4 files changed, 92 insertions, 0 deletions
diff --git a/tools/binman/etype/renesas_rcar4_sa0.py b/tools/binman/etype/renesas_rcar4_sa0.py
new file mode 100644
index 00000000000..3a7c0988fdc
--- /dev/null
+++ b/tools/binman/etype/renesas_rcar4_sa0.py
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright 2025 Marek Vasut <marek.vasut+renesas@mailbox.org>
+#
+# Entry-type module for generating the Renesas R-Car Gen4 SA0 header.
+#
+
+import os
+import struct
+
+from binman.etype.section import Entry_section
+from dtoc import fdt_util
+from u_boot_pylib import tools
+
+RCAR_GEN4_SF_HEADER_SIZE    = 0x40000
+RCAR_GEN4_SF_MAX_LOAD_SIZE  = 0xec000
+
+class Entry_renesas_rcar4_sa0(Entry_section):
+    """Renesas R-Car Gen4 SA0 generator"""
+
+    def __init__(self, section, etype, node):
+        super().__init__(section, etype, node)
+        self.required_props = ['renesas,loader-address']
+
+    def ReadNode(self):
+        self.loader_address = fdt_util.GetInt(self._node, 'renesas,loader-address')
+        super().ReadNode()
+
+    def BuildSectionData(self, required):
+        data = super().BuildSectionData(required)[RCAR_GEN4_SF_HEADER_SIZE:]
+
+        # Offset 0x0000 / Value 0x00000000
+        header = struct.pack('<I', 0)
+        header += tools.get_bytes(0xff, 0x3008)
+        # Offset 0x300c / Value 0x00000000
+        header += struct.pack('<I', 0)
+        header += tools.get_bytes(0xff, 0x144)
+        # Offset 0x3154 / Value (payload load address)
+        header += struct.pack('<I', self.loader_address)
+        header += tools.get_bytes(0xff, 0x10c)
+        # Offset 0x3264 / Value (payload size in 4-byte words, aligned to 4k)
+        header += struct.pack('<I', int(tools.align(len(data), 0x1000) / 4))
+        header += tools.get_bytes(0xff, 0x3cd98)
+        if len(data) > RCAR_GEN4_SF_MAX_LOAD_SIZE:
+            self.Raise(f'SRAM data longer than {RCAR_GEN4_SF_MAX_LOAD_SIZE} Bytes')
+
+        return header + data
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 8225216fbec..a90db3c9351 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -5586,6 +5586,17 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
         data = self._DoReadFile('347_bl1.dts')
         self.assertEqual(ATF_BL1_DATA, data[:len(ATF_BL1_DATA)])
 
+    def testRenesasRCarGen4SA0Image(self):
+        """Test that binman can produce an Renesas R-Car Gen4 SA0 image"""
+        self._DoTestFile('348_renesas_rcar4_sa0.dts')
+
+    def testRenesasRCarGen4SA0ImageSize(self):
+        """Test that binman can not produce large Renesas R-Car Gen4 SA0 image"""
+        with self.assertRaises(ValueError) as exc:
+            self._DoTestFile('349_renesas_rcar4_sa0_size.dts')
+        self.assertIn("Node '/binman/renesas-rcar4-sa0': SRAM data longer than 966656 Bytes",
+                      str(exc.exception))
+
     def testFitFdtOper(self):
         """Check handling of a specified FIT operation"""
         entry_args = {
diff --git a/tools/binman/test/348_renesas_rcar4_sa0.dts b/tools/binman/test/348_renesas_rcar4_sa0.dts
new file mode 100644
index 00000000000..4a8717520f2
--- /dev/null
+++ b/tools/binman/test/348_renesas_rcar4_sa0.dts
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		renesas-rcar4-sa0 {
+			filename = "sa0.bin";
+			renesas,loader-address = <0x10>;
+		};
+	};
+};
diff --git a/tools/binman/test/349_renesas_rcar4_sa0_size.dts b/tools/binman/test/349_renesas_rcar4_sa0_size.dts
new file mode 100644
index 00000000000..eaf4507260b
--- /dev/null
+++ b/tools/binman/test/349_renesas_rcar4_sa0_size.dts
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		renesas-rcar4-sa0 {
+			filename = "sa0.bin";
+			renesas,loader-address = <0x10>;
+
+			fill {	/* Oversize fill to cover size check */
+				size = <0x140000>;
+				fill-byte = [ff];
+			};
+		};
+	};
+};