oeqa/selftest/cases: add basic u-boot test

This adds basic tests for qemuarm and qemuarm64.

So far, U-Boot fails to run properly under KVM since this requires some
special care with instructions used for MMIO accesses.

Reported upstream by Ahmad Fatoum after debugging the oe-selftest
failures for this series:
https://lore.kernel.org/u-boot/2211f9f0-cd7d-4b55-860d-a34c04877e7b@pengutronix.de/

For now, simply disable KVM for these tests.

(From OE-Core rev: cadbd937e6358f9811f3ba7cf20cc50f8edcd844)

Signed-off-by: Enrico Jorns <ejo@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/uboot.py

@@ -0,0 +1,43 @@
+# Qemu-based u-boot bootloader integration testing
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+from oeqa.selftest.case import OESelftestTestCase
+from oeqa.utils.commands import bitbake, runqemu
+from oeqa.core.decorator.data import skipIfNotArch
+from oeqa.core.decorator import OETestTag
+
+uboot_boot_patterns = {
+        'search_reached_prompt': "stop autoboot",
+        'search_login_succeeded': "=>",
+        'search_cmd_finished': "=>"
+        }
+
+
+class UBootTest(OESelftestTestCase):
+
+    @skipIfNotArch(['arm', 'aarch64'])
+    @OETestTag("runqemu")
+    def test_boot_uboot(self):
+        """
+        Tests building u-boot and booting it with QEMU
+        """
+
+        self.write_config("""
+QB_DEFAULT_BIOS = "u-boot.bin"
+PREFERRED_PROVIDER_virtual/bootloader = "u-boot"
+QEMU_USE_KVM = "False"
+""")
+        bitbake("virtual/bootloader core-image-minimal")
+
+        with runqemu('core-image-minimal', ssh=False, runqemuparams='nographic',
+                     boot_patterns=uboot_boot_patterns) as qemu:
+
+            # test if u-boot console works
+            cmd = "version"
+            status, output = qemu.run_serial(cmd)
+            self.assertEqual(status, 1, msg=output)
+            self.assertTrue("U-Boot" in output, msg=output)