[bug #39750] Booting from syslinux via lnxboot no longer figures out root partition

[Josh Triplett]

URL:
  <http://savannah.gnu.org/bugs/?39750>

                 Summary: Booting from syslinux via lnxboot no longer figures
out root partition
                 Project: GNU GRUB
            Submitted by: joshtriplett
            Submitted on: Sat 10 Aug 2013 11:24:27 PM PDT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Bazaar - trunk
         Reproducibility: Every Time
         Planned Release: None

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Details:

When booting a grub image from syslinux via lnxboot on a partitioned disk,
grub used to properly detect the root filesystem, and thus find its modules
and config file.  Current versions of grub have broken this, and no longer
detect the partition; grub looks for its files on (hd0)/boot/grub rather than
(hd0,1)/boot/grub, which won't work on a partitioned disk.

It looks like this change occurred in bzr revno 3592, on the assumption that
the only way the partition number would be set is via the archaic "setdevice"
command (run on a Linux kernel image before booting it).  However, that same
mechanism is also used by other bootloaders that know how to boot a Linux
kernel image, such as syslinux.

Please consider re-adding this functionality.




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