Add --bootargs option to build_image.

src/scripts/build_gpt.sh

 #!/bin/bash
 #
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Load functions and constants for chromeos-install
 . "$(dirname "$0")/chromeos-common.sh"
 
 # Script must be run inside the chroot.
 assert_inside_chroot
 
 get_default_board
 
 # Flags.
 DEFINE_string arch "" \
   "The target architecture (\"arm\" or \"x86\")."
 DEFINE_string board "$DEFAULT_BOARD" \
   "The board to build an image for."
+DEFINE_string arm_extra_bootargs "" \
+  "Additional command line options to pass to the ARM kernel."
 
 # Usage.
 FLAGS_HELP=$(cat <<EOF
 
 Usage: $(basename $0) [flags] IMAGEDIR OUTDEV
 
 This takes the image components in IMAGEDIR and creates a bootable,
 GPT-formatted image in OUTDEV. OUTDEV can be a file or block device.
 
 EOF
@@ skipping 73 matching lines @@
   PMBRCODE=$(readlink -f /usr/share/syslinux/gptmbr.bin)
 fi
 
 # Create the GPT. This has the side-effect of setting some global vars
 # describing the partition table entries (see the comments in the source).
 install_gpt $OUTDEV $ROOTFS_IMG $KERNEL_IMG $STATEFUL_IMG $PMBRCODE $ESP_IMG
 
 if [[ "$ARCH" = "arm" ]]; then
   # assume /dev/mmcblk1. we could not get this from ${OUTDEV}
   DEVICE=1
-  MBR_SCRIPT_UIMG=$(make_arm_mbr ${START_KERN_A} ${NUM_KERN_SECTORS} ${DEVICE})
+  MBR_SCRIPT_UIMG=$(make_arm_mbr \
+    ${START_KERN_A} \
+    ${NUM_KERN_SECTORS} \
+    ${DEVICE} \
+    "${FLAGS_arm_extra_bootargs}")
   sudo dd bs=1 count=`stat --printf="%s" ${MBR_SCRIPT_UIMG}` \
      if="$MBR_SCRIPT_UIMG" of=${OUTDEV} conv=notrunc
 fi
 
 # Emit helpful scripts for testers, etc.
 ${SCRIPTS_DIR}/emit_gpt_scripts.sh "${OUTDEV}" "${IMAGEDIR}"
 
 sudo=
 if [ ! -w "$OUTDEV" ] ; then
   # use sudo when writing to a block device.
@@ skipping 11 matching lines @@
 echo "Copying rootfs..."
 $sudo dd if=${ROOTFS_IMG} of=${OUTDEV} conv=notrunc bs=512 seek=${START_ROOTFS_A}
 
 echo "Copying EFI system partition..."
 $sudo dd if=${ESP_IMG} of=${OUTDEV} conv=notrunc bs=512 seek=${START_ESP}
 
 # Clean up temporary files.
 if [[ -n "${MBR_IMG:-}" ]]; then
   rm "${MBR_IMG}"
 fi