--- a/util/grub.d/10_linux.in	2021-06-17 03:06:45.912081000 -0500
+++ b/util/grub.d/10_linux.in	2021-06-17 13:39:03.509682976 -0500
@@ -91,10 +91,14 @@
   fi
   if [ x$type != xsimple ] ; then
       case $type in
+	  booster)
+	      title="$(gettext_printf "%s, %s kernel (booster initramfs)" "${os}" "${version}")" ;;
+	  fallback)
+	      title="$(gettext_printf "%s, %s kernel (fallback initramfs)" "${os}" "${version}")" ;;
 	  recovery)
-	      title="$(gettext_printf "%s, with Linux %s (recovery mode)" "${os}" "${version}")" ;;
+	      title="$(gettext_printf "%s, %s kernel (recovery mode)" "${os}" "${version}")" ;;
 	  *)
-	      title="$(gettext_printf "%s, with Linux %s" "${os}" "${version}")" ;;
+	      title="$(gettext_printf "%s, %s kernel" "${os}" "${version}")" ;;
       esac
       if [ x"$title" = x"$GRUB_ACTUAL_DEFAULT" ] || [ x"Previous Linux versions>$title" = x"$GRUB_ACTUAL_DEFAULT" ]; then
 	  replacement_title="$(echo "Advanced options for ${OS}" | sed 's,>,>>,g')>$(echo "$title" | sed 's,>,>>,g')"
@@ -106,7 +110,7 @@
   else
       echo "menuentry '$(echo "$os" | grub_quote)' ${CLASS} \$menuentry_id_option 'gnulinux-simple-$boot_device_id' {" | sed "s/^/$submenu_indentation/"
   fi      
-  if [ x$type != xrecovery ] ; then
+  if [ x$type != xrecovery ] && [ x$type != xfallback ] ; then
       save_default_entry | grub_add_tab
   fi
 
@@ -138,7 +142,7 @@
     fi
     printf '%s\n' "${prepare_boot_cache}" | sed "s/^/$submenu_indentation/"
   fi
-  message="$(gettext_printf "Loading Linux %s ..." ${version})"
+  message="$(gettext_printf "Loading %s kernel ..." ${version})"
   sed "s/^/$submenu_indentation/" << EOF
 	echo	'$(echo "$message" | grub_quote)'
 	linux	${rel_dirname}/${basename} root=${linux_root_device_thisversion} ro ${args}
@@ -198,7 +202,7 @@
   basename=`basename $linux`
   dirname=`dirname $linux`
   rel_dirname=`make_system_path_relative_to_its_root $dirname`
-  version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`
+  version=`echo $basename | sed -e "s,vmlinuz-,,g"`
   alt_version=`echo $version | sed -e "s,\.old$,,g"`
   linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
 
@@ -285,6 +289,29 @@
 
   linux_entry "${OS}" "${version}" advanced \
               "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
+
+  if test -e "${dirname}/initramfs-${version}-fallback.img" ; then
+    initrd="${initrd_early} initramfs-${version}-fallback.img"
+
+    if test -n "${initrd}" ; then
+      gettext_printf "Found fallback initramfs image: %s\n" "${dirname}/${initrd}" >&2
+    fi
+
+    linux_entry "${OS}" "${version}" fallback \
+                "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
+  fi
+
+  if test -e "${dirname}/booster-${version}.img" ; then
+    initrd="${initrd_early} booster-${version}.img"
+
+    if test -n "${initrd}" ; then
+      gettext_printf "Found booster initrd image(s) in %s:%s\n" "${dirname}" "${initrd_extra} ${initrd}" >&2
+    fi
+
+    linux_entry "${OS}" "${version}" booster \
+                "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
+  fi
+
   if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
     linux_entry "${OS}" "${version}" recovery \
                 "single ${GRUB_CMDLINE_LINUX}"
--- a/util/grub.d/20_linux_xen.in	2021-06-17 03:06:56.202081000 -0500
+++ b/util/grub.d/20_linux_xen.in	2021-06-17 03:22:43.732079272 -0500
@@ -117,9 +117,11 @@
   fi
   if [ x$type != xsimple ] ; then
       if [ x$type = xrecovery ] ; then
-	  title="$(gettext_printf "%s, with Xen %s and Linux %s (recovery mode)" "${os}" "${xen_version}" "${version}")"
+	  title="$(gettext_printf "%s, with Xen %s and %s kernel (recovery mode)" "${os}" "${xen_version}" "${version}")"
+      elif [ x$type = xfallback ] ; then
+	  title="$(gettext_printf "%s, with Xen %s and %s kernel (fallback initramfs)" "${os}" "${xen_version}" "${version}")"
       else
-	  title="$(gettext_printf "%s, with Xen %s and Linux %s" "${os}" "${xen_version}" "${version}")"
+	  title="$(gettext_printf "%s, with Xen %s and %s kernel" "${os}" "${xen_version}" "${version}")"
       fi
       replacement_title="$(echo "Advanced options for ${OS}" | sed 's,>,>>,g')>$(echo "$title" | sed 's,>,>>,g')"
       if [ x"Xen ${xen_version}>$title" = x"$GRUB_ACTUAL_DEFAULT" ]; then
@@ -132,7 +134,7 @@
       title="$(gettext_printf "%s, with Xen hypervisor" "${os}")"
       echo "menuentry '$(echo "$title" | grub_quote)' ${CLASS} \$menuentry_id_option 'xen-gnulinux-simple-$boot_device_id' {" | sed "s/^/$submenu_indentation/"
   fi
-  if [ x$type != xrecovery ] ; then
+  if [ x$type != xrecovery ] && [ x$type != xfallback ] ; then
       save_default_entry | grub_add_tab | sed "s/^/$submenu_indentation/"
   fi
 
@@ -141,7 +143,7 @@
   fi
   printf '%s\n' "${prepare_boot_cache}" | sed "s/^/$submenu_indentation/"
   xmessage="$(gettext_printf "Loading Xen %s ..." ${xen_version})"
-  lmessage="$(gettext_printf "Loading Linux %s ..." ${version})"
+  lmessage="$(gettext_printf "Loading %s kernel ..." ${version})"
   sed "s/^/$submenu_indentation/" << EOF
 	echo	'$(echo "$xmessage" | grub_quote)'
         if [ "\$grub_platform" = "pc" -o "\$grub_platform" = "" ]; then
@@ -275,7 +277,7 @@
 	basename=`basename $linux`
 	dirname=`dirname $linux`
 	rel_dirname=`make_system_path_relative_to_its_root $dirname`
-	version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`
+	version=`echo $basename | sed -e "s,vmlinuz-,,g"`
 	alt_version=`echo $version | sed -e "s,\.old$,,g"`
 	linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
 
@@ -341,6 +343,18 @@
 
 	linux_entry "${OS}" "${version}" "${xen_version}" advanced \
 	    "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
+
+	if test -e "${dirname}/initramfs-${version}-fallback.img" ; then
+	    initrd="initramfs-${version}-fallback.img"
+
+	    if test -n "${initrd}" ; then
+	        gettext_printf "Found fallback initramfs image: %s\n" "${dirname}/${initrd}" >&2
+	    fi
+
+	    linux_entry "${OS}" "${version}" "${xen_version}" fallback \
+	        "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
+	fi
+
 	if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
 	    linux_entry "${OS}" "${version}" "${xen_version}" recovery \
 		"single ${GRUB_CMDLINE_LINUX}" "${GRUB_CMDLINE_XEN}"