diff --git a/devicemodel/core/main.c b/devicemodel/core/main.c
index 1a70a0bef..e1bea1ea5 100644
--- a/devicemodel/core/main.c
+++ b/devicemodel/core/main.c
@@ -145,7 +145,7 @@ usage(int code)
 		"       %*s [--vtpm2 sock_path] [--virtio_poll interval] [--mac_seed seed_string]\n"
 		"       %*s [--vmcfg sub_options] [--dump vm_idx] [--debugexit] \n"
 		"       %*s [--logger-setting param_setting] [--pm_notify_channel]\n"
-		"       %*s [--psram psram_size]\n"
+		"       %*s [--psram]\n"
 		"       %*s [--pm_by_vuart vuart_node] <vm>\n"
 		"       -A: create ACPI tables\n"
 		"       -B: bootargs for kernel\n"
@@ -168,7 +168,7 @@ usage(int code)
 		"       --dump: show build-in VM configurations\n"
 #endif
 		"       --vsbl: vsbl file path\n"
-		"       --psram: <psram_size in MB> Allocate pSRAM of psram_size MB for this VM. This VM must be an RTVM\n"
+		"       --psram: Enable support for pSRAM for this VM. This VM must be an RTVM\n"
 		"       --ovmf: ovmf file path\n"
 		"       --cpu_affinity: list of pCPUs assigned to this VM\n"
 		"       --part_info: guest partition info file path\n"
@@ -794,7 +794,7 @@ static struct option long_options[] = {
 	{"vtpm2",		required_argument,	0, CMD_OPT_VTPM2},
 	{"lapic_pt",		no_argument,		0, CMD_OPT_LAPIC_PT},
 	{"rtvm",		no_argument,		0, CMD_OPT_RTVM},
-	{"psram",                no_argument,            0, CMD_OPT_PSRAM}, /* TODO: Need argument*/
+	{"psram",		no_argument,		0, CMD_OPT_PSRAM},
 	{"logger_setting",	required_argument,	0, CMD_OPT_LOGGER_SETTING},
 	{"pm_notify_channel",	required_argument,	0, CMD_OPT_PM_NOTIFY_CHANNEL},
 	{"pm_by_vuart",	required_argument,	0, CMD_OPT_PM_BY_VUART},
@@ -939,6 +939,7 @@ main(int argc, char *argv[])
 			is_rtvm = true;
 			break;
 		case CMD_OPT_PSRAM:
+			/* TODO: we need to support parameter to specify pSRAM size in the future */
 			pt_ptct = true;
 			break;
 		case CMD_OPT_ACPIDEV_PT:
diff --git a/devicemodel/core/sw_load_common.c b/devicemodel/core/sw_load_common.c
index 1f7588a54..860289c3b 100644
--- a/devicemodel/core/sw_load_common.c
+++ b/devicemodel/core/sw_load_common.c
@@ -271,7 +271,10 @@ acrn_create_e820_table(struct vmctx *ctx, struct e820_entry *e820)
 		/* Fix-Me: e820[LOWRAM_E820_ENTRY+2] can be used as RAM 
 			only when ctx->lowmem is higher than PSRAM area.
 			also, the length should be adjusted to ctx->lowmem-baseaddr */
+		/* TODO: this is a temporary workaround. needs further refine to remove the >=2G restriction */
+		assert(ctx->lowmem >= 2 * GB);
 		e820[LOWRAM_E820_ENTRY+2].type = E820_TYPE_RAM;
+
 	}
 
 	/* remove [5GB, highmem) if it's empty */
diff --git a/devicemodel/hw/platform/acpi/acpi.c b/devicemodel/hw/platform/acpi/acpi.c
index e0528607e..635d7731e 100644
--- a/devicemodel/hw/platform/acpi/acpi.c
+++ b/devicemodel/hw/platform/acpi/acpi.c
@@ -1093,8 +1093,9 @@ int create_and_inject_vptct(struct vmctx *ctx)
 		.type = VM_MMIO,
 		.gpa = PSRAM_BASE_GPA,
 		.hpa = PSRAM_BASE_HPA,
-		/* TODO: the .len should be set as the psram_size passed-in via the DM argument "psram <psram_size>"*/
-		.len = 0x208000UL,
+		/* Extra 32 KB is for PTCM binary image*/
+		/* TODO: .len should be psram_size+32kb. we need to modify guest E820 to adapt to real config */
+		.len = 0x400000U + 32 * KB,
 		.prot = PROT_ALL
 	};