kernel-fitimage.bbclass: Introduce a way to provide external dtb

Currently kernel-fitimage gets the dtb from KERNEL_DEVICETREE, however
there are instances when the DTB file can be generated using other
recipes, provide a way to include the DTB instead of inkernel device
tree.

Add support for external device tree during the creation of fitimage.  If
virtual/dtb is set using PREFERRED_PROVIDER_virtual/dtb = "devicetree", which
inherits the devicetree.bbclass then use the path provided in
EXTERNAL_KERNEL_DEVICETREE else use KERNEL_DEVICETREE during fitimage process

(From OE-Core rev: 084f4de4dbaf9821516fc0254d35f4fb04311d27)

Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha@xilinx.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/meta/classes/kernel-fitimage.bbclass b/meta/classes/kernel-fitimage.bbclass
index 8ebd3ddd1e..3adb1c94db 100644
--- a/meta/classes/kernel-fitimage.bbclass
+++ b/meta/classes/kernel-fitimage.bbclass
@@ -30,6 +30,13 @@ python __anonymous () {
         if image:
             d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')
 
+        #check if there are any dtb providers
+        providerdtb = d.getVar("PREFERRED_PROVIDER_virtual/dtb")
+        if providerdtb:
+            d.appendVarFlag('do_assemble_fitimage', 'depends', ' virtual/dtb:do_populate_sysroot')
+            d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' virtual/dtb:do_populate_sysroot')
+            d.setVar('EXTERNAL_KERNEL_DEVICETREE', "${RECIPE_SYSROOT}/boot/devicetree")
+
         # Verified boot will sign the fitImage and append the public key to
         # U-Boot dtb. We ensure the U-Boot dtb is deployed before assembling
         # the fitImage:
@@ -373,7 +380,8 @@ fitimage_assemble() {
         #
         # Step 2: Prepare a DTB image section
         #
-        if [ -n "${KERNEL_DEVICETREE}" ]; then
+
+        if [ -z "${EXTERNAL_KERNEL_DEVICETREE}" ] && [ -n "${KERNEL_DEVICETREE}" ]; then
                 dtbcount=1
                 for DTB in ${KERNEL_DEVICETREE}; do
                         if echo ${DTB} | grep -q '/dts/'; then
@@ -391,6 +399,16 @@ fitimage_assemble() {
                 done
         fi
 
+        if [ -n "${EXTERNAL_KERNEL_DEVICETREE}" ]; then
+                dtbcount=1
+                for DTBFILE in ${EXTERNAL_KERNEL_DEVICETREE}/*.dtb; do
+                        DTB=`basename ${DTBFILE}`
+                        DTB=$(echo "${DTB}" | tr '/' '_')
+                        DTBS="${DTBS} ${DTB}"
+                        fitimage_emit_section_dtb ${1} ${DTB} ${DTBFILE}
+                done
+        fi
+
         #
         # Step 3: Prepare a setup section. (For x86)
         #