制作ramdisk遇到的问题，恳请高手指教

mshaowei

因为ramdisk中libc库不匹配的原因，需要修改lib库，修改后，整个ramdisk变大，下到板子上，提示RAMDISK :Compress out of range
后来删除一些认为不必要的lib库，结果错误如下：
init:eKernel panic:Attempted to kill init!
error while loading shared libraries:cannot open shared object file:
cannot load shared object file:No Such file or directory

  恳请高手指教，谢谢！

mshaowei

error如下：
RAMDISK: incomplete write (30720 != 3276, only wrote 16711680
Freeing initrd memory: 5468K
VFS: Mounted root (ext2 filesystem).
Mounted devfs on /dev
Freeing init memory: 56K
init: eKernel panic: Attempted to kill init!
rro r while loading shared libraries: cannot open shared object file: cannot loa
d shared object file: No such file or directory

   RAMDISK: incomplete write (30720 != 3276, only wrote 16711680
     新的ramdisk.gz大小为5.1M，原来的5M
是因为dd if=/dev/zero of=/images/initrd.img bs=4096 count=4096 是bs的大小设置的问题吗？
   还是其他地方限制了ramdisk的大小呢？求助，十分感谢！

mshaowei

我重新编译了内核，解决了ramdisk提示Compress ran out of range的错误 make menuconfig 的时候在general 选项里的倒数第二个选项中应该把默认的内核命令字符串设为：console=ttys0,115200 initrd=0x21000000（注：这个指明了文件系统的起始位
置）,5346423(注：这个值指定文件系统的大小) root=/dev/ram rw，然后将ramdisk中的lib 换为所需的libc-2.2.3.so及它的符号连接，下到板子上运行出现如下的错误，
请问dd命令中的bs设置大小有什么要求吗？有技巧吗？
把命令写到下面，请提醒谢谢！
1. Uncompress ramdisk image
#gunzip -v ramdisk.gz
2.Mount ramdisk images
#mkdir -p /mnt/tmp
#mount -o loop ramdisk /mnt/tmp -t ext2
3.Create new ramdisk image
#dd if=/dev/zero of=new_ramdisk bs=4096 count=4096
#mke2fs -F -m0 -v new_ramdisk
#tune2fs -c 0 new_ramdisk
#mkdir -p /mnt/new
#mount -o loop new_ramdisk /mnt/new -t ext2
4.Copy files from old ramdisk to new ramdisk
#cd /mnt/tmp
#find . -depth -print|cpio -VBpdum /mnt/new
5.modify new ramdisk lib
6.Unmount ramdisk image:
#umount /mnt/tmp
#umount /mnt/new
7.Compress new ramdisk images
#gzip -v9 -c new_ramdisk>;ramdisk.gz
这是我综合网上和书上的命令，制作ramdisk images的过程
错误如下：
RAMDISK: Compressed image found at block 0
RAMDISK: incomplete write (-28 != 3276, only wrote 8388608//猜测是bs大小的问题
Freeing initrd memory: 5221K
VFS: Mounted root (ext2 filesystem).
attempt to access beyond end of device
01:00: rw=0, want=8227, limit=8192
EXT2-fs error (device ramdisk(1,0)): ext2_read_inode: unable to read inode block
- inode=2288, block=8226
mount_devfs_fs(): unable to mount devfs, err: -5
Freeing init memory: 52K
Warning: unable to open an initial console.
attempt to access beyond end of device
01:00: rw=0, want=8205, limit=8192
EXT2-fs error (device ramdisk(1,0)): ext2_read_inode: unable to read inode block
- inode=2109, block=8204
attempt to access beyond end of device
01:00: rw=0, want=8211, limit=8192
EXT2-fs error (device ramdisk(1,0)): ext2_read_inode: unable to read inode block
- inode=2158, block=8210
Kernel panic: No init found. Try passing init= option to kernel

RAMDISK: incomplete write (-28 != 3276, only wrote 8388608//猜测是bs大小的问题
ext2_read_inode: unable to read inode block 我猜测是无法读取的问题，请问有什么好的解决方法吗？再次表示感谢！

流氓无产者

编译内核的时候ramdisk size缺省是4M

mshaowei

[quote]原帖由 "流氓无产者"]编译内核的时候ramdisk size缺省是4M[/quote 发表：

可是ramdisk的大小大于4M呀！

mshaowei

调试其他程序后，今天又重新查看了编译内核时的选项，还需要在block device中需要设定ramdisk的大小，改为解压后的大小，重新编译内核，加载文件系统，成功！