diff --git a/arch/sh/kernel/cpu/sh4a/setup-shx3.c b/arch/sh/kernel/cpu/sh4a/setup-shx3.c
index 7f3fa5167c6b4a5ba7dc53964ef6114b0e56babf..f7a2cc221d22b864ef21611b67c93b3976f8442f 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-shx3.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-shx3.c
@@ -255,3 +255,17 @@ void __init plat_irq_setup(void)
 {
 	register_intc_controller(&intc_desc);
 }
+
+void __init plat_mem_setup(void)
+{
+	/* Register CPU#0 URAM space as Node 1 */
+	setup_bootmem_node(1, 0x145f0000, 0x14610000);	/* CPU0 */
+
+#if 0
+	/* XXX: Not yet.. */
+	setup_bootmem_node(2, 0x14df0000, 0x14e10000);	/* CPU1 */
+	setup_bootmem_node(3, 0x155f0000, 0x15610000);	/* CPU2 */
+	setup_bootmem_node(4, 0x15df0000, 0x15e10000);	/* CPU3 */
+	setup_bootmem_node(5, 0x16000000, 0x16020000);	/* CSM */
+#endif
+}
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index d1a7e3f7b4ae2a55fd3a77edd49d4462a2abc4ee..eca68da7c0ab5893dd2874412878fce8c65a8ff3 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -198,6 +198,8 @@ config CPU_SUBTYPE_SHX3
 	select CPU_SH4A
 	select CPU_SHX3
 	select CPU_HAS_INTC_IRQ
+	select ARCH_SPARSEMEM_ENABLE
+	select SYS_SUPPORTS_NUMA
 
 # SH4AL-DSP Processor Support
 
@@ -323,6 +325,7 @@ config ARCH_SPARSEMEM_DEFAULT
 
 config MAX_ACTIVE_REGIONS
 	int
+	default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
 	default "2" if (CPU_SUBTYPE_SH7722 && SPARSEMEM)
 	default "1"