kernel-imximage.bbclass: Linux kernel with DCD headers

This new image type adds support to generate a Linux kernel with DCD
headers. Essentially it adds support to directly boot a Linux kernel
without a bootloader.

As the Linux kernel will be boot directly, it required that the Device
Tree is appended to the kernel image, which had support included in
OE-Core.

To have the Linux kernel generated with the DCD headers, following
steps must be followed:

 - Linux kernel recipe must inherit kernel-imximage class;
 - Device Tree appended Linux kernel must be used
   (KERNEL_DEVICETREE_BUNDLE = "1");
 - DCD header configuration must be provided (dcd.cfg or
   dcd-<devicetree>.cfg);

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

1 files changed, 41 insertions, 0 deletions

diff --git a/classes/kernel-imximage.bbclass b/classes/kernel-imximage.bbclass
new file mode 100644
index 00000000..efc819f0
--- /dev/null
+++ b/classes/kernel-imximage.bbclass
@@ -0,0 +1,41 @@
+DEPENDS_append = ' u-boot-mkimage-native'
+
+IMXIMAGE_ENTRYPOINT ?= "${UBOOT_ENTRYPOINT}"
+
+imx_mkimage() {
+        uboot-mkimage -n $1 -T imximage -e ${IMXIMAGE_ENTRYPOINT} -d $2 $2.imx
+}
+
+gen_imximage() {
+        if [ -z "${IMXIMAGE_ENTRYPOINT}" ]; then
+                bbfatal "IMXIMAGE_ENTRYPOINT must have a valid value"
+        fi
+
+        for DTB in ${KERNEL_DEVICETREE}; do
+                DTB=`normalize_dtb "${DTB}"`
+                DTB_EXT=${DTB##*.}
+                DTB_BASE_NAME=`basename ${DTB} ."${DTB_EXT}"`
+                base_name="zImage-"${KERNEL_IMAGE_BASE_NAME}
+                symlink_name="zImage-"${KERNEL_IMAGE_SYMLINK_NAME}
+                DTB_NAME=`echo ${base_name} | sed "s/${MACHINE}/${DTB_BASE_NAME}/g"`
+                DTB_SYMLINK_NAME=`echo ${symlink_name} | sed "s/${MACHINE}/${DTB_BASE_NAME}/g"`
+                for DCD in dcd-${DTB}.cfg dcd.cfg; do
+                        if [ -e "${WORKDIR}/${DCD}" ]; then
+                                if [ -e ${DEPLOYDIR}/${DTB_NAME}.${DTB_EXT}.bin ]; then
+                                        imx_mkimage ${WORKDIR}/${DCD} ${DEPLOYDIR}/${DTB_NAME}.${DTB_EXT}.bin
+                                        ln -sf ${DTB_NAME}.${DTB_EXT}.bin.imx ${DEPLOYDIR}/$type-${DTB_BASE_NAME}.${DTB_EXT}.bin.imx
+                                fi
+
+                                if [ -e ${DEPLOYDIR}/zImage-${INITRAMFS_BASE_NAME}-${DTB_BASE_NAME}.${DTB_EXT}.bin ]; then
+                                        imx_mkimage ${WORKDIR}/${DCD} ${DEPLOYDIR}/zImage-${INITRAMFS_BASE_NAME}-${DTB_BASE_NAME}.${DTB_EXT}.bin
+                                        ln -sf zImage-${INITRAMFS_BASE_NAME}-${DTB_BASE_NAME}.${DTB_EXT}.bin.imx \
+                                           ${DEPLOYDIR}/zImage-initramfs-${DTB_BASE_NAME}.${DTB_EXT}-${MACHINE}.bin.imx
+                                fi
+                        fi
+                done
+        done
+}
+
+do_deploy_append() {
+        gen_imximage
+}