binman: Add support for align argument to mkimage tool

Add support to indicate what alignment to use for the FIT and its
external data. Pass the alignment to mkimage via the -B flag.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/binman/btool/mkimage.py

@@ -22,7 +22,7 @@ class Bintoolmkimage(bintool.Bintool):
 
     # pylint: disable=R0913
     def run(self, reset_timestamp=False, output_fname=None, external=False,
-            pad=None):
+            pad=None, align=None):
         """Run mkimage
 
         Args:
@@ -33,6 +33,7 @@ class Bintoolmkimage(bintool.Bintool):
             pad: Bytes to use for padding the FIT devicetree output. This allows
                 other things to be easily added later, if required, such as
                 signatures
+            align: Bytes to use for alignment of the FIT and its external data
             version: True to get the mkimage version
         """
         args = []
@@ -40,6 +41,8 @@ class Bintoolmkimage(bintool.Bintool):
             args.append('-E')
         if pad:
             args += ['-p', f'{pad:x}']
+        if align:
+            args += ['-B', f'{align:x}']
         if reset_timestamp:
             args.append('-t')
         if output_fname:

tools/binman/entries.rst

@@ -604,6 +604,11 @@ The top-level 'fit' node supports the following special properties:
         Indicates that the contents of the FIT are external and provides the
         external offset. This is passed to mkimage via the -E and -p flags.
 
+    fit,align
+        Indicates what alignment to use for the FIT and its external data,
+        and provides the alignment to use. This is passed to mkimage via
+        the -B flag.
+
     fit,fdt-list
         Indicates the entry argument which provides the list of device tree
         files for the gen-fdt-nodes operation (as below). This is often

tools/binman/etype/fit.py

@@ -70,6 +70,11 @@ class Entry_fit(Entry_section):
             Indicates that the contents of the FIT are external and provides the
             external offset. This is passed to mkimage via the -E and -p flags.
 
+        fit,align
+            Indicates what alignment to use for the FIT and its external data,
+            and provides the alignment to use. This is passed to mkimage via
+            the -B flag.
+
         fit,fdt-list
             Indicates the entry argument which provides the list of device tree
             files for the gen-fdt-nodes operation (as below). This is often
@@ -423,6 +428,9 @@ class Entry_fit(Entry_section):
                 'external': True,
                 'pad': fdt_util.fdt32_to_cpu(ext_offset.value)
                 }
+        align = self._fit_props.get('fit,align')
+        if align is not None:
+            args.update({'align': fdt_util.fdt32_to_cpu(align.value)})
         if self.mkimage.run(reset_timestamp=True, output_fname=output_fname,
                             **args) is None:
             # Bintool is missing; just use empty data as the output

tools/binman/ftest.py

@@ -6309,6 +6309,22 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
         self.assertEqual(base + 8, inset.image_pos);
         self.assertEqual(4, inset.size);
 
+    def testFitAlign(self):
+        """Test an image with an FIT with aligned external data"""
+        data = self._DoReadFile('275_fit_align.dts')
+        self.assertEqual(4096, len(data))
+
+        dtb = fdt.Fdt.FromData(data)
+        dtb.Scan()
+
+        props = self._GetPropTree(dtb, ['data-position'])
+        expected = {
+            'u-boot:data-position': 1024,
+            'fdt-1:data-position': 2048,
+            'fdt-2:data-position': 3072,
+        }
+        self.assertEqual(expected, props)
+
 
 if __name__ == "__main__":
     unittest.main()

tools/binman/test/275_fit_align.dts

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		fit {
+			description = "test desc";
+			#address-cells = <1>;
+			fit,external-offset = <1024>;
+			fit,align = <1024>;
+
+			images {
+				u-boot {
+					description = "test u-boot";
+					type = "standalone";
+					arch = "arm64";
+					os = "u-boot";
+					compression = "none";
+					load = <00000000>;
+					entry = <00000000>;
+
+					u-boot-nodtb {
+					};
+				};
+
+				fdt-1 {
+					description = "test fdt";
+					type = "flat_dt";
+					compression = "none";
+
+					u-boot-dtb {
+					};
+				};
+
+				fdt-2 {
+					description = "test fdt";
+					type = "flat_dt";
+					compression = "none";
+
+					u-boot-dtb {
+					};
+				};
+			};
+
+			configurations {
+				default = "config-1";
+				config-1 {
+					description = "test config";
+					fdt = "fdt-1";
+					firmware = "u-boot";
+				};
+			};
+		};
+	};
+};