Add distinct strings to kernel config files to indicate BIOS type.

build_image

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # Script to build a bootable keyfob-based chromeos system image from within
 # a chromiumos setup. This assumes that all needed packages have been built into
 # the given target's root with binary packages turned on. This script will
 # build the Chrome OS image using only pre-built binary packages.
@@ skipping 335 matching lines @@
   sudo mkdir -p "$ROOT_FS_DIR"/boot
   # TODO(adlr): use initramfs for booting.
   cat <<EOF | sudo dd of="$ROOT_FS_DIR"/boot/extlinux.conf
 DEFAULT chromeos-usb
 PROMPT 0
 TIMEOUT 0
 
 label chromeos-usb
   menu label chromeos-usb
   kernel vmlinuz
-  append quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/sdb3 ro noresume noswap i915.modeset=1 loglevel=1
+  append quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/sdb3 ro noresume noswap i915.modeset=1 loglevel=1 cros_legacy
 
 label chromeos-hd
   menu label chromeos-hd
   kernel vmlinuz
-  append quiet console=tty2 init=/sbin/init boot=local rootwait root=HDROOT ro noresume noswap i915.modeset=1 loglevel=1
+  append quiet console=tty2 init=/sbin/init boot=local rootwait root=HDROOT ro noresume noswap i915.modeset=1 loglevel=1 cros_legacy
 EOF
 
   # Make partition bootable and label it.
   sudo extlinux -z --install "${ROOT_FS_DIR}/boot"
 fi
 
 # -- Install packages into the root file system --
 
 # We need to install libc manually from the cross toolchain.
 # TODO: Improve this? We only want libc and not the whole toolchain.
@@ skipping 69 matching lines @@
 sudo mkdir -p "${ESP_DIR}/efi/boot"
 sudo grub-mkimage -p /efi/boot -o "${ESP_DIR}/efi/boot/bootx64.efi" \
   part_gpt fat ext2 normal boot sh chain configfile linux
 cat <<'EOF' | sudo dd of="${ESP_DIR}/efi/boot/grub.cfg"
 set default=0
 set timeout=2
 
 # NOTE: These magic grub variables are a Chrome OS hack. They are not portable.
 
 menuentry "local image A" {
-  linux $grubpartA/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/$linuxpartA ro noresume noswap i915.modeset=1 loglevel=1
+  linux $grubpartA/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/$linuxpartA ro noresume noswap i915.modeset=1 loglevel=1 cros_efi
 }
 
 menuentry "local image B" {
-  linux $grubpartB/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/$linuxpartB ro noresume noswap i915.modeset=1 loglevel=1
+  linux $grubpartB/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/$linuxpartB ro noresume noswap i915.modeset=1 loglevel=1 cros_efi
 }
 
 menuentry "Alternate USB Boot" {
-  linux (hd0,3)/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/sdb3 ro noresume noswap i915.modeset=1 loglevel=1
+  linux (hd0,3)/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/sdb3 ro noresume noswap i915.modeset=1 loglevel=1 cros_efi
 }
 
 EOF
 
 # FIXME: At the moment, we're working on signed images for x86 only. ARM will
 # support this before shipping, but at the moment they don't.
 if [[ "$ARCH" = "x86" ]]; then
   
   # Legacy BIOS will use the kernel in the rootfs (via syslinux), as will
   # standard EFI BIOS (via grub, from the EFI System Partition). Chrome OS BIOS
   # will use a separate signed kernel partition, which we'll create now.
   # FIXME: remove serial output, debugging messages
   cat <<'EOF' > "${OUTPUT_DIR}/config.txt"
 earlyprintk=serial,ttyS0,115200
 console=ttyS0,115200
 init=/sbin/init
 add_efi_memmap
 boot=local
 rootwait
 root=/dev/sd%D%P
 ro
 noresume
 noswap
 i915.modeset=1
 loglevel=7
-Hi_Mom
+cros_secure
 EOF
   
   # FIXME: We need to specify the real keys and certs here!
   SIG_DIR="${SRC_ROOT}/platform/vboot_reference/tests/testkeys"
 
   # Wrap the public keys with VbPublicKey headers
   vbutil_key --pack \
     --in "${SIG_DIR}/key_rsa2048.keyb" \
     --version 1 --algorithm 4 \
     --out "${OUTPUT_DIR}/key_alg4.vbpubk"
@@ skipping 101 matching lines @@
   echo "Developer image created as $DEVELOPER_IMAGE_NAME"
 fi
 
 print_time_elapsed
 
 echo "To copy to USB keyfob, OUTSIDE the chroot, do something like:"
 echo "  ./image_to_usb.sh --from=${OUTSIDE_OUTPUT_DIR} --to=/dev/sdX"
 echo "To convert to VMWare image, OUTSIDE the chroot, do something like:"
 echo "  ./image_to_vmware.sh --from=${OUTSIDE_OUTPUT_DIR}"
 echo "from the scripts directory where you entered the chroot."