diff --git a/arch/arm/mach-uniphier/dram_init.c b/arch/arm/mach-uniphier/dram_init.c
index cb35dab..f678114 100644
--- a/arch/arm/mach-uniphier/dram_init.c
+++ b/arch/arm/mach-uniphier/dram_init.c
@@ -238,6 +238,13 @@ int dram_init(void)
 		gd->ram_size += dram_map[i].size;
 	}
 
+	/*
+	 * LD20 uses the last 64 byte for each channel for dynamic
+	 * DDR PHY training
+	 */
+	if (uniphier_get_soc_id() == UNIPHIER_LD20_ID)
+		gd->ram_size -= 64;
+
 	return 0;
 }
 
diff --git a/include/configs/uniphier.h b/include/configs/uniphier.h
index 12cbe9b..5ab06f6 100644
--- a/include/configs/uniphier.h
+++ b/include/configs/uniphier.h
@@ -215,8 +215,6 @@
 
 #define CONFIG_SYS_SDRAM_BASE		0x80000000
 #define CONFIG_NR_DRAM_BANKS		3
-/* for LD20; the last 64 byte is used for dynamic DDR PHY training */
-#define CONFIG_SYS_MEM_TOP_HIDE		64
 
 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_TEXT_BASE)