I purposefully modified grub.cfg and changed the UUID in the line starts with "linux /boot/vmlinuz...... root=UUID=XXXX" Ended up in the (initramfs) prompt because such partition is not present. Hence, I was thinking of checking CRC.
Thanks and Regards, Subbarao On Thu, Nov 20, 2014 at 10:53 PM, Andrei Borzenkov <arvidj...@gmail.com> wrote: > В Thu, 20 Nov 2014 19:08:10 +0530 > Venkata Subbarao <rao.subba.venk...@gmail.com> пишет: > > > Once again Thank you Andrei. > > Modified the grub source and added grub_exit (). After this BIOS booted > > from next device. > > > > I am now working on a solution where if the UUID present in the grub.cfg > > goes bad. > > One way I am thinking is to check the CRC of the grub.cfg and other image > > files required for booting. This may be bit lengthy. > > Let me know if you have suggestions. > > > > grub supports automatic signature verification for files; in case of > mismatch file open fails. Does it help? > > > Thanks, > > Subbarao > > > > On Wed, Nov 19, 2014 at 8:57 AM, Venkata Subbarao < > > rao.subba.venk...@gmail.com> wrote: > > > > > Thank you very much Andrei. > > > I will try out this and update. > > > > > > > > > - Subbarao > > > > > > On Wed, Nov 19, 2014 at 8:46 AM, Andrei Borzenkov <arvidj...@gmail.com > > > > > wrote: > > > > > >> В Tue, 18 Nov 2014 10:51:00 +0000 (UTC) > > >> Venkata Subbarao <rao.subba.venk...@gmail.com> пишет: > > >> > > >> > Hi All, > > >> > > > >> > I am working on a task on XUbuntu OS in which due to any reason if > > >> booting > > >> > fails I would like to switch to another boot device by zeroing the > MBR > > >> of > > >> > current boot disk. Is this possible ? > > >> > > > >> > For example instead of showing following prompt, I would like to > zero > > >> out > > >> > the MBR so that the BIOS can select next boot device upon reset. > > >> > > > >> > error: no such partition > > >> > grub rescue> > > >> > > > >> > > >> grub supports only very limited and controlled ways to write to > > >> device/file. Doing something like this in unattended manner is > probably > > >> way too dangerous. > > >> > > >> What would be possible is to optionally exit grub (after timeout) in > > >> this case; then BIOS should proceed to next boot device. > > >> > > > > > > > >
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