No initrd is required. /dev/sda1 is discovered at kernel boot time.
then "mount /" is done. If everything is builtin, it's fine.
I tested it with lenny rootdisk.
Regards,
Matt
j.chitte wrote:
>
>
> --- In <ts-7000%40yahoogroups.com>,
> Matthieu Crapet <> wrote:
> >
> > Hi,
> >
> > Make sure that your kernel has buildin : usb + usb-storage + fs ext2/3.
> >
> > RedBoot> load -r -b 0x00218000 -h 192.168.1.48 zImage
> > RedBoot> exec -c "console=ttyAM0,115200 root=/dev/sda1 rootwait"
> >
> > The "rootwait" is important because the /dev/sda1 (which is your usbkey
> > is not discovered yet).
> >
> > I have made recently a debian rootdisk (eabi) for somebody. It's basic
> > 144mo.
> > http://mcrapet.free.fr/tmp/nfsroot-lenny-20090508.tar.bz2
> <http://mcrapet.free.fr/tmp/nfsroot-lenny-20090508.tar.bz2>
> > Hope it can help.
> >
> > Regards,
> > Matthieu
> >
> >
>
> Isn't it necessary to provide an initrd with a basic /dev structure ?
>
> Thanks for that image , it could be a useful test tool.
>
> regards.
>
> > 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 <ts-7000%40yahoogroups.com>
> <ts-7000%40yahoogroups.com>,
> > > 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
> > > >
> > >
> > >
> >
>
>
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