


   

yangPSO

你自己制作的根文件系统，类型不知道吗，比如是不是jff2

allenhuang87

根据编译生成文件可以知道是squashfs文件系统
选择openwrt-ar71xx-generic-db120-rootfs-squashfs.bin文件烧写到文件系统分区中
回复 6# yangPSO


   

yangPSO

那你在函数squashfs_fill_super()中添加一些调试语句，首先确认函数执行了没有，然后看看哪里报错了没有

yangPSO

那你在函数squashfs_fill_super()中添加一些调试语句，首先确认函数执行了没有，然后看看哪里报错了没有
你可以把其中的TRACE和ERROR宏打印生效
【不小心发多了一次】