[PATCH 4/5] update_bootloaders.sh, create_esp.sh: add two helpers

create_esp.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.
+
+# Creates an empty ESP image.
+
+. "$(dirname "$0")/common.sh"
+
+get_default_board
+
+# Flags.
+DEFINE_string to "/tmp/esp.img" \
+  "Path to esp image (Default: /tmp/esp.img)"
+
+# Parse flags
+FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
+set -e
+
+if [[ -e "${FLAGS_to}" ]]; then
+  info "ESP already exists: ${FLAGS_to}"
+  exit 0
+fi
+
+info "Creating a new esp image at ${FLAGS_to}" anyway.
+# Create EFI System Partition to boot stock EFI BIOS (but not ChromeOS EFI
+# BIOS). We only need this for x86, but it's simpler and safer to keep the
+# disk images the same for both x86 and ARM.
+# NOTE: The size argument for mkfs.vfat is in 1024-byte blocks.
+# We'll hard-code it to 16M for now.
+ESP_BLOCKS=16384
+/usr/sbin/mkfs.vfat -C "${FLAGS_to}" ${ESP_BLOCKS}