test/py: Handle expected reboot while booting sandbox

Add expected_reset optional argument to ConsoleBase::ensure_spawned(),
ConsoleBase::restart_uboot() and ConsoleSandbox::restart_uboot_with_flags()
so that it can handle a reset while the 1st boot process after main
boot logo before prompt correctly.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

test/py/u_boot_console_base.py

@@ -139,7 +139,7 @@ class ConsoleBase(object):
             self.p.close()
         self.logstream.close()
 
-    def wait_for_boot_prompt(self):
+    def wait_for_boot_prompt(self, loop_num = 1):
         """Wait for the boot up until command prompt. This is for internal use only.
         """
         try:
@@ -149,6 +149,8 @@ class ConsoleBase(object):
             env_spl_skipped = self.config.env.get('env__spl_skipped', False)
             env_spl2_skipped = self.config.env.get('env__spl2_skipped', True)
 
+            while loop_num > 0:
+                loop_num -= 1
                 if config_spl and config_spl_serial and not env_spl_skipped:
                     m = self.p.expect([pattern_u_boot_spl_signon] +
                                       self.bad_patterns)
@@ -372,7 +374,7 @@ class ConsoleBase(object):
         finally:
             self.p.timeout = orig_timeout
 
-    def ensure_spawned(self):
+    def ensure_spawned(self, expect_reset=False):
         """Ensure a connection to a correctly running U-Boot instance.
 
         This may require spawning a new Sandbox process or resetting target
@@ -381,7 +383,9 @@ class ConsoleBase(object):
         This is an internal function and should not be called directly.
 
         Args:
-            None.
+            expect_reset: Boolean indication whether this boot is expected
+                to be reset while the 1st boot process after main boot before
+                prompt. False by default.
 
         Returns:
             Nothing.
@@ -400,7 +404,11 @@ class ConsoleBase(object):
             if not self.config.gdbserver:
                 self.p.timeout = 30000
             self.p.logfile_read = self.logstream
-            self.wait_for_boot_prompt()
+            if expect_reset:
+                loop_num = 2
+            else:
+                loop_num = 1
+            self.wait_for_boot_prompt(loop_num = loop_num)
             self.at_prompt = True
             self.at_prompt_logevt = self.logstream.logfile.cur_evt
         except Exception as ex:
@@ -433,10 +441,10 @@ class ConsoleBase(object):
             pass
         self.p = None
 
-    def restart_uboot(self):
+    def restart_uboot(self, expect_reset=False):
         """Shut down and restart U-Boot."""
         self.cleanup_spawn()
-        self.ensure_spawned()
+        self.ensure_spawned(expect_reset)
 
     def get_spawn_output(self):
         """Return the start-up output from U-Boot

test/py/u_boot_console_sandbox.py

@@ -57,11 +57,14 @@ class ConsoleSandbox(ConsoleBase):
         cmd += self.sandbox_flags
         return Spawn(cmd, cwd=self.config.source_dir)
 
-    def restart_uboot_with_flags(self, flags):
+    def restart_uboot_with_flags(self, flags, expect_reset=False):
         """Run U-Boot with the given command-line flags
 
         Args:
             flags: List of flags to pass, each a string
+            expect_reset: Boolean indication whether this boot is expected
+                to be reset while the 1st boot process after main boot before
+                prompt. False by default.
 
         Returns:
             A u_boot_spawn.Spawn object that is attached to U-Boot.
@@ -69,7 +72,7 @@ class ConsoleSandbox(ConsoleBase):
 
         try:
             self.sandbox_flags = flags
-            return self.restart_uboot()
+            return self.restart_uboot(expect_reset)
         finally:
             self.sandbox_flags = []