Index: sys/arm64/arm64/machdep.c
===================================================================
--- sys/arm64/arm64/machdep.c
+++ sys/arm64/arm64/machdep.c
@@ -83,6 +83,7 @@
 #endif
 
 #ifdef FDT
+#include <dev/fdt/fdt_common.h>
 #include <dev/ofw/openfirm.h>
 #endif
 
@@ -668,6 +669,20 @@
 	return (1);
 }
 
+#ifdef FDT
+static void
+add_fdt_mem_regions(struct mem_region *mr, int mrcnt, vm_paddr_t *physmap,
+    u_int *physmap_idxp)
+{
+
+	for (int i = 0; i < mrcnt; i++) {
+		if (!add_physmap_entry(mr[i].mr_start, mr[i].mr_size, physmap,
+		    physmap_idxp))
+			break;
+	}
+}
+#endif
+
 #define efi_next_descriptor(ptr, size) \
 	((struct efi_md *)(((uint8_t *) ptr) + size))
 
@@ -807,6 +822,11 @@
 {
 	struct efi_map_header *efihdr;
 	struct pcpu *pcpup;
+#ifdef FDT
+	struct mem_region mem_regions[FDT_MEM_REGIONS];
+	u_long memsize;
+	int mem_regions_sz;
+#endif
 	vm_offset_t lastaddr;
 	caddr_t kmdp;
 	vm_paddr_t mem_len;
@@ -834,7 +854,18 @@
 	physmap_idx = 0;
 	efihdr = (struct efi_map_header *)preload_search_info(kmdp,
 	    MODINFO_METADATA | MODINFOMD_EFI_MAP);
-	add_efi_map_entries(efihdr, physmap, &physmap_idx);
+	if (efihdr)
+		add_efi_map_entries(efihdr, physmap, &physmap_idx);
+#ifdef FDT
+	else {
+		/* Grab physical memory regions information from device tree. */
+		if (fdt_get_mem_regions(mem_regions, &mem_regions_sz,
+		    &memsize) != 0)
+			panic("Cannot get physical memory regions");
+		add_fdt_mem_regions(mem_regions, mem_regions_sz, physmap,
+		    &physmap_idx);
+	}
+#endif
 
 	/* Print the memory map */
 	mem_len = 0;
Index: sys/arm64/conf/GENERIC
===================================================================
--- sys/arm64/conf/GENERIC
+++ sys/arm64/conf/GENERIC
@@ -121,6 +121,7 @@
 
 # Serial (COM) ports
 device		uart		# Generic UART driver
+device		uart_ns8250
 device		pl011
 
 # USB support
Index: sys/dev/uart/uart_cpu_fdt.c
===================================================================
--- sys/dev/uart/uart_cpu_fdt.c
+++ sys/dev/uart/uart_cpu_fdt.c
@@ -162,8 +162,15 @@
 					break;
 			}
 		}
-		if (chosen == -1 || *name == NULL)
-			node = OF_finddevice("serial0"); /* Last ditch */
+		if (chosen == -1 || *name == NULL) {
+			/*
+			 * If chosen node is not available then we will use
+			 * the first serial0 or uart0 node in device tree.
+			 */
+			node = OF_finddevice("serial0");
+			if (node == -1)
+				node = OF_finddevice("/soc/uart0");
+		}
 	} else {
 		node = OF_finddevice(cp);
 	}
Index: sys/dev/uart/uart_dev_ns8250.c
===================================================================
--- sys/dev/uart/uart_dev_ns8250.c
+++ sys/dev/uart/uart_dev_ns8250.c
@@ -397,6 +397,7 @@
 #ifdef FDT
 static struct ofw_compat_data compat_data[] = {
 	{"ns16550",		(uintptr_t)&uart_ns8250_class},
+	{"ns16550a",		(uintptr_t)&uart_ns8250_class},
 	{"snps,dw-apb-uart",	(uintptr_t)&uart_ns8250_class},
 	{NULL,			(uintptr_t)NULL},
 };