关于linuxrc不能执行的问题

只看该作者 · 2009-3-6 21:12

linux在2410上面启动时的打印信息

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NAND read: device 0 offset 0x100000, size 0x300000
3145728 bytes read: OK
## Starting application at 0x30008000 ...
Uncompressing Linux.............................................................
done, booting the kernel.
Linux version 2.6.14.1 (jade@ubuntu) (gcc version 3.4.5) #2 Thu Mar 5 14:42:12 C
ST 2009
CPU: ARM920Tid(wb) [41129200] revision 0 (ARMv4T)
Machine: SMDK2410
Warning: bad configuration page, trying to continue
Memory policy: ECC disabled, Data cache writeback
CPU S3C2410A (id 0x32410002)
S3C2410: core 202.800 MHz, memory 101.400 MHz, peripheral 50.700 MHz
S3C2410 Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists
Kernel command line: noinitrd root=/dev/mtdblock2 init=/linuxrc console=ttySAC0,
115200
irq: clearing subpending status 00000002
PID hash table entries: 128 (order: 7, 2048 bytes)
timer tcon=00500000, tcnt a509, tcfg 00000200,00000000, usec 00001e4c
Console: colour dummy device 80x30
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 16MB = 16MB total
Memory: 14232KB available (1501K code, 342K data, 84K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
softlockup thread 0 started up.
NET: Registered protocol family 16
S3C2410: Initialising architecture
S3C2410 DMA Driver, (c) 2003-2004 Simtec Electronics
DMA channel 0 at c1800000, irq 33
DMA channel 1 at c1800040, irq 34
DMA channel 2 at c1800080, irq 35
DMA channel 3 at c18000c0, irq 36
NetWinder Floating Point Emulator V0.97 (double precision)
devfs: 2004-01-31 Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
Console: switching to colour frame buffer device 80x25
fb0: Virtual frame buffer device, using 1024K of video memory
S3C2410 RTC, (c) 2004 Simtec Electronics
s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2410
s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2410
s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2410
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c2410-nand: mapped registers at c1980000
s3c2410-nand: timing: Tacls 10ns, Twrph0 30ns, Twrph1 10ns
NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit
)
NAND_ECC_NONE selected by board driver. This is not recommended !!
Scanning device for bad blocks
Creating 4 MTD partitions on "NAND 64MiB 3,3V 8-bit":
0x00000000-0x00100000 : "bootloader"
0x00100000-0x00400000 : "kernel"
0x00400000-0x02c00000 : "root"
0x02d00000-0x03c00000 : "user"
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2
IP route cache hash table entries: 256 (order: -2, 1024 bytes)
TCP established hash table entries: 1024 (order: 0, 4096 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
TCP bic registered
NET: Registered protocol family 1
Reading data from NAND FLASH without ECC is not recommended
VFS: Mounted root (cramfs filesystem) readonly.
Mounted devfs on /dev
Freeing init memory: 84K
Failed to execute /linuxrc.  Attempting defaults...
Kernel panic - not syncing: No init found.  Try passing init= option to kernel.

网上分析linuxrc不能运行无非三点原因
1 linuxrc不具备可执行属性
2 linuxrc的解释shell不在首行
3 linuxrc的解释shell不存在

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ls linuxrc -al
-rwxrwxr-x 1 root root 687 1970-01-01 08:00 linuxrc

说明第一条排除

root的结构

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|-- bin
|   |-- ash -> busybox
|   |-- busybox
|   |-- cat -> busybox
|   |-- cp -> busybox
|   |-- echo -> busybox
|   |-- ls -> busybox
|   |-- mkdir -> busybox
|   |-- mount -> busybox
|   |-- mv -> busybox
|   |-- pwd -> busybox
|   |-- rm -> busybox
|   |-- touch -> busybox
|   |-- umount -> busybox
|   `-- vi -> busybox
|-- dev
|-- etc
|-- home
|-- lib
|-- linuxrc
|-- linuxrc~
|-- mnt
|   `-- etc
|-- proc
|-- root
|-- sbin
|   |-- halt -> ../bin/busybox
|   |-- init -> ../bin/busybox
|   |-- poweroff -> ../bin/busybox
|   |-- reboot -> ../bin/busybox
|   `-- start-stop-daemon -> ../bin/busybox
|-- sys
|-- tmp
`-- usr
    |-- bin
    |   |-- [ -> ../../bin/busybox
    |   |-- ][][ -> ../../bin/busybox
    |   |-- env -> ../../bin/busybox
    |   |-- mesg -> ../../bin/busybox
    |   `-- test -> ../../bin/busybox
    |-- lib
    `-- sbin

linuxrc的内容

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#!/bin/sh#挂载/etc 为 ramfs, 并从/mnt/etc 下拷贝文件到/etc 目录当中
echo "mount /etc as ramfs"
/bin/mount -n -t ramfs ramfs /etc
/bin/cp -a /mnt/etc/* /etc
echo "re-create the /etc/mtab entries"
# re-create the /etc/mtab entries
/bin/mount -f -t cramfs -o remount,ro /dev/mtdblock/2 /
#mount some file system
echo "------------mount /dev/shm as tmpfs"
/bin/mount -n -t tmpfs tmpfs /dev/shm
#挂载/proc 为 proc 文件系统
echo "------------mount /proc as proc"
/bin/mount -n -t proc none /proc
#挂载/sys 为 sysfs 文件系统
echo "------------mount /sys as sysfs"
/bin/mount -n -t sysfs none /sys
exec /sbin/init

我把第一行改成了#!/bin/ash也不行，因为在/bin下面没看见sh，只看见ash。
请高手解答一下这是什么原因哦。
没有装tinylog什么的，是不是嵌入式linux默认的就是root用户啊？