Hi All, I could find the problem in my init script, actually I was using switchroot command to move from my old root to new root. But busybox gives switch_root in place of switchroot. So when I replaced the switchroot with switch_root command, I could see it was mounting the new root fs which is /dev/sda2 in my case. But after that it was giving me the Kernel panic. I don't know why it was behaving like that. Ideally kernel should go and execute /sbin/init. I am mentioning below my new init script.
#!/bin/nash mount -t proc /proc /proc setquiet echo Mounting proc filesystem echo Mounting sysfs filesystem mount -t sysfs /sys /sys echo Creating /dev mount -o mode=0755 -t tmpfs /dev /dev mkdir /dev/pts mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts mkdir /dev/shm mkdir /dev/mapper echo Creating initial device nodes mknod /dev/null c 1 3 mknod /dev/zero c 1 5 mknod /dev/systty c 4 0 mknod /dev/tty c 5 0 mknod /dev/console c 5 1 mknod /dev/ptmx c 5 2 mknod /dev/rtc c 10 135 mknod /dev/tty0 c 4 0 mknod /dev/tty1 c 4 1 mknod /dev/tty2 c 4 2 mknod /dev/tty3 c 4 3 mknod /dev/tty4 c 4 4 mknod /dev/tty5 c 4 5 mknod /dev/tty6 c 4 6 mknod /dev/tty7 c 4 7 mknod /dev/tty8 c 4 8 mknod /dev/tty9 c 4 9 mknod /dev/tty10 c 4 10 mknod /dev/tty11 c 4 11 mknod /dev/tty12 c 4 12 mknod /dev/ttyS0 c 4 64 mknod /dev/ttyS1 c 4 65 mknod /dev/ttyS2 c 4 66 mknod /dev/ttyS3 c 4 67 echo Creating block device nodes. mkblkdevs echo "Loading usbcore.ko module" insmod /lib/usbcore.ko echo "Loading uhci-hcd.ko module" insmod /lib/uhci-hcd.ko echo "Loading ohci-hcd.ko module" insmod /lib/ohci-hcd.ko echo "Loading ehci-hcd.ko module" insmod /lib/ehci-hcd.ko mount -t usbfs /proc/bus/usb /proc/bus/usb echo "Loading mbcache.ko module" insmod /lib/mbcache.ko echo "Loading jbd.ko module" insmod /lib/jbd.ko echo "Loading ext3.ko module" insmod /lib/ext3.ko echo "Loading scsi_mod.ko module" insmod /lib/scsi_mod.ko echo "Loading sd_mod.ko module" insmod /lib/sd_mod.ko echo "Loading sg.ko module" insmod /lib/sg.ko echo "Loading libata.ko module" insmod /lib/libata.ko echo "Loading ata_generic.ko module" insmod /lib/ata_generic.ko echo "Loading ata_piix.ko module" insmod /lib/ata_piix.ko echo Waiting for driver initialization. stabilized --hash --interval 250 /proc/scsi/scsi insmod /lib/scsi_wait_scan.ko rmmod scsi_wait_scan mkblkdevs echo Creating root device. mkrootdev -t ext3 -o defaults,ro sda2 echo Mounting root filesystem. mount /sysroot echo Switching to new root and running init. switch_root /dev/sda2 /sbin/init ------------------------> I tried switch_root with or without arguments also. ls -l echo Booting has failed. sleep -1 Thanks Rajeev Bansal. Rajeev Bansal wrote: > Hi All, > > I am trying to boot Ubuntu Kernel using custom root file system. I am > using Busybox's (Version 1.7.0) init for initing my box. I am > observing init is not remounting my system root which is /dev/sda2 in > my case on /. After booting up I observe it has mounted /dev/root on > /, which is also working fine for me. But I want it should remount the > system root (/dev/sda2 ) on /. I am writing my init script which > kernel is executes during init process, and the output of the mount > command just let me know if I am missing something there. > > My Init file looks like that: > > #!/bin/nash > > mount -t proc /proc /proc > setquiet > echo Mounting proc filesystem > echo Mounting sysfs filesystem > mount -t sysfs /sys /sys > echo Creating /dev > mount -o mode=0755 -t tmpfs /dev /dev > mkdir /dev/pts > mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts > mkdir /dev/shm > mkdir /dev/mapper > echo Creating initial device nodes > mknod /dev/null c 1 3 > mknod /dev/zero c 1 5 > mknod /dev/systty c 4 0 > mknod /dev/tty c 5 0 > mknod /dev/console c 5 1 > mknod /dev/ptmx c 5 2 > mknod /dev/rtc c 10 135 > mknod /dev/tty0 c 4 0 > mknod /dev/tty1 c 4 1 > mknod /dev/tty2 c 4 2 > mknod /dev/tty3 c 4 3 > mknod /dev/tty4 c 4 4 > mknod /dev/tty5 c 4 5 > mknod /dev/tty6 c 4 6 > mknod /dev/tty7 c 4 7 > mknod /dev/tty8 c 4 8 > mknod /dev/tty9 c 4 9 > mknod /dev/tty10 c 4 10 > mknod /dev/tty11 c 4 11 > mknod /dev/tty12 c 4 12 > mknod /dev/ttyS0 c 4 64 > mknod /dev/ttyS1 c 4 65 > mknod /dev/ttyS2 c 4 66 > mknod /dev/ttyS3 c 4 67 > echo Creating block device nodes. > mkblkdevs > echo "Loading usbcore.ko module" > insmod /lib/usbcore.ko > echo "Loading uhci-hcd.ko module" > insmod /lib/uhci-hcd.ko > echo "Loading ohci-hcd.ko module" > insmod /lib/ohci-hcd.ko > echo "Loading ehci-hcd.ko module" > insmod /lib/ehci-hcd.ko > mount -t usbfs /proc/bus/usb /proc/bus/usb > echo "Loading mbcache.ko module" > insmod /lib/mbcache.ko > echo "Loading jbd.ko module" > insmod /lib/jbd.ko > echo "Loading ext3.ko module" > insmod /lib/ext3.ko > echo "Loading scsi_mod.ko module" > insmod /lib/scsi_mod.ko > echo "Loading sd_mod.ko module" > insmod /lib/sd_mod.ko > echo "Loading sg.ko module" > insmod /lib/sg.ko > echo "Loading libata.ko module" > insmod /lib/libata.ko > echo "Loading ata_generic.ko module" > insmod /lib/ata_generic.ko > echo "Loading ata_piix.ko module" > insmod /lib/ata_piix.ko > echo Waiting for driver initialization. > stabilized --hash --interval 250 /proc/scsi/scsi > insmod /lib/scsi_wait_scan.ko > rmmod scsi_wait_scan > mkblkdevs > resume LABEL=SWAP-sda2 > echo Creating root device. > mkrootdev -t ext3 -o defaults,rw sda1 > echo Mounting root filesystem. > mount /sysroot > echo Setting up other filesystems. > setuproot > echo Switching to new root and running init. > switchroot > echo Booting has failed. > sleep -1 > > Output of the Mount command: > [root@/] #mount > rootfs on / type rootfs (rw) > /dev/root on / type ext3 (rw,data=ordered) > /dev on /dev type tmpfs (rw) > /proc on /proc type proc (rw) > /sys on /sys type sysfs (rw) > /dev/sda1 on /boot type ext3 (rw,data=ordered) > tmpfs on /dev/shm type tmpfs (rw) > devpts on /dev/pts type devpts (rw) > > > Thanks > Rajeev Bansal > ******************************************************************************** This email message (including any attachments) is for the sole use of the intended recipient(s) and may contain confidential, proprietary and privileged information. 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