diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 7f10ca6..d935436 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -2017,6 +2017,32 @@
 (that was copied during ``bl31_early_platform_setup()``) if the image exists. It
 should return NULL otherwise.
 
+Function : plat_get_cca_attest_token() [mandatory when ENABLE_RME == 1]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+    Argument : uintptr_t, size_t *, uintptr_t, size_t
+    Return   : int
+
+This function returns the Platform attestation token.
+
+The parameters of the function are:
+
+    arg0 - A pointer to the buffer where the Platform token should be copied by
+           this function. The buffer must be big enough to hold the Platform
+           token.
+
+    arg1 - Contains the size (in bytes) of the buffer passed in arg0. The
+           function returns the platform token length in this parameter.
+
+    arg2 - A pointer to the buffer where the challenge object is stored.
+
+    arg3 - The length of the challenge object in bytes. Possible values are 32,
+           48 and 64.
+
+The function returns 0 on success, -EINVAL on failure.
+
 Function : bl31_plat_enable_mmu [optional]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index 509fd58..9deb33d 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -303,6 +303,11 @@
 			unsigned int ncpu);
 
 /*******************************************************************************
+ * Mandatory BL31 functions when ENABLE_RME=1
+ ******************************************************************************/
+int plat_get_cca_attest_token(uintptr_t buf, size_t *len,
+			       uintptr_t hash, size_t hash_size);
+/*******************************************************************************
  * Optional BL31 functions (may be overridden)
  ******************************************************************************/
 void bl31_plat_enable_mmu(uint32_t flags);
diff --git a/include/services/rmmd_svc.h b/include/services/rmmd_svc.h
index 8eb49c8..9b4c39f 100644
--- a/include/services/rmmd_svc.h
+++ b/include/services/rmmd_svc.h
@@ -77,6 +77,26 @@
 #define RMMD_ERR_INVAL			-5
 #define RMMD_ERR_UNK			-6
 
+/*
+ * Retrieve Platform token from EL3.
+ * The arguments to this SMC are :
+ *    arg0 - Function ID.
+ *    arg1 - Platform attestation token buffer Physical address. (The challenge
+ *           object is passed in this buffer.)
+ *    arg2 - Platform attestation token buffer size (in bytes).
+ *    arg3 - Challenge object size (in bytes). It has be one of the defined SHA hash
+ *           sizes.
+ * The return arguments are :
+ *    ret0 - Status / error.
+ *    ret1 - Size of the platform token if successful.
+ */
+#define RMMD_ATTEST_GET_PLAT_TOKEN	RMM_FID(SMC_64, ATTEST_GET_PLAT_TOKEN)
+
+/* Acceptable SHA sizes for Challenge object */
+#define SHA256_DIGEST_SIZE	32U
+#define SHA384_DIGEST_SIZE	48U
+#define SHA512_DIGEST_SIZE	64U
+
 #ifndef __ASSEMBLER__
 #include <stdint.h>
 
diff --git a/plat/arm/board/fvp/fvp_plat_attest_token.c b/plat/arm/board/fvp/fvp_plat_attest_token.c
new file mode 100644
index 0000000..5463f33
--- /dev/null
+++ b/plat/arm/board/fvp/fvp_plat_attest_token.c
@@ -0,0 +1,317 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+
+/* Using hardcoded token values for AEM FVP */
+static uint8_t platform_token[] = {
+	0xD2, 0x84, 0x40, 0xA0, 0x59, 0x08, 0xB1, 0xD9,
+	0x61, 0xA8, 0xA9, 0x0A, 0x58, 0x40, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0x3A, 0x00,
+	0x01, 0x24, 0xFA, 0x58, 0x40, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+	0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0x3A, 0x00, 0x01,
+	0x25, 0x00, 0x58, 0x41, 0x01, 0x0B, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
+	0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0x12, 0x78, 0x1C,
+	0x68, 0x74, 0x74, 0x70, 0x3A, 0x2F, 0x2F, 0x61,
+	0x72, 0x6D, 0x2E, 0x63, 0x6F, 0x6D, 0x2F, 0x43,
+	0x43, 0x41, 0x2D, 0x53, 0x53, 0x44, 0x2F, 0x31,
+	0x2E, 0x30, 0x2E, 0x30, 0x0B, 0x58, 0x19, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0x3A, 0x00, 0x01, 0x24, 0xF7, 0x78, 0x1C, 0x68,
+	0x74, 0x74, 0x70, 0x3A, 0x2F, 0x2F, 0x61, 0x72,
+	0x6D, 0x2E, 0x63, 0x6F, 0x6D, 0x2F, 0x43, 0x43,
+	0x41, 0x2D, 0x53, 0x53, 0x44, 0x2F, 0x31, 0x2E,
+	0x30, 0x2E, 0x30, 0x3A, 0x00, 0x01, 0x25, 0x01,
+	0x78, 0x18, 0x68, 0x74, 0x74, 0x70, 0x73, 0x3A,
+	0x2F, 0x2F, 0x63, 0x63, 0x61, 0x5F, 0x76, 0x65,
+	0x72, 0x69, 0x66, 0x69, 0x65, 0x72, 0x2E, 0x6F,
+	0x72, 0x67, 0x3A, 0x00, 0x01, 0x24, 0xF9, 0x19,
+	0x30, 0x00, 0x3A, 0x00, 0x01, 0x24, 0xFD, 0x8D,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0xA4, 0x02, 0x58, 0x40, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
+	0xCC, 0xCC, 0xCC, 0xCC, 0x05, 0x58, 0x40, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
+	0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0x04,
+	0x65, 0x31, 0x2E, 0x30, 0x2E, 0x30, 0x06, 0x08,
+	0x58, 0x40, 0xD3, 0x8A, 0x41, 0xA6, 0xC1, 0x29,
+	0x98, 0x18, 0xB5, 0x16, 0x9C, 0x21, 0x78, 0xB7,
+	0x92, 0xF8, 0x26, 0x82, 0x76, 0x2F, 0x26, 0x45,
+	0x21, 0x6D, 0x0C, 0x21, 0x06, 0xF4, 0xB5, 0xE3,
+	0xA8, 0x07, 0xD1, 0xD6, 0x8C, 0x73, 0xA5, 0xC8,
+	0x16, 0xD8, 0x30, 0x68, 0xC0, 0xA4, 0x77, 0xE2,
+	0x1E, 0xD2, 0x17, 0x86, 0xC3, 0x68, 0x82, 0xDD,
+	0x21, 0x1B, 0xA3, 0xE2, 0xC7, 0xF7, 0x06, 0x33,
+	0xB0, 0x3A
+};
+
+int plat_get_cca_attest_token(uintptr_t buf, size_t *len,
+			       uintptr_t hash, size_t hash_size)
+{
+	(void)hash;
+	(void)hash_size;
+
+	if (*len < sizeof(platform_token)) {
+		return -EINVAL;
+	}
+
+	(void)memcpy((void *)buf, platform_token, sizeof(platform_token));
+	*len = sizeof(platform_token);
+
+	return 0;
+}
diff --git a/plat/arm/board/fvp/include/platform_def.h b/plat/arm/board/fvp/include/platform_def.h
index 77df610..5e5ddce 100644
--- a/plat/arm/board/fvp/include/platform_def.h
+++ b/plat/arm/board/fvp/include/platform_def.h
@@ -103,7 +103,7 @@
 # if SPM_MM
 #  define PLAT_ARM_MMAP_ENTRIES		10
 #  if ENABLE_RME
-#   define MAX_XLAT_TABLES		10
+#   define MAX_XLAT_TABLES		11
 #  else
 #   define MAX_XLAT_TABLES		9
 # endif
@@ -113,13 +113,13 @@
 #  define PLAT_ARM_MMAP_ENTRIES		9
 #  if USE_DEBUGFS
 #   if ENABLE_RME
-#    define MAX_XLAT_TABLES		9
+#    define MAX_XLAT_TABLES		10
 #   else
 #    define MAX_XLAT_TABLES		8
 #   endif
 #  else
 #   if ENABLE_RME
-#    define MAX_XLAT_TABLES		8
+#    define MAX_XLAT_TABLES		9
 #   else
 #    define MAX_XLAT_TABLES		7
 #   endif
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index acac886..895d773 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -193,6 +193,7 @@
 
 ifeq (${ENABLE_RME},1)
 BL2_SOURCES		+=	plat/arm/board/fvp/aarch64/fvp_helpers.S
+BL31_SOURCES		+=	plat/arm/board/fvp/fvp_plat_attest_token.c
 endif
 
 ifeq (${BL2_AT_EL3},1)
@@ -344,6 +345,10 @@
     endif
 endif
 
+ifeq (${ENABLE_RME},1)
+    BL31_CPPFLAGS	+=	-DPLAT_XLAT_TABLES_DYNAMIC
+endif
+
 ifeq (${ALLOW_RO_XLAT_TABLES}, 1)
     ifeq (${ARCH},aarch32)
         BL32_CPPFLAGS	+=	-DPLAT_RO_XLAT_TABLES
diff --git a/services/std_svc/rmmd/rmmd.mk b/services/std_svc/rmmd/rmmd.mk
index bac0a9f..bcf54e1 100644
--- a/services/std_svc/rmmd/rmmd.mk
+++ b/services/std_svc/rmmd/rmmd.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -12,7 +12,8 @@
 
 RMMD_SOURCES	+=	$(addprefix services/std_svc/rmmd/,	\
 			${ARCH}/rmmd_helpers.S			\
-			rmmd_main.c)
+			rmmd_main.c				\
+			rmmd_attest.c)
 
 # Let the top-level Makefile know that we intend to include RMM image
 NEED_RMM	:=	yes
diff --git a/services/std_svc/rmmd/rmmd_attest.c b/services/std_svc/rmmd/rmmd_attest.c
new file mode 100644
index 0000000..d111b88
--- /dev/null
+++ b/services/std_svc/rmmd/rmmd_attest.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <stdint.h>
+#include <string.h>
+#include <common/debug.h>
+#include <lib/spinlock.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat/common/platform.h>
+#include "rmmd_private.h"
+#include <services/rmmd_svc.h>
+
+static spinlock_t lock;
+
+/* For printing Realm attestation token hash */
+#define DIGITS_PER_BYTE				2UL
+#define LENGTH_OF_TERMINATING_ZERO_IN_BYTES	1UL
+#define BYTES_PER_LINE_BASE			4UL
+
+static void print_challenge(uint8_t *hash, size_t hash_size)
+{
+	size_t leftover;
+	/*
+	 * bytes_per_line is always a power of two, so it can be used to
+	 * construct mask with it when it is necessary to count remainder.
+	 *
+	 */
+	const size_t bytes_per_line = 1 << BYTES_PER_LINE_BASE;
+	char hash_text[(1 << BYTES_PER_LINE_BASE) * DIGITS_PER_BYTE +
+		LENGTH_OF_TERMINATING_ZERO_IN_BYTES];
+	const char hex_chars[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+				  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+	unsigned int i;
+
+	for (i = 0U; i < hash_size; ++i) {
+		hash_text[(i & (bytes_per_line - 1)) * DIGITS_PER_BYTE] =
+			hex_chars[hash[i] >> 4];
+		hash_text[(i & (bytes_per_line - 1)) * DIGITS_PER_BYTE + 1] =
+			hex_chars[hash[i] & 0x0f];
+		if (((i + 1) & (bytes_per_line - 1)) == 0U) {
+			hash_text[bytes_per_line * DIGITS_PER_BYTE] = '\0';
+			VERBOSE("hash part %u = %s\n",
+				(i >> BYTES_PER_LINE_BASE) + 1, hash_text);
+		}
+	}
+
+	leftover = (size_t)i & (bytes_per_line - 1);
+
+	if (leftover != 0UL) {
+		hash_text[leftover * DIGITS_PER_BYTE] = '\0';
+		VERBOSE("hash part %u = %s\n", (i >> BYTES_PER_LINE_BASE) + 1,
+			hash_text);
+	}
+}
+
+/*
+ * TODO: Have different error codes for different errors so that the caller can
+ * differentiate various error cases.
+ */
+int rmmd_attest_get_platform_token(uint64_t buf_pa, uint64_t *buf_len, uint64_t challenge_hash_len)
+{
+	int err;
+	uintptr_t va;
+	uint8_t temp_buf[SHA512_DIGEST_SIZE];
+
+	/*
+	 * TODO: Currently we don't validate incoming buf_pa. This is a
+	 * prototype and we will need to allocate static buffer for EL3-RMM
+	 * communication.
+	 */
+
+	/* We need a page of buffer to pass data */
+	if (*buf_len != PAGE_SIZE) {
+		ERROR("Invalid buffer length\n");
+		return RMMD_ERR_INVAL;
+	}
+
+	if ((challenge_hash_len != SHA256_DIGEST_SIZE) &&
+	    (challenge_hash_len != SHA384_DIGEST_SIZE) &&
+	    (challenge_hash_len != SHA512_DIGEST_SIZE)) {
+		ERROR("Invalid hash size: %lu\n", challenge_hash_len);
+		return RMMD_ERR_INVAL;
+	}
+
+	spin_lock(&lock);
+
+	/* Map the buffer that was provided by the RMM. */
+	err = mmap_add_dynamic_region_alloc_va(buf_pa, &va, PAGE_SIZE,
+					       MT_RW_DATA | MT_REALM);
+	if (err != 0) {
+		ERROR("mmap_add_dynamic_region_alloc_va failed: %d (%p).\n"
+		      , err, (void *)buf_pa);
+		spin_unlock(&lock);
+		return RMMD_ERR_NOMEM;
+	}
+
+	(void)memcpy(temp_buf, (void *)va, challenge_hash_len);
+
+	print_challenge((uint8_t *)temp_buf, challenge_hash_len);
+
+	/* Get the platform token. */
+	err = plat_get_cca_attest_token(va,
+		buf_len, (uintptr_t)temp_buf, challenge_hash_len);
+
+	if (err != 0) {
+		ERROR("Failed to get platform token: %d.\n", err);
+		err = RMMD_ERR_UNK;
+	}
+
+	/* Unmap RMM memory. */
+	(void)mmap_remove_dynamic_region(va, PAGE_SIZE);
+	spin_unlock(&lock);
+
+	return err;
+}
+
diff --git a/services/std_svc/rmmd/rmmd_main.c b/services/std_svc/rmmd/rmmd_main.c
index 7f4a010..c59e68a 100644
--- a/services/std_svc/rmmd/rmmd_main.c
+++ b/services/std_svc/rmmd/rmmd_main.c
@@ -372,6 +372,9 @@
 	case RMMD_GTSI_UNDELEGATE:
 		ret = gpt_undelegate_pas(x1, PAGE_SIZE_4KB, SMC_FROM_REALM);
 		SMC_RET1(handle, gpt_to_gts_error(ret, smc_fid, x1));
+	case RMMD_ATTEST_GET_PLAT_TOKEN:
+		ret = rmmd_attest_get_platform_token(x1, &x2, x3);
+		SMC_RET2(handle, ret, x2);
 	default:
 		WARN("RMMD: Unsupported RMM-EL3 call 0x%08x\n", smc_fid);
 		SMC_RET1(handle, SMC_UNK);
diff --git a/services/std_svc/rmmd/rmmd_private.h b/services/std_svc/rmmd/rmmd_private.h
index ca2c37c..d7ef4e1 100644
--- a/services/std_svc/rmmd/rmmd_private.h
+++ b/services/std_svc/rmmd/rmmd_private.h
@@ -51,6 +51,10 @@
 uint64_t rmmd_rmm_sync_entry(rmmd_rmm_context_t *ctx);
 __dead2 void rmmd_rmm_sync_exit(uint64_t rc);
 
+/* Functions implementing attestation utilities for RMM */
+int rmmd_attest_get_platform_token(uint64_t buf_pa, uint64_t *buf_len,
+				   uint64_t challenge_hash_len);
+
 /* Assembly helpers */
 uint64_t rmmd_rmm_enter(uint64_t *c_rt_ctx);
 void __dead2 rmmd_rmm_exit(uint64_t c_rt_ctx, uint64_t ret);