Hello Walter, Please see below mentioned text which I extracted from "ramfs-rootfs-initramfs.txt"
What is initramfs? 83 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#83> ------------------ 84 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#84> 85 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#85> All 2.6 Linux kernels contain a gzipped "cpio" format archive, which is 86 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#86> extracted into rootfs when the kernel boots up. After extracting, the kernel 87 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#87> checks to see if rootfs contains a file "init", and if so it executes it as PID 88 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#88> 1. _*If found, this init process is responsible for bringing the system the 89 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#89> rest of the way up, including locating and mounting the real root device (if 90 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#90> any).*_ If rootfs does not contain an init program after the embedded cpio 91 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#91> archive is extracted into it, the kernel will fall through to the older code 92 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#92> to locate and mount a root partition, then exec some variant of /sbin/init 93 <http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt#93> out of that. So according to them , its init responsibility to mount the real root device, I think VI init works in that way, but not sure about the busybox Init. Can anyone clarify me that? I have post my question to LFS also. Thanks Rajeev Bansal. walter harms wrote: > Rajeev Bansal wrote: > >> Hi Mike, >> >> Thanks for replying the query. >> >> I am not sure about this but don't you think when you run the command >> switchroot in init script, then its Init's job to remount the previous >> mounted root with read-write options. >> >> Thanks >> -Rajeev >> >> > > > hi Rajeev, > from 'man init' > Init is the parent of all processes. Its primary role is to create > processes from a script stored in the file /etc/inittab (see init- > tab(5)). This file usually has entries which cause init to spawn get- > tys on each line that users can log in. It also controls autonomous > processes required by any particular system. > > obviously it is NOT the job of init to mount anything or even to know about > mounting. > he is starting and supervising processes nothing more. doing a UNIX from > scratch is > a huge undertaking. People from "linux from scratch" are much more prepared > (and > capable) than the busybox ml to explain details of a system start-up. > see: http://www.linuxfromscratch.org/ > > re, > wh > > > ******************************************************************************** This email message (including any attachments) is for the sole use of the intended recipient(s) and may contain confidential, proprietary and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please immediately notify the sender by reply email and destroy all copies of the original message. Thank you. Intoto Inc. _______________________________________________ busybox mailing list [email protected] http://busybox.net/cgi-bin/mailman/listinfo/busybox
