diff --git a/doc/fwts.1 b/doc/fwts.1
index 234278d..a12aca9 100644
--- a/doc/fwts.1
+++ b/doc/fwts.1
@@ -201,6 +201,10 @@ no pretty printing of horizontal separators in the results log file.
 specify the results output log file.
 One can also specify stdout and stderr to redirect to these output streams.
 .TP
+.B \-R, \-\-rsdp=physaddr
+specify the physical address of ACPI RSDP. This is useful on some systems where
+it cannot be automatically detected.
+.TP
 .B \-\-s3\-delay\-delta=N
 time to be added onto delay between each S3 iteration.
 .TP
diff --git a/src/lib/include/fwts_framework.h b/src/lib/include/fwts_framework.h
index f365d74..1e5171c 100644
--- a/src/lib/include/fwts_framework.h
+++ b/src/lib/include/fwts_framework.h
@@ -144,6 +144,7 @@ typedef struct {
 	fwts_list errors_filter_discard;	/* Results to discard, empty = discard none */
 	bool error_filtered_out;		/* True if a klog message has been filtered out */
 	fwts_acpica_mode acpica_mode;		/* ACPICA mode flags */
+	void *rsdp;				/* ACPI RSDP address */
 } fwts_framework;
 
 typedef struct {
diff --git a/src/lib/src/fwts_acpi_tables.c b/src/lib/src/fwts_acpi_tables.c
index 6f1e964..0549d1b 100644
--- a/src/lib/src/fwts_acpi_tables.c
+++ b/src/lib/src/fwts_acpi_tables.c
@@ -52,6 +52,34 @@ static void *fwts_acpi_find_rsdp_efi(void)
 }
 
 /*
+ *  fwts_acpi_find_rsdp_klog()
+ *	Get RSDP by parsing kernel log
+ */
+static void *fwts_acpi_find_rsdp_klog(void)
+{
+	fwts_list *klog;
+	fwts_list_link *item;
+	void *rsdp = NULL;
+
+	if ((klog = fwts_klog_read()) == NULL)
+		return NULL;
+
+	fwts_list_foreach(item, klog) {
+		char *text = fwts_text_list_text(item);
+		char *ptr = strstr(text, "ACPI: RSDP");
+
+		if (ptr) {
+			rsdp = (void *)strtoul(ptr + 11, NULL, 16);
+			break;
+		}
+	}
+
+	fwts_text_list_free(klog);
+
+	return rsdp;
+}
+
+/*
  *  fwts_acpi_find_rsdp_bios()
  *	Find RSDP address by scanning BIOS memory
  */
@@ -94,21 +122,26 @@ static void *fwts_acpi_find_rsdp_bios(void)
 static fwts_acpi_table_rsdp *fwts_acpi_get_rsdp(void *addr, size_t *rsdp_len)
 {
 	uint8_t *mem;
-	fwts_acpi_table_rsdp *rsdp;
+	fwts_acpi_table_rsdp *rsdp = NULL;
 	*rsdp_len = 0;
 
 	if ((mem = fwts_mmap((off_t)addr, sizeof(fwts_acpi_table_rsdp))) == FWTS_MAP_FAILED)
 		return NULL;
 
-	/* Determine original RSDP size from revision. */
 	rsdp = (fwts_acpi_table_rsdp*)mem;
+	/* Determine original RSDP size from revision. */
 	*rsdp_len = (rsdp->revision < 1) ? 20 : 36;
 
+	/* Must have the correct signature */
+	if (strncmp(rsdp->signature, "RSD PTR ", 8))
+		goto out;
+
 	/* Assume version 2.0 size, we don't care about a few bytes over allocation if it's version 1.0 */
 	if ((rsdp = (fwts_acpi_table_rsdp*)fwts_low_calloc(1, sizeof(fwts_acpi_table_rsdp))) == NULL)
-		return NULL;
+		goto out;
 
 	memcpy(rsdp, mem, *rsdp_len);
+out:
 	(void)fwts_munmap(mem, sizeof(fwts_acpi_table_rsdp));
 
 	return rsdp;
@@ -238,22 +271,33 @@ static void fwts_acpi_handle_fadt(fwts_acpi_table_fadt *fadt, fwts_acpi_table_pr
  *  fwts_acpi_load_tables_from_firmware()
  *  	Load up cached copies of all the ACPI tables
  */
-static int fwts_acpi_load_tables_from_firmware(void)
+static int fwts_acpi_load_tables_from_firmware(fwts_framework *fw)
 {
 	fwts_acpi_table_rsdp *rsdp;
 	fwts_acpi_table_xsdt *xsdt;
 	fwts_acpi_table_rsdt *rsdt;
 	fwts_acpi_table_header *header;
 
-	void *	rsdp_addr;
+	void *	rsdp_addr = NULL;
 	size_t	rsdp_len;
 	int 	num_entries;
 	int 	i;
 
-	/* Check for RSDP in EFI, then BIOS, if not found, give up */
-	if ((rsdp_addr = fwts_acpi_find_rsdp_efi()) == NULL)
-		if ((rsdp_addr = fwts_acpi_find_rsdp_bios()) == NULL)
-			return FWTS_ERROR;
+	/* Check for RSDP as EFI, then BIOS, parsed klog, if not found, give up */
+	if (fw->rsdp)
+		rsdp_addr = (void*)fw->rsdp;
+	if (!rsdp_addr)
+		rsdp_addr = fwts_acpi_find_rsdp_efi();
+	if (!rsdp_addr)
+		rsdp_addr = fwts_acpi_find_rsdp_bios();
+	if (!rsdp_addr)
+		rsdp_addr = fwts_acpi_find_rsdp_klog();
+	if (!rsdp_addr)
+		return FWTS_ERROR;
+
+	/* Must be on a 16 byte boundary */
+	if (((uint64_t)rsdp_addr & 0xf))
+		return FWTS_ERROR;
 
 	/* Load and save cached RSDP */
 	if ((rsdp = fwts_acpi_get_rsdp(rsdp_addr, &rsdp_len)) == NULL)
@@ -712,7 +756,7 @@ int fwts_acpi_load_tables(fwts_framework *fw)
 	else if (fw->acpi_table_acpidump_file != NULL)
 		ret = fwts_acpi_load_tables_from_acpidump(fw);
 	else if (fwts_check_root_euid(fw, true) == FWTS_OK)
-		ret = fwts_acpi_load_tables_from_firmware();
+		ret = fwts_acpi_load_tables_from_firmware(fw);
 	else
 		ret = FWTS_ERROR_NO_PRIV;
 
diff --git a/src/lib/src/fwts_framework.c b/src/lib/src/fwts_framework.c
index eae5907..92aa74d 100644
--- a/src/lib/src/fwts_framework.c
+++ b/src/lib/src/fwts_framework.c
@@ -83,6 +83,7 @@ static fwts_option fwts_framework_options[] = {
 	{ "acpica-debug",	"",   0, "Enable ACPICA debug/warning messages." },
 	{ "acpica",		"",   1, "Enable ACPICA run time options." },
 	{ "uefi",		"",   0, "Run UEFI tests." },
+	{ "rsdp",		"R:", 1, "Specify the physical address of the ACPI RSDP." },
 	{ NULL, NULL, 0, NULL }
 };
 
@@ -1138,6 +1139,9 @@ int fwts_framework_options_handler(fwts_framework *fw, int argc, char * const ar
 		case 38: /* --uefi */
 			fw->flags |= FWTS_FLAG_TEST_UEFI;
 			break;
+		case 39: /* --rsdp */
+			fw->rsdp = (void *)strtoul(optarg, NULL, 0);
+			break;
 		}
 		break;
 	case 'a': /* --all */
@@ -1214,6 +1218,9 @@ int fwts_framework_options_handler(fwts_framework *fw, int argc, char * const ar
 	case 'w': /* --log-width=N */
 		fwts_log_set_line_width(atoi(optarg));
 		break;
+	case 'R': /* --rsdp=addr */
+		fw->rsdp = (void *)strtoul(optarg, NULL, 0);
+		break;
 	}
 	return FWTS_OK;
 }
