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Re: grub-probe seems to be having problems

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: grub-probe seems to be having problems
Date: Tue, 20 Mar 2012 20:10:12 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20120124 Icedove/9.0.1

On 20.03.2012 20:02, Lennart Sorensen wrote:
On Tue, Mar 20, 2012 at 11:28:18AM +0100, Vladimir 'φ-coder/phcoder' Serbinenko 
There is no need to debug. I know exactly why GRUB is confused:
because as far as my understanding goes the superblock makes no
sense (details in previous mail). What we need is that someone
familiar with md tells me how this sector should be interpreted.
This is just weird.

I run grub-probe and sometimes it works and sometimes it doesn't.

Something is giving inconsistent results.  I don't know if it is a
problem in 2.6.32 kernel returning inconsistent data for the superblock,
or if grub isn't correctly initializing the superblock before filling it,
or if grub isn't actually reading the superblock properly.
My conclusions are based on direct examination of the files you supplied not GRUB output.
Sometimes /dev/sdd2 isn't being recognized as a member of /dev/md0,
and other times it is.

By the way, the code in grub-install that tries to check if a PReP
partition is empty using 'cmp' doesn't work.  It always fails.
The suggestion it gives doesn't help.

Forcing the partition to contain an elf header makes grub-install happy,
but that's not so easy to do until you got grub already installed there.

Also a recent change to non powerpc ieee1275 in grub-install has broken
nvsetenv, since ofpath is no longer being set on powerpc.  So boot-device
isn't set anymore.  This worked a few weeks ago.
The change in question isn't "non-powerpc", quite the opposite, it was to fix the install on powerpc Mac. Just different vendors use different boot methods.
Please try this:
=== modified file 'util/'
--- util/    2012-03-10 11:33:52 +0000
+++ util/    2012-03-20 19:08:57 +0000
@@ -764,6 +764,12 @@
         echo "  dd if=/dev/zero of=${install_device}"
         exit 1
+        ofpath="`$ofpathname "${install_device}"`" || {
+        # TRANSLATORS: "device tree path" is the name of the device
+            # for IEEE1275
+ gettext_printf "Couldn't find IEEE1275 device tree path for %s.\nYou will have to set \`boot-device' variable manually.\n" "$dev" 1>&2
+        exit 1
+        }

     "$nvsetenv" boot-device "$boot_device" || {

Vladimir 'φ-coder/phcoder' Serbinenko

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