diff --git a/tests/drivers/flash/common/boards/ek_ra8d1.overlay b/tests/drivers/flash/common/boards/ek_ra8d1.overlay
index 8e42c66387c..ee45617b009 100644
--- a/tests/drivers/flash/common/boards/ek_ra8d1.overlay
+++ b/tests/drivers/flash/common/boards/ek_ra8d1.overlay
@@ -18,3 +18,7 @@
 		};
 	};
 };
+
+&s28hl512t {
+	status = "disabled";
+};
diff --git a/tests/drivers/flash/common/boards/ek_ra8d1_ospi_b_nor.conf b/tests/drivers/flash/common/boards/ek_ra8d1_ospi_b_nor.conf
new file mode 100644
index 00000000000..349d703d783
--- /dev/null
+++ b/tests/drivers/flash/common/boards/ek_ra8d1_ospi_b_nor.conf
@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_TEST_DRIVER_FLASH_SIZE=67108864
diff --git a/tests/drivers/flash/common/boards/ek_ra8d1_ospi_b_nor.overlay b/tests/drivers/flash/common/boards/ek_ra8d1_ospi_b_nor.overlay
new file mode 100644
index 00000000000..cb05c656afa
--- /dev/null
+++ b/tests/drivers/flash/common/boards/ek_ra8d1_ospi_b_nor.overlay
@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &storage_partition;
+
+&s28hl512t {
+	status = "okay";
+};
diff --git a/tests/drivers/flash/common/boards/ek_ra8m1.overlay b/tests/drivers/flash/common/boards/ek_ra8m1.overlay
index 8e42c66387c..ee45617b009 100644
--- a/tests/drivers/flash/common/boards/ek_ra8m1.overlay
+++ b/tests/drivers/flash/common/boards/ek_ra8m1.overlay
@@ -18,3 +18,7 @@
 		};
 	};
 };
+
+&s28hl512t {
+	status = "disabled";
+};
diff --git a/tests/drivers/flash/common/boards/ek_ra8m1_ospi_b_nor.conf b/tests/drivers/flash/common/boards/ek_ra8m1_ospi_b_nor.conf
new file mode 100644
index 00000000000..349d703d783
--- /dev/null
+++ b/tests/drivers/flash/common/boards/ek_ra8m1_ospi_b_nor.conf
@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_TEST_DRIVER_FLASH_SIZE=67108864
diff --git a/tests/drivers/flash/common/boards/ek_ra8m1_ospi_b_nor.overlay b/tests/drivers/flash/common/boards/ek_ra8m1_ospi_b_nor.overlay
new file mode 100644
index 00000000000..cb05c656afa
--- /dev/null
+++ b/tests/drivers/flash/common/boards/ek_ra8m1_ospi_b_nor.overlay
@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &storage_partition;
+
+&s28hl512t {
+	status = "okay";
+};
diff --git a/tests/drivers/flash/common/src/main.c b/tests/drivers/flash/common/src/main.c
index fa2fd053fd8..03b3c08a6cf 100644
--- a/tests/drivers/flash/common/src/main.c
+++ b/tests/drivers/flash/common/src/main.c
@@ -12,6 +12,8 @@
 
 #if defined(CONFIG_NORDIC_QSPI_NOR)
 #define TEST_AREA_DEV_NODE	DT_INST(0, nordic_qspi_nor)
+#elif defined(CONFIG_FLASH_RENESAS_RA_OSPI_B)
+#define TEST_AREA_DEV_NODE	DT_INST(0, renesas_ra_ospi_b_nor)
 #elif defined(CONFIG_SPI_NOR)
 #define TEST_AREA_DEV_NODE	DT_INST(0, jedec_spi_nor)
 #elif defined(CONFIG_FLASH_MSPI_NOR)
@@ -32,12 +34,18 @@
 #elif defined(TEST_AREA_DEV_NODE)
 
 #define TEST_AREA_DEVICE	DEVICE_DT_GET(TEST_AREA_DEV_NODE)
+#if defined CONFIG_FLASH_RENESAS_RA_OSPI_B
+#define TEST_AREA_OFFSET	0x40000
+#else
 #define TEST_AREA_OFFSET	0xff000
+#endif
 
 #if DT_NODE_HAS_PROP(TEST_AREA_DEV_NODE, size_in_bytes)
 #define TEST_AREA_MAX DT_PROP(TEST_AREA_DEV_NODE, size_in_bytes)
-#else
+#elif DT_NODE_HAS_PROP(TEST_AREA_DEV_NODE, size)
 #define TEST_AREA_MAX (DT_PROP(TEST_AREA_DEV_NODE, size) / 8)
+#else
+#define TEST_AREA_MAX DT_REG_SIZE(TEST_AREA_DEV_NODE)
 #endif
 
 #else
diff --git a/tests/drivers/flash/common/testcase.yaml b/tests/drivers/flash/common/testcase.yaml
index c1adeeeaaba..4facec276b4 100644
--- a/tests/drivers/flash/common/testcase.yaml
+++ b/tests/drivers/flash/common/testcase.yaml
@@ -138,3 +138,10 @@ tests:
     filter: dt_compat_enabled("soc-nv-flash") and dt_compat_enabled("jedec,spi-nor")
     extra_args:
       - CONFIG_SPI_NOR=n
+  drivers.flash.common.ra_ospi_b_nor:
+    platform_allow:
+      - ek_ra8m1
+      - ek_ra8d1
+    extra_args:
+      - DTC_OVERLAY_FILE="./boards/${BOARD}_ospi_b_nor.overlay"
+      - CONF_FILE="./prj.conf ./boards/${BOARD}_ospi_b_nor.conf"