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elomaniak
n00b
Joined: 27 Jan 2013
Posts: 47
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 Posted: Tue Apr 02, 2013 1:41 pm Post subject: "Cannot open root device" when booting from PXE |
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Hi Folks i finally managed to get the kernel loading for my PXE Boot experiment/research
I am now getting a kernel panic while booting
here's the exact message
| Code: | VFS: Cannot open root device "nfs" or unknown block (0,255)
please append a correct "root=" boot option; hera are the available options
Kernel panic - not syncing VFS: unable to mount root fs on unknown block (0,255)
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heres my /diskless/pxelinux.cfg/default
| Code: |
DEFAULT Ubuntu test
LABEL Ubuntu test
kernel /client1/ubuntu/casper/vmlinuz
append root=/dev/nfs nfsroot=192.168.0.1:/diskless/client1/ubuntu ip=dhcp
initrd=/diskless/client1/ubuntu/initrd.lz quiet splash --
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fstab
| Code: |
# <fs> <mountpoint> <type> <opts> <dump/pass>
/dev/sda1 / reiserfs noatime0 1
#/dev/SWAP none swap sw 0 0
/dev/sr0 /mnt/cdrom auto noauto,ro 0 0
/diskless/ubuntu.iso /diskless/client1/ubuntu auto defaults,loop,user 0 0
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/etc/exports
| Code: | # /etc/exports: NFS file systems being exported. See exports(5).
/diskless/client1/ubuntu/ *(ro,sync,no_wdelay,insecure_locks,no_root_squash,insecure)
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for me it seems to be ok, I am trying to figure it our for about two hours without any luck
maybe someone can suggest something that might help
Thanks in advance |
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honp
Guru
Joined: 25 Sep 2006
Posts: 355
Location: Good old Prague, Czech rep.
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| Posted: Wed Apr 03, 2013 9:07 am Post subject: |
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Can your kernel do this?
- NFS filesystem support (CONFIG_NFS_FS).
- Root file system on NFS (CONFIG_ROOT_NFS). |
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elomaniak
n00b
Joined: 27 Jan 2013
Posts: 47
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| Posted: Thu Apr 04, 2013 8:25 am Post subject: |
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CONFIG_NFS_FS=m
cant find CONFIG_ROOT_NFS in my .config
EDIT: found it, dependencies showed i had to build in CONFIG_NFS_FS=y
will check and report later |
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honp
Guru
Joined: 25 Sep 2006
Posts: 355
Location: Good old Prague, Czech rep.
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| Posted: Thu Apr 04, 2013 10:04 am Post subject: |
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| Yes, modul is not enough, or you must use initrd somehow... |
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