[OE-core][PATCH] kernel-fit-image: Add KERNEL_DTBVENDORED support for FIT_CONF_DEFAULT_DTB

[Ryan Eatmon <reatmon@ti.com>]

When specifying a FIT_CONF_DEFAULT_DTB for a machine, you have to
exactly align the name with what will be in the fitImage file or you
will get a build error.  If you also turn on KERNEL_DTBVENDORED then you
must also specify the vendor directory as part of the dtb name that you
want for the default, but you must manually do the same mapping that the
kernel-fit-image class is doing when it generates the fit-image.its file.

This patch just adds the same logic to figure out the value for the
requested default dtb and eliminate the need to understand the internal
mapping of the class.  It should make specifying the value more
intuitive.  The same value that you put in the KERNEL_DEVICETREE can be
used in the FIT_CONF_DEFAULT_DTB and the new code will correctly honor
the KERNEL_DTBVENDORED setting.

Before:

  KERNEL_DEVICETREE = "
    ti/k3-am62p5-sk.dtb \
    ... \
  "
  FIT_CONF_DEFAULT_DTB = "ti_k3-am62p5-sk.dtb"

After:

  KERNEL_DEVICETREE = "
    ti/k3-am62p5-sk.dtb \
    ... \
  "
  FIT_CONF_DEFAULT_DTB = "ti/k3-am62p5-sk.dtb"

Signed-off-by: Ryan Eatmon <reatmon@ti.com>
---
 meta/classes-recipe/kernel-fit-image.bbclass | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/meta/classes-recipe/kernel-fit-image.bbclass b/meta/classes-recipe/kernel-fit-image.bbclass
index 448a88ccb1..f49838d639 100644
--- a/meta/classes-recipe/kernel-fit-image.bbclass
+++ b/meta/classes-recipe/kernel-fit-image.bbclass
@@ -195,8 +195,21 @@ python do_compile() {
                                                  loadable_loadaddress,
                                                  loadable_entrypoint)
 
+    # Figure out if we have a default dtb and if we need to honor the
+    # KERNEL_DTBVENDORED variable to tweak the name to match what will be
+    # in the fitImage.
+    default_dtb = d.getVar("FIT_CONF_DEFAULT_DTB")
+    if default_dtb:
+        # With vendored DTs, replace any path separators with underscores,
+        # this matches the behavior used to generate the dtb entry in other
+        # parts of the code.
+        if d.getVar('KERNEL_DTBVENDORED') != "1":
+            default_dtb = os.path.basename(default_dtb)
+        else:
+            default_dtb = default_dtb.replace('/', '_')
+
     # Generate the configuration section
-    root_node.fitimage_emit_section_config(d.getVar("FIT_CONF_DEFAULT_DTB"), d.getVar("FIT_CONF_MAPPINGS"))
+    root_node.fitimage_emit_section_config(default_dtb, d.getVar("FIT_CONF_MAPPINGS"))
 
     # Write the its file
     root_node.write_its_file(itsfile)
-- 
2.43.0