Added --wrap-initrd option

This is useful in combination the u-boot bootloader which can only
load wrap initramfs.

Signed-off-by: Christoph Junghans <ottxor@gentoo.org>

5 files changed, 24 insertions, 0 deletions

diff --git a/doc/genkernel.8.txt b/doc/genkernel.8.txt
index b36b78d..f8d7a10 100644
--- a/doc/genkernel.8.txt
+++ b/doc/genkernel.8.txt
@@ -376,6 +376,11 @@ OUTPUT SETTINGS
 	Builds or does not build the generated initramfs into the kernel instead
 	of keeping it as a separate file.
 
+*--*[*no-*]*wrap-initrd*::
+  	Wrap initramfs using mkimage for u-boot boots. Please note that only 
+	certain compression types are supported by mkimage (see manpage).
+
+
 *--*[*no-*]*compress-initramfs*, *--*[*no-*]*compress-initrd*::
 	Compresses or does not compress the generated initramfs.
 
diff --git a/gen_cmdline.sh b/gen_cmdline.sh
index 6ef6ae0..baa58fa 100755
--- a/gen_cmdline.sh
+++ b/gen_cmdline.sh
@@ -158,6 +158,8 @@ longusage() {
   echo "	--integrated-initramfs, --no-integrated-initramfs"
   echo "				Include/exclude the generated initramfs in the kernel"
   echo "				instead of keeping it as a separate file"
+  echo "	--wrap-initrd, --no-wrap-initrd"
+  echo "				Wrap initramfs using mkimage for u-boot boots"
   echo "	--compress-initramfs, --no-compress-initramfs,"
   echo "	--compress-initrd, --no-compress-initrd"
   echo "				Compress or do not compress the generated initramfs"
@@ -575,6 +577,10 @@ parse_cmdline() {
 			CMD_INTEGRATED_INITRAMFS=`parse_optbool "$*"`
 			print_info 2 "CMD_INTEGRATED_INITRAMFS=${CMD_INTEGRATED_INITRAMFS}"
 			;;
+		--wrap-initrd|--no-wrap-initrd)
+			CMD_WRAP_INITRD=`parse_optbool "$*"`
+			print_info 2 "CMD_WRAP_INITRD=${CMD_WRAP_INITRD}"
+			;;
 		--compress-initramfs|--no-compress-initramfs|--compress-initrd|--no-compress-initrd)
 			CMD_COMPRESS_INITRD=`parse_optbool "$*"`
 			print_info 2 "CMD_COMPRESS_INITRD=${CMD_COMPRESS_INITRD}"
diff --git a/gen_determineargs.sh b/gen_determineargs.sh
index dc6b2c4..59af78b 100755
--- a/gen_determineargs.sh
+++ b/gen_determineargs.sh
@@ -131,6 +131,7 @@ determine_real_args() {
 	set_config_with_override STRING FIRMWARE_DIR         CMD_FIRMWARE_DIR         "/lib/firmware"
 	set_config_with_override STRING FIRMWARE_FILES       CMD_FIRMWARE_FILES
 	set_config_with_override BOOL   INTEGRATED_INITRAMFS CMD_INTEGRATED_INITRAMFS
+	set_config_with_override BOOL   WRAP_INITRD          CMD_WRAP_INITRD
 	set_config_with_override BOOL   GENZIMAGE            CMD_GENZIMAGE
 	set_config_with_override BOOL   KEYMAP               CMD_KEYMAP               "yes"
 	set_config_with_override BOOL   DOKEYMAPAUTO         CMD_DOKEYMAPAUTO
diff --git a/gen_initramfs.sh b/gen_initramfs.sh
index b9ff518..254f21a 100755
--- a/gen_initramfs.sh
+++ b/gen_initramfs.sh
@@ -958,6 +958,16 @@ create_initramfs() {
 				print_info 1 "        >> Not compressing cpio data ..."
 			fi
 		fi
+		if isTrue "${WRAP_INITRD}"
+		then
+			local mkimage_cmd=$(type -p mkimage)
+			[[ -z ${mkimage_cmd} ]] && gen_die "mkimage is not available. Please install package 'dev-embedded/u-boot-tools'."
+			local mkimage_args="-A ${ARCH} -O linux -T ramdisk -C ${compression:-none} -a 0x00000000 -e 0x00000000"
+			print_info 1 "        >> Wrapping initramfs using mkimage..."
+			print_info 2 "${mkimage_cmd} ${mkimage_args} -n initramfs-${KV} -d ${CPIO} ${CPIO}.uboot" 
+			${mkimage_cmd} ${mkimage_args} -n "initramfs-${KV}" -d "${CPIO}" "${CPIO}.uboot" >> ${LOGFILE} 2>&1 || gen_die "Wrapping initramfs using mkimage failed"
+			mv -f "${CPIO}.uboot" "${CPIO}" || gen_die "Rename failed"
+		fi
 	fi
 
 	if isTrue "${CMD_INSTALL}"
diff --git a/genkernel.conf b/genkernel.conf
index 0c3955c..7f42b05 100644
--- a/genkernel.conf
+++ b/genkernel.conf
@@ -296,6 +296,8 @@ DEFAULT_KERNEL_SOURCE="/usr/src/linux"
 # "fastest" selects the fastest available compression method
 #COMPRESS_INITRD_TYPE="best"
 
+# wrap initramfs using mkimage for u-boot bootloader
+# WRAP_INITRD=no
 
 # Create a self-contained env in the initramfs
 #NETBOOT="1"