diff --git a/samples/subsys/audio/sof/boards/intel_adsp_cavs15.conf b/samples/subsys/audio/sof/boards/intel_adsp_cavs15.conf
index ecc40cf02ac..bcaf871c134 100644
--- a/samples/subsys/audio/sof/boards/intel_adsp_cavs15.conf
+++ b/samples/subsys/audio/sof/boards/intel_adsp_cavs15.conf
@@ -1,7 +1,6 @@
 CONFIG_APOLLOLAKE=y
 CONFIG_INTEL_DMIC=y
 CONFIG_INTEL_SSP=y
-CONFIG_CORE_COUNT=1
 CONFIG_LP_MEMORY_BANKS=2
 CONFIG_HP_MEMORY_BANKS=8
 CONFIG_PERFORMANCE_COUNTERS=y
diff --git a/samples/subsys/audio/sof/prj.conf b/samples/subsys/audio/sof/prj.conf
index 2be9a027b56..3e7021795da 100644
--- a/samples/subsys/audio/sof/prj.conf
+++ b/samples/subsys/audio/sof/prj.conf
@@ -1,8 +1,10 @@
 CONFIG_SOF=y
-CONFIG_SMP=n
 CONFIG_LOG=y
-CONFIG_MP_NUM_CPUS=1
 CONFIG_BUILD_OUTPUT_BIN=n
 
 # Requires heap_info() be implemented, but no Zephyr wrapper
 CONFIG_DEBUG_MEMORY_USAGE_SCAN=n
+
+CONFIG_SCHED_DEADLINE=y
+CONFIG_SCHED_CPU_MASK=y
+CONFIG_SMP_BOOT_DELAY=y
diff --git a/soc/xtensa/intel_adsp/cavs_v18/Kconfig.defconfig.series b/soc/xtensa/intel_adsp/cavs_v18/Kconfig.defconfig.series
index 6383d6eea24..0c11061851e 100644
--- a/soc/xtensa/intel_adsp/cavs_v18/Kconfig.defconfig.series
+++ b/soc/xtensa/intel_adsp/cavs_v18/Kconfig.defconfig.series
@@ -68,6 +68,7 @@ endif # LOG
 
 if SMP
 
+# FIXME: these DSPs can have more cores, but Zephyr only supports up to 2 cores on them
 config MP_NUM_CPUS
 	default 2
 
diff --git a/soc/xtensa/intel_adsp/cavs_v20/Kconfig.defconfig.series b/soc/xtensa/intel_adsp/cavs_v20/Kconfig.defconfig.series
index 31f02026eb2..39bca1571ac 100644
--- a/soc/xtensa/intel_adsp/cavs_v20/Kconfig.defconfig.series
+++ b/soc/xtensa/intel_adsp/cavs_v20/Kconfig.defconfig.series
@@ -68,6 +68,7 @@ endif # LOG
 
 if SMP
 
+# FIXME: these DSPs can have more cores, but Zephyr only supports up to 2 cores on them
 config MP_NUM_CPUS
 	default 2
 
diff --git a/soc/xtensa/intel_adsp/cavs_v25/Kconfig.defconfig.series b/soc/xtensa/intel_adsp/cavs_v25/Kconfig.defconfig.series
index 564c3e725dd..31add8ed410 100644
--- a/soc/xtensa/intel_adsp/cavs_v25/Kconfig.defconfig.series
+++ b/soc/xtensa/intel_adsp/cavs_v25/Kconfig.defconfig.series
@@ -68,6 +68,7 @@ endif # LOG
 
 if SMP
 
+# FIXME: these DSPs can have more cores, but Zephyr only supports up to 2 cores on them
 config MP_NUM_CPUS
 	default 2