tests/functional/arm: Add AST2600 boot test with generated OTP image

Add a functional test that boots an AST2600 machine with a generated
OTP image. The test verifies that OTP contents are read during early
boot and that the system reaches the expected console prompt.

Signed-off-by: Kane-Chen-AS <kane_chen@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250917035917.4141723-4-kane_chen@aspeedtech.com
[ clg: checkpath fixes ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

tests/functional/arm/test_aspeed_ast2600.py

@@ -136,5 +136,20 @@ class AST2600Machine(AspeedTest):
         exec_command_and_wait_for_pattern(self,
              '/sbin/hwclock -f /dev/rtc1', year)
 
+    def test_arm_ast2600_otp_blockdev_device(self):
+        self.vm.set_machine("ast2600-evb")
+
+        image_path = self.archive_extract(self.ASSET_SDK_V907_AST2600)
+        otp_img = self.generate_otpmem_image()
+
+        self.vm.set_console()
+        self.vm.add_args(
+            "-blockdev", f"driver=file,filename={otp_img},node-name=otp",
+            "-global", "aspeed-otp.drive=otp",
+        )
+        self.do_test_arm_aspeed_sdk_start(
+            self.scratch_file("ast2600-default", "image-bmc"))
+        self.wait_for_console_pattern("ast2600-default login:")
+
 if __name__ == '__main__':
     AspeedTest.main()