On Sat September 3 2005 20:12, Ken Bloom wrote: > On 9/3/05, Wayne Watson <[EMAIL PROTECTED]> wrote: > > This is a redhat related problem. Redhat installed > > and works fine. The install process set up grub. > > Now I have built a new kernel from the tar ball and > > need to boot it. I put a new stanza in /boot/grub/menu.lst > > with the new kernel name and a new name for the stanza. > > The redhat installed line has > > kernel vmlinuz-2.4.20-6 ro root=LABEL=/1 > > so I used > > kernel vmlinuz-2.4.20-rtl3.2-pre2 ro root=LABEL=/1 > > > > the boot fails unable to open root > > I've tried using root=(hd1,0) which is my understanding > > of device numbering for grub but it still fails. Same error. > > > > I can't find any explanation of "LABEL" in menu.lst > > or for the /1 notation. > > Note I did make an initrd iamge with the command > > mkinitrd initrd-2.4.20.rtl3.2-pre2.img 2.4.20-rtl3.2-pre2 > > > > 2.4.20-rtl3.2-pre2 is the version as it appears in /lib/modules > > and the size of the image file is close to that of the oringinal > > redhat initrd image. > > > > Can anybody clue me as to what I need in grub/menu.lst?? > > Here is an example stanza from my kubuntu /boot/grub/menu.lst > > title Ubuntu, kernel 2.6.10-5-386 (recovery mode) > root (hd0,0) > kernel /boot/vmlinuz-2.6.10-5-386 root=/dev/hda1 ro noapic > acpi_sleep=s3_bios single > initrd /boot/initrd.img-2.6.10-5-386 > savedefault > boot > > Explanation: the first line is the title in the grub menu. The second > line tells GRUB (but not the kernel) where it can find the partition > with your kernel on it. If you don't have a separate /boot partition, > then your configuration should look like mine. /dev/hda1 corresponds > to (hd0,0) If you do have a separate /boot partition, then you should > have the root line correspond to that, and your kernel and initrd > lines should not contain the /boot. > > on the third line (the one starting "kernel") the root= option tells > your kernel where it can find the / partition. the root=LABEL=/1 is > just another way of specifying this without having to specify it > physically, if you take advantage of partition labelling (it seems > that fedora does by default) > > the initrd line seems to be the magic line that you'e missing from > your stanza for this kernel. > This problem is now solved. I was helping Wayne get rtlinux installed. The solution was to use root=/dev/hdb1 in the kernel line in place of the LABEL construct. Changed this in both stanzas and in fstab. I don't understand why the LABEL construct worked for the redhat installed kernel and not for the rtlinux kernel. As I understand it, the LABEL construct allows grub to search for the right partition which is supposed to make it more robust to hardware re-configuration. Maybe the rtlinux patches to the kernel broke something needed for the LABEL construct to work. I definetely had the initrd line in the stanza.
Richard Harke _______________________________________________ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
