[PATCH] grub-install on coreboot

[Robert Millan <rmh@aybabtu.com>]

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Hi,

This patch implements grub-install on coreboot.  Since there's no pre-defined
boot protocol on this platform, we simply generate a usable Multiboot image
and dump it to /boot.  User can afterwards load it to flash to make the board
boot using this disk, or load it from elsewhere (even from a BIOS rescue disk).

I hope it's not too intrusive to reuse i386-pc's grub-install;  I think it's
much better than duplicating the whole script.

Note: indentation changes intentionally ommitted to improve readability.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

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2008-11-22  Robert Millan  <rmh@aybabtu.com>

	* conf/i386-coreboot.rmk (sbin_SCRIPTS): Add `grub-install'.
	(grub_install_SOURCES): New variable.
	* util/i386/pc/grub-install.in: Add a few condition checks to make it
	usable on coreboot.

Index: conf/i386-coreboot.rmk
===================================================================
--- conf/i386-coreboot.rmk	(revision 1926)
+++ conf/i386-coreboot.rmk	(working copy)
@@ -90,6 +90,9 @@ grub_emu_SOURCES = commands/boot.c comma
 
 grub_emu_LDFLAGS = $(LIBCURSES)
 
+sbin_SCRIPTS += grub-install
+grub_install_SOURCES = util/i386/pc/grub-install.in
+
 # Modules.
 pkglib_MODULES = _linux.mod linux.mod normal.mod	\
 	_multiboot.mod multiboot.mod aout.mod		\
Index: util/i386/pc/grub-install.in
===================================================================
--- util/i386/pc/grub-install.in	(revision 1926)
+++ util/i386/pc/grub-install.in	(working copy)
@@ -32,7 +32,11 @@ platform=@platform@
 pkglibdir=${libdir}/`echo ${PACKAGE_TARNAME}/${target_cpu}-${platform} | sed ${transform}`
 
 grub_setup=${sbindir}/`echo grub-setup | sed ${transform}`
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
 grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`
+else
+grub_mkimage=${bindir}/`echo grub-mkelfimage | sed ${transform}`
+fi
 grub_mkdevicemap=${sbindir}/`echo grub-mkdevicemap | sed ${transform}`
 grub_probe=${sbindir}/`echo grub-probe | sed ${transform}`
 rootdir=
@@ -152,6 +156,7 @@ device_map=${grubdir}/device.map
 
 grub_probe="${grub_probe} --device-map=${device_map}"
 
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
 # Check if GRUB is installed.
 set $grub_setup dummy
 if test -f "$1"; then
@@ -160,6 +165,7 @@ else
     echo "$1: Not found." 1>&2
     exit 1
 fi
+fi
 
 set $grub_mkimage dummy
 if test -f "$1"; then
@@ -210,9 +216,14 @@ for file in ${grubdir}/*.mod ${grubdir}/
 	rm -f $file || exit 1
     fi
 done
-for file in ${pkglibdir}/*.mod ${pkglibdir}/*.lst ${pkglibdir}/*.img; do
+for file in ${pkglibdir}/*.mod ${pkglibdir}/*.lst; do
+    cp -f $file ${grubdir} || exit 1
+done
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
+for file in ${pkglibdir}/*.img; do
     cp -f $file ${grubdir} || exit 1
 done
+fi
 
 # Write device to a variable so we don't have to traverse /dev every time.
 grub_device=`$grub_probe --target=device ${grubdir}`
@@ -234,7 +245,12 @@ partmap_module=`$grub_probe --target=par
 devabstraction_module=`$grub_probe --target=abstraction --device ${grub_device}`
 
 # The order in this list is critical.  Be careful when modifying it.
-modules="$modules $fs_module $partmap_module biosdisk $devabstraction_module"
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
+  modules="$modules biosdisk"
+else
+  modules="$modules ata"
+fi
+modules="$modules $fs_module $partmap_module $devabstraction_module"
 
 prefix_drive=
 if [ "x${devabstraction_module}" = "x" ] ; then
@@ -248,7 +264,16 @@ if [ "x${devabstraction_module}" = "x" ]
     # Strip partition number
     install_drive="`echo ${install_drive} | sed -e s/,[0-9]*//g`"
     grub_drive="`echo ${grub_drive} | sed -e s/,[0-9]*//g`"
-    if [ "x${grub_drive}" != "x${install_drive}" ] ; then
+    if [ "${target_cpu}-${platform}" != "i386-pc" ] ; then
+        # generic method (used on coreboot)
+        uuid="`$grub_probe --target=fs_uuid --device ${grub_device}`"
+        if [ "x${uuid}" = "x" ] ; then
+          echo "UUID needed on this platform, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
+          exit 1
+        fi
+        prefix_drive="(UUID=${uuid})"
+        modules="$modules fs_uuid"
+    elif [ "x${grub_drive}" != "x${install_drive}" ] ; then
         uuid="`$grub_probe --target=fs_uuid --device ${grub_device}`"
         if [ "x${uuid}" = "x" ] ; then
           echo "You attempted a cross-disk install, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
@@ -266,12 +291,20 @@ if [ "x${relative_grubdir}" = "x" ] ; th
     relative_grubdir=/
 fi
 
+if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
+
 $grub_mkimage --output=${grubdir}/core.img --prefix=${prefix_drive}${relative_grubdir} $modules || exit 1
 
 # Now perform the installation.
 $grub_setup ${setup_verbose} --directory=${grubdir} --device-map=${device_map} \
     ${install_device} || exit 1
 
+else
+
+$grub_mkimage -d ${pkglibdir} --output=/boot/multiboot.img --prefix=${prefix_drive}${relative_grubdir} $modules || exit 1
+
+fi
+
 # Prompt the user to check if the device map is correct.
 echo "Installation finished. No error reported."
 echo "This is the contents of the device map $device_map."