linux-dtb: Add simple DTB symlinks for devicetree

* This is similar to the symlinks provided for the kernel image
  in the /boot directory of a file system.  The goal is to have
  simply named symlinks in /boot that mirror the device tree
  name in the kernel sources.  This is so that programs like
  U-Boot can easily find the default device tree binary in the
  /boot directory and use that when booting the kernel.
* Use update-alternatives to handle proper creation and removal
  of the symlinks.

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/meta/recipes-kernel/linux/linux-dtb.inc b/meta/recipes-kernel/linux/linux-dtb.inc
index ec6c375335..421ffa336c 100644
--- a/meta/recipes-kernel/linux/linux-dtb.inc
+++ b/meta/recipes-kernel/linux/linux-dtb.inc
@@ -45,3 +45,23 @@ do_deploy_append() {
         done
     fi
 }
+
+pkg_postinst_kernel-devicetree () {
+    cd /${KERNEL_IMAGEDEST}
+    for DTS_FILE in ${KERNEL_DEVICETREE}
+    do
+        DTS_BASE_NAME=`basename ${DTS_FILE} | awk -F "." '{print $1}'`
+        DTB_SYMLINK_NAME=`echo ${KERNEL_IMAGE_SYMLINK_NAME} | sed "s/${MACHINE}/${DTS_BASE_NAME}/g"`
+        update-alternatives --install /${KERNEL_IMAGEDEST}/${DTS_BASE_NAME}.dtb ${DTS_BASE_NAME}.dtb devicetree-${DTB_SYMLINK_NAME}.dtb ${KERNEL_PRIORITY} || true
+    done
+}
+
+pkg_postrm_kernel-devicetree () {
+    cd /${KERNEL_IMAGEDEST}
+    for DTS_FILE in ${KERNEL_DEVICETREE}
+    do
+        DTS_BASE_NAME=`basename ${DTS_FILE} | awk -F "." '{print $1}'`
+        DTB_SYMLINK_NAME=`echo ${KERNEL_IMAGE_SYMLINK_NAME} | sed "s/${MACHINE}/${DTS_BASE_NAME}/g"`
+        update-alternatives --remove ${DTS_BASE_NAME}.dtb devicetree-${DTB_SYMLINK_NAME}.dtb ${KERNEL_PRIORITY} || true
+    done
+}