[meta-xilinx] xilinx-kernel.bbclass: Fix support for binary device tree generation.

[Elvis Dowson <elvis.dowson@gmail.com>]

This commit fixes support for binary device tree generation, which was
broken as a result of commit 8c904eb643ad8ca1bc29cb2d870a80b355dcb341
in oe-core:

linux-dtb: add multi-dtb build support
    including following enhancement:
    * support multi-dtb build
    * skip dtb build and install when KERNEL_DEVICETREE is empty
    * print a warning message when specified dts file is not available

Signed-off-by: Elvis Dowson <elvis.dowson@gmail.com>
---
 classes/xilinx-kernel.bbclass |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/classes/xilinx-kernel.bbclass b/classes/xilinx-kernel.bbclass
index 14f4c7d..7c51b3d 100644
--- a/classes/xilinx-kernel.bbclass
+++ b/classes/xilinx-kernel.bbclass
@@ -22,16 +22,14 @@ def device_tree(a, d):
 
     board = bb.data.getVar('XILINX_BOARD', d, 1)
     cpu = bb.data.getVar('TARGET_CPU', d, 1)
-
     if re.match('powerpc', a):
         target = cpu + '-' + board
-        dts = 'arch/' + a + '/boot/dts/virtex' + target + '.dts'
+        dts = '${S}/arch/' + a + '/boot/dts/virtex' + target + '.dts'
     else:
         target = 'system'
-        dts = 'arch/' + a + '/boot/dts/' + target + '.dts'
+        dts = '${S}/arch/' + a + '/boot/dts/' + target + '.dts'
 
     bb.data.setVar('KERNEL_TARGET', target, d)
-
     return dts
 
 
@@ -44,10 +42,10 @@ if [ -n "${XILINX_BSP_PATH}" ]; then
 		if [ -e "$dts" ]; then
 			bbnote "Xilinx BSP device tree located in: ${dts}"
 			if [ "${TARGET_ARCH}" = "powerpc" ]; then
-				bbnote "Replacing linux kernel powerpc device tree to match located hardware model"
+				bbnote "Replacing linux kernel powerpc device tree to match located hardware model: virtex${KERNEL_TARGET}.dts"
 				cp -pP ${dts} ${S}/arch/powerpc/boot/dts/virtex${KERNEL_TARGET}.dts
 			else
-				bbnote "Replacing linux kernel microblaze device tree to match located hardware model"
+				bbnote "Replacing linux kernel microblaze device tree to match located hardware model: ${KERNEL_TARGET}.dts"
 				cp -pP ${dts} ${S}/arch/microblaze/platform/generic/${KERNEL_TARGET}.dts
 			fi
 		else
-- 
1.7.9.5