[PATCH 1/4] scripts/make_fit: factor dtb file name into configuration name

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Bootloaders often support booting a specific FIT configuration by name.
This is useful when the automatic boot fails, because the bootloader's
DT compatible differs from the upstream one included with the Linux
device trees.

Currently, configuration are numbered sequentially requiring the user to
dump the FIT image to determine what number the configuration has.

Improve upon this by naming configurations after the dtb name instead.
This is what OE-core kernel-fitimage.bbclass does for example.

Cc: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 scripts/make_fit.py | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/scripts/make_fit.py b/scripts/make_fit.py
index 075b7c258ff2..2190da4c003c 100755
--- a/scripts/make_fit.py
+++ b/scripts/make_fit.py
@@ -145,11 +145,9 @@ def finish_fit(fsw, entries):
             str: Compatible stringlist
     """
     fsw.end_node()
-    seq = 0
     with fsw.add_node('configurations'):
-        for model, compat, files in entries:
-            seq += 1
-            with fsw.add_node(f'conf-{seq}'):
+        for dtbname, model, compat, files in entries:
+            with fsw.add_node(f'conf-{dtbname}'):
                 fsw.property('compatible', bytes(compat))
                 fsw.property_string('description', model)
                 fsw.property('fdt', bytes(''.join(f'fdt-{x}\x00' for x in files), "ascii"))
@@ -266,6 +264,7 @@ def build_fit(args):
     fsw = libfdt.FdtSw()
     setup_fit(fsw, args.name)
     entries = []
+    dtbs_seen = set()
     fdts = {}
 
     # Handle the kernel
@@ -290,7 +289,13 @@ def build_fit(args):
 
         files_seq = [fdts[fn] for fn in files]
 
-        entries.append([model, compat, files_seq])
+        dtbname = os.path.basename(fname)
+        ndtbs_seen = len(dtbs_seen)
+        dtbs_seen.add(dtbname)
+        if len(dtbs_seen) == ndtbs_seen:
+            raise RuntimeError(f"Duplicate file name '{dtbname}' during FIT creation")
+
+        entries.append([dtbname, model, compat, files_seq])
 
     finish_fit(fsw, entries)
 
-- 
2.39.5