Enable boot.img creation
In order to build a boot.img, the following build variables
need to be defined in the build.config file:
As we finalize where all the prebuilts will get delivered to,
some of the below may become unnecessary.
BUILD_BOOT_IMG=1
MKBOOTIMG_PREBUILT=<path to mkbootimg.py>
GKI_RAMDISK_PREBUILT_BINARY=<path to GKI ramdisk prebuilt>
VENDOR_RAMDISK_PREBUILT_BINARY=<path to vendor ramdisk prebuilt>
KERNEL_BINARY=<name of kernel file, eg. Image.lz4, Image.gz etc>
BOOT_IMAGE_HEADER_VERSION=<boot image header version>
Change-Id: I191c39911b53cef17c01bd4adb8dd4f5a2e17aee
diff --git a/build.sh b/build.sh
index 7b9bc6f..f1dfd75 100755
--- a/build.sh
+++ b/build.sh
@@ -83,6 +83,26 @@
# SKIP_CP_KERNEL_HDR
# if defined, skip installing kernel headers.
#
+# BUILD_BOOT_IMG
+# if defined, build a boot.img binary that can be flashed into the 'boot'
+# partition of an Android device. The boot image contains a header as per the
+# format defined by https://source.android.com/devices/bootloader/boot-image-header
+# followed by several components like kernel, ramdisk, DTB etc. The ramdisk
+# component comprises of a GKI ramdisk cpio archive concatenated with a
+# vendor ramdisk cpio archive which is then gzipped. It is expected that
+# all components are present in ${DIST_DIR}.
+#
+# When the BUILD_BOOT_IMG flag is defined, the following flags that point to the
+# various components needed to build a boot.img also need to be defined.
+# - MKBOOTIMG_PATH=<path to the mkbootimg.py script which builds boot.img>
+# - GKI_RAMDISK_PREBUILT_BINARY=<Name of the GKI ramdisk prebuilt which includes
+# the generic ramdisk components like init and the non-device-specific rc files>
+# - VENDOR_RAMDISK_BINARY=<Name of the vendor ramdisk binary which includes the
+# device-specific components of ramdisk like the fstab file and the
+# device-specific rc files.>
+# - KERNEL_BINARY=<name of kernel binary, eg. Image.lz4, Image.gz etc>
+# - BOOT_IMAGE_HEADER_VERSION=<version of the boot image header>
+#
# Note: For historic reasons, internally, OUT_DIR will be copied into
# COMMON_OUT_DIR, and OUT_DIR will be then set to
# ${COMMON_OUT_DIR}/${KERNEL_DIR}. This has been done to accommodate existing
@@ -331,6 +351,56 @@
echo "========================================================"
echo " Files copied to ${DIST_DIR}"
+if [ ! -z "${BUILD_BOOT_IMG}" ] ; then
+
+ DTB_FILE_LIST=$(find ${DIST_DIR} -name "*.dtb")
+ if [ -z "${DTB_FILE_LIST}" ]; then
+ echo "No *.dtb files found in ${DIST_DIR}"
+ exit 1
+ fi
+ cat $DTB_FILE_LIST > ${DIST_DIR}/dtb.img
+
+ if [ ! -f "${DIST_DIR}/$GKI_RAMDISK_PREBUILT_BINARY" ]; then
+ echo "GKI ramdisk prebuilt binary" \
+ "(GKI_RAMDISK_PREBUILT_BINARY = $GKI_RAMDISK_PREBUILT_BINARY)" \
+ "not present in ${DIST_DIR}"
+ exit 1
+ fi
+ if [ ! -f "${DIST_DIR}/$VENDOR_RAMDISK_BINARY" ]; then
+ echo "vendor ramdisk binary(VENDOR_RAMDISK_BINARY = $VENDOR_RAMDISK_BINARY)" \
+ "not present in ${DIST_DIR}"
+ exit 1
+ fi
+
+ cat ${DIST_DIR}/$GKI_RAMDISK_PREBUILT_BINARY ${DIST_DIR}/$VENDOR_RAMDISK_BINARY \
+ > ${DIST_DIR}/ramdisk.cpio
+ gzip -f ${DIST_DIR}/ramdisk.cpio > ${DIST_DIR}/ramdisk
+
+ if [ ! -x "$MKBOOTIMG_PATH" ]; then
+ echo "mkbootimg.py script not found or not executable. MKBOOTIMG_PATH = $MKBOOTIMG_PATH"
+ exit 1
+ fi
+
+ if [ ! -f "${DIST_DIR}/$KERNEL_BINARY" ]; then
+ echo "kernel binary(KERNEL_BINARY = $KERNEL_BINARY) not present in ${DIST_DIR}"
+ exit 1
+ fi
+
+ if [ -z "${BOOT_IMAGE_HEADER_VERSION}" ]; then
+ echo "BOOT_IMAGE_HEADER_VERSION must specify the boot image header version"
+ exit 1
+ fi
+
+ (set -x; $MKBOOTIMG_PATH --kernel ${DIST_DIR}/$KERNEL_BINARY \
+ --ramdisk ${DIST_DIR}/ramdisk \
+ --dtb ${DIST_DIR}/dtb.img --header_version $BOOT_IMAGE_HEADER_VERSION \
+ -o ${DIST_DIR}/boot.img
+ )
+ set +x
+ echo "boot image created at ${DIST_DIR}/boot.img"
+fi
+
+
# No trace_printk use on build server build
if readelf -a ${DIST_DIR}/vmlinux 2>&1 | grep -q trace_printk_fmt; then
echo "========================================================"
