package/dtbocfg: new package

dtbocfg, which stands for Device Tree Blob Overlay Configuration
File System, was developed to serve as a userspace API of Device
Tree Overlay.

https://github.com/ikwzm/dtbocfg

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

support/testing/tests/package/test_dtbocfg.py

@@ -0,0 +1,37 @@
+import os
+
+import infra.basetest
+
+
+class TestDtbocfg(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.7"
+        BR2_LINUX_KERNEL_USE_DEFCONFIG=y
+        BR2_LINUX_KERNEL_DEFCONFIG="vexpress"
+        BR2_PACKAGE_DTBOCFG=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        img = os.path.join(self.builddir, "images", "rootfs.cpio")
+        kernel = os.path.join(self.builddir, "images", "zImage")
+        kernel_cmdline = ["console=ttyAMA0"]
+        dtb = infra.download(self.downloaddir, "vexpress-v2p-ca9.dtb")
+        options = ["-M", "vexpress-a9", "-dtb", dtb, "-initrd", img]
+
+        self.emulator.boot(arch="armv7", kernel=kernel,
+                           kernel_cmdline=kernel_cmdline,
+                           options=options)
+        self.emulator.login()
+        self.assertRunOk("modprobe dtbocfg.ko")
+        self.assertRunOk("mkdir /tmp/config && mount -t configfs none /tmp/config")
+
+        # Check that overlays directory is present.
+        # From dtbocfg site (https://github.com/ikwzm/dtbocfg):
+        #   If /config/device-tree/overlays is created, it is ready to use
+        #   dtbocfg
+        self.assertRunOk("ls /tmp/config/device-tree/overlays/")