kernel: Pull uImage generation into separate class

Pull the uImage image format generation from kernel.bbclass into
a separate kernel-uimage.bbclass. Introduce new KERNEL_CLASSES
variable, which allows registration of additional classes which
implement new kernel image types. The default value of is to
register kernel-uimage to preserve the original behavior.

(From OE-Core rev: 086536ac84fcc9350802c09166f600becd52a1f8)

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: Koen Kooi <koen@dominion.thruhere.net>
Cc: Paul Eggleton <paul.eggleton@linux.intel.com>
Cc: Ross Burton <ross.burton@intel.com>
Cc: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 17 insertions, 45 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index ba4bc607b0..76d03dc4a7 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -20,10 +20,6 @@ python __anonymous () {
     import re
 
     kerneltype = d.getVar('KERNEL_IMAGETYPE', True)
-    if kerneltype == 'uImage':
-        depends = d.getVar("DEPENDS", True)
-        depends = "%s u-boot-mkimage-native" % depends
-        d.setVar("DEPENDS", depends)
 
     d.setVar("KERNEL_IMAGETYPE_FOR_MAKE", re.sub(r'\.gz$', '', kerneltype))
 
@@ -40,6 +36,23 @@ python __anonymous () {
         d.appendVarFlag('do_configure', 'depends', ' ${INITRAMFS_TASK}')
 }
 
+# Here we pull in all various kernel image types which we support.
+#
+# In case you're wondering why kernel.bbclass inherits the other image
+# types instead of the other way around, the reason for that is to
+# maintain compatibility with various currently existing meta-layers.
+# By pulling in the various kernel image types here, we retain the
+# original behavior of kernel.bbclass, so no meta-layers should get
+# broken.
+#
+# KERNEL_CLASSES by default pulls in kernel-uimage.bbclass, since this
+# used to be the default behavior when only uImage was supported. This
+# variable can be appended by users who implement support for new kernel
+# image types.
+
+KERNEL_CLASSES ?= " kernel-uimage "
+inherit ${KERNEL_CLASSES}
+
 # Old style kernels may set ${S} = ${WORKDIR}/git for example
 # We need to move these over to STAGING_KERNEL_DIR. We can't just
 # create the symlink in advance as the git fetcher can't cope with
@@ -437,47 +450,6 @@ MODULE_TARBALL_BASE_NAME ?= "${MODULE_IMAGE_BASE_NAME}.tgz"
 MODULE_TARBALL_SYMLINK_NAME ?= "modules-${MACHINE}.tgz"
 MODULE_TARBALL_DEPLOY ?= "1"
 
-uboot_prep_kimage() {
-        if test -e arch/${ARCH}/boot/compressed/vmlinux ; then
-                vmlinux_path="arch/${ARCH}/boot/compressed/vmlinux"
-                linux_suffix=""
-                linux_comp="none"
-        else
-                vmlinux_path="vmlinux"
-                linux_suffix=".gz"
-                linux_comp="gzip"
-        fi
-
-        ${OBJCOPY} -O binary -R .note -R .comment -S "${vmlinux_path}" linux.bin
-
-        if [ "${linux_comp}" != "none" ] ; then
-                rm -f linux.bin
-                gzip -9 linux.bin
-                mv -f "linux.bin${linux_suffix}" linux.bin
-        fi
-
-        echo "${linux_comp}"
-}
-
-do_uboot_mkimage() {
-        if test "x${KERNEL_IMAGETYPE}" = "xuImage" ; then 
-                if test "x${KEEPUIMAGE}" != "xyes" ; then
-                        uboot_prep_kimage
-
-                        ENTRYPOINT=${UBOOT_ENTRYPOINT}
-                        if test -n "${UBOOT_ENTRYSYMBOL}"; then
-                                ENTRYPOINT=`${HOST_PREFIX}nm ${S}/vmlinux | \
-                                        awk '$3=="${UBOOT_ENTRYSYMBOL}" {print $1}'`
-                        fi
-
-                        uboot-mkimage -A ${UBOOT_ARCH} -O linux -T kernel -C "${linux_comp}" -a ${UBOOT_LOADADDRESS} -e $ENTRYPOINT -n "${DISTRO_NAME}/${PV}/${MACHINE}" -d linux.bin arch/${ARCH}/boot/uImage
-                        rm -f linux.bin
-                fi
-        fi
-}
-
-addtask uboot_mkimage before do_install after do_compile
-
 kernel_do_deploy() {
         install -m 0644 ${KERNEL_OUTPUT} ${DEPLOYDIR}/${KERNEL_IMAGE_BASE_NAME}.bin
         if [ ${MODULE_TARBALL_DEPLOY} = "1" ] && (grep -q -i -e '^CONFIG_MODULES=y$' .config); then