系统在以读写的方式重新挂载后起不来
最近遇到一个很奇怪的问题，我的环境是一个arm的开发板，在终端执行一下命令后，重启，系统起不来：mount -n -o remount,noatime,rw /
mount -n -o remount,noatime,ro /
两个命令之前没有任何操作，下面是系统日志，请各位大神帮忙分析一下，比较紧急，希望各位大神指点迷境，谢谢。RomBOOT
Start AT91Bootstrap...
U-Boot 2010.06-dirty (Sep 07 2015 - 16:15:49)
DRAM:32 MiB
NAND:128 MiB
ADC=928, SEQ=1
PRODUCT_SEQ 01. HARDWARE ID 01
Init WFET1600XGW
In: serial
Out: serial
Err: serial
Press space to abort autoboot in: 1
NAND read: device 0 offset 0x80000, size 0x300000
3145728 bytes read: OK
## Booting kernel from Legacy Image at 20600000 ...
Image Name: Linux-2.6.39
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1545056 Bytes = 1.5 MiB
Load Address: 20008000
Entry Point:20008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Linux version 2.6.39 (W08582@Debian7) (gcc version 4.7.3 (Sourcery CodeBench Lite 2013.05-24) ) #1 Wed Jul 22 09:13:15 CST 2015
CPU: ARM926EJ-S revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Atmel AT91SAM9X5-EK
Memory policy: ECC disabled, Data cache writeback
Clocks: CPU 400 MHz, master 133 MHz, main 12.000 MHz
Built 1 zonelists in Zone order, mobility grouping on.Total pages: 8128
Kernel command line: rootfstype=ubifs ubi.mtd=4 ro root=ubi0:rootfs mtdparts=at91_nand:128k(bootstrap),256k(u-boot),128k(u-bootenv),3072k(kernel),14m(rootfs),20m(home),66m(data0),-(data1) vlcd=0xC8 console=ttyS2 openwd
PID hash table entries: 128 (order: -3, 512 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 32MB = 32MB total
Memory: 29424k/29424k available, 3344k reserved, 0K highmem
Virtual kernel memory layout:
vector: 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap: 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffa00000 - 0xffe00000 ( 4 MB)
vmalloc : 0xc2800000 - 0xfee00000 ( 966 MB)
lowmem: 0xc0000000 - 0xc2000000 (32 MB)
modules : 0xbf000000 - 0xc0000000 (16 MB)
.init : 0xc0008000 - 0xc0024000 ( 112 kB)
.text : 0xc0024000 - 0xc02c72a0 (2701 kB)
.data : 0xc02c8000 - 0xc02e3f00 ( 112 kB)
NR_IRQS:192
AT91: 128 gpio irqs in 4 banks
Calibrating delay loop... 199.06 BogoMIPS (lpj=995328)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
AT91: CM rev B and higher
AT91: No default serial console defined.
AT91: EK rev A
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
at_hdmac at_hdmac.0: Atmel AHB DMA Controller ( cpy slave ), 8 channels
at_hdmac at_hdmac.1: Atmel AHB DMA Controller ( cpy slave ), 8 channels
Switching to clocksource pit
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
NetWinder Floating Point Emulator V0.97 (double precision)
msgmni has been set to 57
io scheduler noop registered (default)
atmel_usart.0: ttyS0 at MMIO 0xf801c000 (irq = 5) is a ATMEL_SERIAL
atmel_usart.1: ttyS1 at MMIO 0xf8044000 (irq = 16) is a ATMEL_SERIAL
atmel_usart.2: ttyS2 at MMIO 0xfefff200 (irq = 1) is a ATMEL_SERIAL
console enabled
atmel_usart.3: ttyS3 at MMIO 0xf8020000 (irq = 6) is a ATMEL_SERIAL
atmel_usart.4: ttyS4 at MMIO 0xf8024000 (irq = 7) is a ATMEL_SERIAL
atmel_usart.5: ttyS5 at MMIO 0xf8028000 (irq = 8) is a ATMEL_SERIAL
atmel_usart.6: ttyS6 at MMIO 0xf8040000 (irq = 15) is a ATMEL_SERIAL
atmel_nand atmel_nand: No DMA support for NAND access.
NAND device: Manufacturer ID: 0x98, Chip ID: 0xd1 (Toshiba NAND 128MiB 3,3V 8-bit)
atmel_pmecc_init_params
Scanning device for bad blocks
mtd_name=bootstrap,mtd_size=0x20000,offset=0x0
mtd_name=u-boot,mtd_size=0x40000,offset=0x0
mtd_name=u-bootenv,mtd_size=0x20000,offset=0x0
mtd_name=kernel,mtd_size=0x300000,offset=0x0
mtd_name=rootfs,mtd_size=0xe00000,offset=0x0
mtd_name=home,mtd_size=0x1400000,offset=0x0
mtd_name=data0,mtd_size=0x4200000,offset=0x0
mtd_name=data1,mtd_size=0x1880000,offset=0x0
8 cmdlinepart partitions found on MTD device at91_nand
Creating 8 MTD partitions on "at91_nand":
0x000000000000-0x000000020000 : "bootstrap"
0x000000020000-0x000000060000 : "u-boot"
0x000000060000-0x000000080000 : "u-bootenv"
0x000000080000-0x000000380000 : "kernel"
0x000000380000-0x000001180000 : "rootfs"
0x000001180000-0x000002580000 : "home"
0x000002580000-0x000006780000 : "data0"
0x000006780000-0x000008000000 : "data1"
UBI: attaching mtd4 to ubi0
UBI: physical eraseblock size: 131072 bytes (128 KiB)
UBI: logical eraseblock size: 126976 bytes
UBI: smallest flash I/O unit: 2048
UBI: VID header offset: 2048 (aligned 2048)
UBI: data offset: 4096
UBI: max. sequence number: 3
UBI: attached mtd4 to ubi0
UBI: MTD device name: "rootfs"
UBI: MTD device size: 14 MiB
UBI: number of good PEBs: 112
UBI: number of bad PEBs: 0
UBI: number of corrupted PEBs: 0
UBI: max. allowed volumes: 128
UBI: wear-leveling threshold: 4096
UBI: number of internal volumes: 1
UBI: number of user volumes: 1
UBI: available PEBs: 0
UBI: total number of reserved PEBs: 112
UBI: number of PEBs reserved for bad PEB handling: 2
UBI: max/mean erase counter: 1/0
UBI: image sequence number:1445395432
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
at91_ohci at91_ohci: AT91 OHCI
at91_ohci at91_ohci: new USB bus registered, assigned bus number 1
at91_ohci at91_ohci: irq 22, io mem 0x00600000
UBI: background thread "ubi_bgt0d" started, PID 205
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
Hardware watchdog heartbeat 500 ms.
AT91 Watchdog Timer boot enabled (15 seconds, nowayout)
TCP cubic registered
NET: Registered protocol family 17
Registering the dns_resolver key type
name=ubi0:rootfs
fs_names=/init
atmel_nand atmel_nand: Too many error.
atmel_nand atmel_nand: Too many error.
atmel_nand atmel_nand: Too many error.
atmel_nand atmel_nand: Too many error.
UBI error: ubi_io_read: error -1 while reading 126976 bytes from PEB 3:4096, read 2048 bytes
UBIFS error (pid 1): ubifs_start_scan: cannot read 126976 bytes from LEB 1:0, error -1
VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00 128 mtdblock0(driver?)
1f01 256 mtdblock1(driver?)
1f02 128 mtdblock2(driver?)
1f03 3072 mtdblock3(driver?)
1f04 14336 mtdblock4(driver?)
1f05 20480 mtdblock5(driver?)
1f06 67584 mtdblock6(driver?)
1f07 25088 mtdblock7(driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[<c002eca8>] (unwind_backtrace+0x0/0xe0) from [<c01fa1e4>] (panic+0x50/0x178)
[<c01fa1e4>] (panic+0x50/0x178) from [<c0008d44>] (mount_block_root+0x24c/0x2a4)
[<c0008d44>] (mount_block_root+0x24c/0x2a4) from [<c0008e8c>] (prepare_namespace+0x88/0x17c)
[<c0008e8c>] (prepare_namespace+0x88/0x17c) from [<c00089c0>] (kernel_init+0x100/0x134)
[<c00089c0>] (kernel_init+0x100/0x134) from [<c002aef8>] (kernel_thread_exit+0x0/0x8)
感觉要么是驱动，要么是硬件有问题
可能一回写，就导致校验或者别的什么数据结构被破坏 回复 2# 流氓无产者
谢谢，问题解决了，是当初烧制镜像的时候出了问题，在开发板上写入rootfs.img时，没有去掉0xFF，是PMECC的原因。
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