Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 26 Mar 2001 18:41:17 -0800 | From | Amit D Chaudhary <> | Subject | question information request on init boot sequence when using initrd |
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Hi,
We(my team) had some questions regarding booting from initrd and using /linuxrc. It will help someone(David, Werner,...) can give their thoughts on this.
To put it in brief, since running sbin/init from /linuxrc as resulting in init not having PID 1 and thereby not doing some initialization as expected.
Thereby instead of loading running /sbin/init, we just set /proc/sys/kernel/real-root-dev to /dev/ram0's value which then does the following runs 2 statements in init/main.c to unlock_kernel and free init memory and then run sbin/init. This results in /sbin/init running fine.
Is this ok or should be modify /sbin/init to run properly inspite of PID <> 1 or is there a 3rd way of doing this?
Thanks Amit
This is on linux-2.4.1 kernel running on PPC. /linuxrc is as follow:
../bin/mount -t ramfs none tmp_rootfs
#untar'ing the new root. ../bin/tar -b 512 -zxf /dev/mtd1
mkdir initrd ../bin/pivot_root . initrd
exec sbin/chroot . sbin/init.new 3 <dev/console >dev/console 2>&1
The above results in init running with PID != 1 and thereby skipping some relevant processing my default. see ps output below:
Instead of the "chroot" above is changed to following exec sbin/chroot . sh -c 'bin/mount proc proc -t proc; echo 0x01000000 > proc/sys/kernel/real-root-dev' And linuxrc exits
(none):root> ps -e PID TTY TIME CMD 1 ? 00:00:04 swapper 2 ? 00:00:00 keventd 3 ? 00:00:00 kswapd 4 ? 00:00:00 kreclaimd 5 ? 00:00:00 bdflush 6 ? 00:00:00 kupdate 7 ? 00:00:00 mtdblockd 8 ? 00:00:00 init 26 ? 00:00:00 sh 39 ? 00:00:00 portmap 50 ? 00:00:00 ypbind 51 ? 00:00:00 ypbind 84 ? 00:00:00 inetd 93 ? 00:00:00 syslogd 100 ? 00:00:00 klogd 119 ? 00:00:00 ps
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