--- In "j.chitte" <> wrote:
>
> --- In "s.magda@" <msanchez@> wrote:
> >
> >
> > I am trying to boot from a USB key by running the following command:
> >
> > exec -c "console=ttyAM0,115200 root=/dev/sda1"
> >
> > and my error message is:
> >
> > "VFS: Unable to mount root fs via NFS, trying floppy.
> > VFS: Cannot open root device sda1 or unknown-block (2,0)
> > Please append a correct "root=" boot option: here are the available
> > partitions:
> > kernel panic - not syncing: VFS: unable to mount root fs on unknown-block
> > (2,0)"
> >
> > I've created a ext2 partition on sda1 with the debian system on it by
> > executing:
> > > fdisk /dev/sda1
> > >mkfs.ext2 /dev/sda1
> > >mount /dev/sda1 /mnt
> > >tar -C /mnt -xf ./debian-sarge-udev-19-05-2009_backup.tgz
> > >fsck /dev/sda1
> >
> > I wonder if there is something that I have to activate on my kernel
> > configuration to enable booting from USB flash, I am using 2.6.27.4 vanilla
> > kernel with Matt's patches.
> >
> >
> > Thanks a million,
> >
> > Magda
> >
> > -
> > -- In Jason Stahls <jason@> wrote:
> > >
> > > s.magda@ wrote:
> > > > I have the exact same problem!
> > > >
> > > > Can anyone help?
> > >
> > > What command line in Redboot are you guys using, and where are you
> > > trying to boot from?
> > >
> > > This,
> > >
> > > Root-NFS: No NFS server available, giving up.
> > > > VFS: Unable to mount root fs via NFS, trying floppy.
> > > > VFS: Cannot open root device "usb0" or unknown-block(2,0)
> > > > Please append a correct "root=" boot option
> > > > Kernel panic - not syncing: VFS: Unable to mount root fs on
> > > > unknown-block(2,0)
> > >
> > >
> > > Tells you that it was unable to mount the root FS, this is passed to the
> > > kernel from reboot as root=
> > >
> > > --
> > > Jason Stahls
> > >
> >
>
> Also how will your kernel know about /dev/sda11 before it has loaded the fs ?!
That's a good question.
>
> AFASK redboot is not usb aware it can only load a root fs on yaffs.
>
> You'll need to look at how TS do it in the scripts they provide to boot USB
> in TSlinux. It boots to yaafs then loads the drivers and does a switch to USB
> fs. Probably a chroot of pivot.
>
> It's in the TS doc.
>
I don't get it, then is it not possible to boot from a usb stick the same way
as for a NFS server or tftp?
thanks
Magda
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