machine-xilinx-default: Implement default FIT_CONF_DEFAULT_DTB

When using a system device tree build there will be more then one device-tree
that is constructed.  If a fit image is constructed, then an DTB needs to be
selected.  We use the CONFIG_DTFILE as the default, which should inherit
from the SYSTEM_DTFILE.  The default for SYSTEM_DTFILE is empty as a fallback
which should restore the default behavior of first DTB found is the one used.

This also has ramifications for other recipes that use DTB files and unifies
everything.

Signed-off-by: Mark Hatle <mark.hatle@amd.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/meta-xilinx-core/conf/machine/include/machine-xilinx-default.inc b/meta-xilinx-core/conf/machine/include/machine-xilinx-default.inc
index e5437792..105e3f57 100644
--- a/meta-xilinx-core/conf/machine/include/machine-xilinx-default.inc
+++ b/meta-xilinx-core/conf/machine/include/machine-xilinx-default.inc
@@ -57,6 +57,13 @@ XSERVER ?= " \
         ${XSERVER_EXT} \
         "
 
+# If the user generates a fit-image, there may be more then one DTB to choose from
+# define a reasonable default that should work for most cases.  If the default
+# does not work, the user will need to define their own value for FIT_CONF_DEFAULT_DTB
+SYSTEM_DTFILE ??= ""
+CONFIG_DTFILE ??= "${SYSTEM_DTFILE}"
+FIT_CONF_DEFAULT_DTB ?= "${@d.getVar('CONFIG_DTFILE').replace('.dts', '.dtb')}"
+
 # Define to avoid parsse errors below if undefind elsewhere
 INITRAMFS_IMAGE ??= ""