Support booting from non zero MMC device numbers

build_kernel_image.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.
 
 # Helper script that generates the signed kernel image
 
 . "$(dirname "$0")/common.sh"
 
@@ skipping 202 matching lines @@
   kernel_image="${FLAGS_vmlinuz/vmlinuz/vmlinux.uimg}"
   WORK="${WORK} ${kernel_script} ${kernel_script_img}"
 
   kernel_size=$((($(stat -c %s "${kernel_image}") + 511) / 512))
   script_size=16
 
   # Build boot script image
   echo -n 'setenv bootargs ${bootargs} ' > "${kernel_script}"
   tr '\n' ' ' <"${FLAGS_working_dir}/boot.config" >> "${kernel_script}"
   echo >> "${kernel_script}"
-  printf 'read ${devtype} 0:${kernelpart} ${loadaddr} %x %x\n' \
+  printf 'read ${devtype} ${devnum}:${kernelpart} ${loadaddr} %x %x\n' \
     ${script_size} ${kernel_size} >> "${kernel_script}"
   echo 'bootm ${loadaddr}' >> ${kernel_script}
   mkimage -A arm -O linux -T script -C none -a 0 -e 0 \
     -n kernel_script -d "${kernel_script}" "${kernel_script_img}"
 
   if [ $(stat -c %s "${kernel_script_img}") -gt $((512 * ${script_size})) ]
   then
     echo 'Kernel script too large for reserved space.'
     exit 1
   fi
@@ skipping 17 matching lines @@
   info "Cleaning up temporary files: ${WORK}"
   rm ${WORK}
   rmdir ${FLAGS_working_dir}
 fi
 
 info "Kernel partition image emitted: ${FLAGS_to}"
 
 if [[ -f ${FLAGS_rootfs_hash} ]]; then
   info "Root filesystem hash emitted: ${FLAGS_rootfs_hash}"
 fi