zephyr: add CONFIG_SOF_BOOT_TEST_STANDALONE

Add a new variant to boot time testing for tests that will
either need the IPC host interface for test purposes and is
not guaranteed to be compatible with the normla host IPC interface,
or the tests cause side-effects which can influence behaviour
of the firmware after tests are complete.

This option is intended to run complex tests that use SOF
functionality, run on target hardware, but may not coexist with
normal functionality provided by SOF.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/ipc/ipc-common.c

@@ -294,6 +294,11 @@ __cold int ipc_init(struct sof *sof)
 
 	tr_dbg(&ipc_tr, "entry");
 
+#if CONFIG_SOF_BOOT_TEST_STANDALONE
+	LOG_INF("SOF_BOOT_TEST_STANDALONE, disabling IPC.");
+	return 0;
+#endif
+
 	/* init ipc data */
 	sof->ipc = rzalloc(SOF_MEM_FLAG_USER | SOF_MEM_FLAG_COHERENT, sizeof(*sof->ipc));
 	if (!sof->ipc) {

zephyr/Kconfig

@@ -178,6 +178,15 @@ config SOF_BOOT_TEST
 	  initialized. After that SOF will continue running and be usable as
 	  usual.
 
+config SOF_BOOT_TEST_STANDALONE
+	bool "enable tests at boot time that are run instead of SOF main"
+	select SOF_BOOT_TEST
+	select ZTEST
+	help
+	  Run extended set of tests at boot that can use IPC and interfere
+	  with system state. Normal IPC handling of the SOF application
+	  is disabled to allow more complex tests to run.
+
 config SOF_ZEPHYR_NO_SOF_CLOCK
 	bool
 	help