[备份]了解initramfs，越往深处走觉着需要了解的东西越多，所以干脆回来，从实际系统的实现开始寻迹。在学习的这个系统中，里面用了busybox，实现的系统可谓精简之又精简。早上主要学习了root=31:03这一设置，然后引出了sysfs这一话题，然后又搜到了如下内容。暂留档。
Busybox is a package that replaces a dozen standard packages, but it is not by itself a complete bootable system. Building an entire Linux distribution from source is a bit beyond the scope of this FAQ, but it understandably keeps cropping up on the mailing list, so here are some pointers.
Start by learning how to strip a working system down to the bare essentials needed to run one or two commands, so you know what it is you actually need. An excellent practical place to do this is the Linux BootDisk Howto, or for a more theoretical approach try From PowerUp to Bash Prompt.
To learn how to build a working Linux system entirely from source code, the place to go is the Linux From Scratch project. They have an entire book of step-by-step instructions you can read online or download. Be sure to check out the other sections of their main page, including Beyond Linux From Scratch, Hardened Linux From Scratch, their Hints directory, and their LiveCD project. (They also have mailing lists which are better sources of answers to Linux-system building questions than the Busybox list.)
If you want an automated yet customizable system builder which produces a Busybox and uClibc based system, try buildroot, which is another project by the maintainer of the uClibc (Erik Andersen). Download the tarball, extract it, unset CC, make. For more instructions, see the website.
这些讯息是从这里拿到的，感谢博主慷慨：http://www.landley.net/writing/