Build LFS problem sets

VM:

Linux: Ubuntu11.10

LFS version 6.8(2011-10-10)

1. 5.7. Glibc-2.14

when i execute 'make' will output this : ...make[1]: *** No rule to make target `/mnt/lfs/sources/glibc-build/Versions.all', needed by `/mnt/lfs/sources/glibc-build/abi-versions.h'. Stop.

Anyc:ubuntu11.10's /usr/bin/awk  use /usr/bin/gawk by default, otherise use /usr/bin/mawk, and mawk can't understand any characters which is '/' cause that"/\/[^/]+$/"


Resolve:exit user lfs(because lfs have no permission install), sudo apt-get install gawk and re-configure and re-compile


Note:

It is a known issue that mawk does not understand unescaped '/' in character classes at least up to version 1.3.3-15 (the one supplied on Ubuntu 11.04 (Natty)).mawk will think the/ inside the bracket terminates the regex, and interpret as\/[^, which is surely a syntax error due to unmatched].

The fix for glibc is trivial: just add a \ before the /. But this may also be a dedicate "check"to ensuregawk is used. At least this is still not changed on glibc-2.14…

2. 5.16. Bash-4.2

when I execute "make" will appear 'make: yacc: Command not found

make: *** [y.tab.c] Error 127"'

Anyc: yacc is in the bison package.
Resolve: sudo apt-get install bison.

8.3. Linux-2.6.37

Problem:

md: If you don't use raid, use raid=noautodetect
md: Autodetecting RAID arrays.
md: Scanned 0 and added 0 devices.
md: autorun ...
Root-NFS: no NFS server address
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "sdb1" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions"
0b00 1048575 sr0 driver:sr
Kernel panic - not syncing: VFS: Unable to mount root fs on unknow-block(2,0)
Pid: 1, comm: swapper Not tainted 2.6.37 #1
Call Trace:
[*]? printk+0xf/0x11
[*]panic+0x50/0x146
[*]mount_block_root+0x15b/0x16a
[*]?sys_mknod+0x13/0x15

Any:  not build rootfs in partition to linux kernel

这是由于没有把rootfs所在的磁盘驱动编译进内核的原因，我的平台是 VMware6.5，对应的磁盘是SCSI类型设备中的LSI Logic设备，在配置内核时需要将如下内容选中，注意这里不能编译为模块：

     Linux Kernel Configuration--->
　　 　Device Drivers --->
　　 　<*> SCSI device support


    Device Drivers  --->
           [*]  Fusion MPT device support  --->

      Fusion这个箭头里面的选项有5项，具体哪个需要哪个不需要我也不太清楚，除了logging那项我都勾上了。

     对于不同平台，可以通过lspci查看pci设备的名称从而选择不同驱动。

LFS备份的方法

   LFS book中没有讲到备份方法，我曾经试图以简单的tar和cp来备份，都不太对，tar中途会提示出错，而cp会提示没有权限，总的原因是/dev下设备节点和/proc及/sys文件系统不能简单的拷贝和打包。LFS网站上有一个比较完备的备份方法http://www.linuxfromscratch.org/hints/downloads/files/backing-up-lfs.txt，我这里是搜索lfs-supportmailing list（在LFS主页右上角搜索即可）得到的一个简单方法：

    tar -C $LFS --one-file-system -cjvpf lfs-backup.tar.bz2 .

    其中，

   -C指切换目录至￥LFS，这样创建出来的压缩包根目录是 . ，而不是/mnt/lfs

   --one-file-sysem 忽略不在本文件系统上的目录，这样/proc，/sys，/dev中的文件不会被拷贝，以后恢复得时候需要重复LFS book chap6.2来新建设备节点

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ID: 22920 
Name: jinwei 
First LFS Version: 6.8