devicetree: Add support for DT overlays with RPi bootloader

Compile overlay device trees and put them in 'overlays/' folder
on sdcard RPi boot partition.

Change-Id: I3da0032b3c2618165008eec1fc94e97824d09099
Signed-off-by: Francois Muller <francois@concept-embarque.fr>

1 files changed, 15 insertions, 5 deletions

diff --git a/classes/sdcard_image-rpi.bbclass b/classes/sdcard_image-rpi.bbclass
index 63cd62a..43f1346 100644
--- a/classes/sdcard_image-rpi.bbclass
+++ b/classes/sdcard_image-rpi.bbclass
@@ -66,6 +66,11 @@ SDIMG = "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.rpi-sdimg"
 # Additional files and/or directories to be copied into the vfat partition from the IMAGE_ROOTFS.
 FATPAYLOAD ?= ""
 
+# Device Tree Overlays are assumed to be suffixed by '-overlay.dtb' string and will be put in a dedicated folder
+DT_ALL = "${@d.getVar('KERNEL_DEVICETREE', True) or ''}"
+DT_OVERLAYS = "${@oe.utils.str_filter('\S+\-overlay\.dtb$', '${DT_ALL}', d)}"
+DT_ROOT = "${@oe.utils.str_filter_out('\S+\-overlay\.dtb$', '${DT_ALL}', d)}"
+
 IMAGEDATESTAMP = "${@time.strftime('%Y.%m.%d',time.gmtime())}"
 
 IMAGE_CMD_rpi-sdimg () {
@@ -104,15 +109,20 @@ IMAGE_CMD_rpi-sdimg () {
                 ;;
         *)
                 if test -n "${KERNEL_DEVICETREE}"; then
-                        for DTB in ${KERNEL_DEVICETREE}; do
-                                if echo ${DTB} | grep -q '/dts/'; then
-                                        bbwarn "${DTB} contains the full path to the the dts file, but only the dtb name should be used."
-                                        DTB=`basename ${DTB} | sed 's,\.dts$,.dtb,g'`
-                                fi
+                        # Copy board device trees to root folder
+                        for DTB in ${DT_ROOT}; do
                                 DTB_BASE_NAME=`basename ${DTB} .dtb`
 
                                 mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${DTB_BASE_NAME}.dtb ::${DTB_BASE_NAME}.dtb
                         done
+
+                        # Copy device tree overlays to dedicated folder
+                        mmd -i ${WORKDIR}/boot.img overlays
+                        for DTB in ${DT_OVERLAYS}; do
+                                DTB_BASE_NAME=`basename ${DTB} .dtb`
+
+                                mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${DTB_BASE_NAME}.dtb ::overlays/${DTB_BASE_NAME}.dtb
+                        done
                 fi
                 mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}${KERNEL_INITRAMFS}-${MACHINE}.bin ::kernel.img
                 ;;