Here's a patch which adds --disk-module to grub-install for i386-pc to
make it easier for users to try out ata mod instead of biosdisk.
-- 
Felix Zielcke
2009-06-04  Felix Zielcke  <fziel...@z-51.de>

	* util/i386/pc/grub-install.in: Add a parameter --disk-module.

diff --git a/util/i386/pc/grub-install.in b/util/i386/pc/grub-install.in
index 468a72e..7033477 100644
--- a/util/i386/pc/grub-install.in
+++ b/util/i386/pc/grub-install.in
@@ -49,6 +49,12 @@ force_lba=
 recheck=no
 debug=no
 
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
+    disk_module=biosdisk
+else
+    disk_module=ata
+fi
+
 # Usage: usage
 # Print the usage.
 usage () {
@@ -68,6 +74,13 @@ Install GRUB on your drive.
   --no-floppy             do not probe any floppy drive
   --recheck               probe a device map even if it already exists
   --force                 install even if problems are detected
+EOF
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
+    cat <<EOF
+  --disk-module=MODULE    disk module to use
+EOF
+fi
+    cat <<EOF
 
 INSTALL_DEVICE can be a GRUB device name or a system device filename.
 
@@ -250,11 +263,7 @@ partmap_module=`$grub_probe --target=partmap --device ${grub_device} 2> /dev/nul
 devabstraction_module=`$grub_probe --target=abstraction --device ${grub_device}`
 
 # The order in this list is critical.  Be careful when modifying it.
-if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
-    modules="$modules biosdisk"
-else
-    modules="$modules ata"
-fi
+modules="$modules $disk_module"
 modules="$modules $fs_module $partmap_module $devabstraction_module"
 
 prefix_drive=
@@ -269,11 +278,11 @@ if [ "x${devabstraction_module}" = "x" ] ; then
     # Strip partition number
     install_drive="`echo ${install_drive} | sed -e s/,[0-9]*[a-z]*//g`"
     grub_drive="`echo ${grub_drive} | sed -e s/,[0-9]*[a-z]*//g`"
-    if [ "${target_cpu}-${platform}" != "i386-pc" ] ; then
-        # generic method (used on coreboot)
+    if [ "$disk_module" = ata ] ; then
+        # generic method (used on coreboot and ata mod)
         uuid="`$grub_probe --target=fs_uuid --device ${grub_device}`"
         if [ "x${uuid}" = "x" ] ; then
-          echo "UUID needed on this platform, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
+          echo "UUID needed on this platform and with ata mod, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
           exit 1
         fi
         prefix_drive="(UUID=${uuid})"
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