diff --git a/src/mainboard/emulation/qemu-power9/mainboard.c b/src/mainboard/emulation/qemu-power9/mainboard.c
index 542339da0a..5af49247e0 100644
--- a/src/mainboard/emulation/qemu-power9/mainboard.c
+++ b/src/mainboard/emulation/qemu-power9/mainboard.c
@@ -8,7 +8,7 @@ static void mainboard_enable(struct device *dev)
 {
 	if (!dev)
 		die("No dev0; die\n");
-	ram_resource_kb(dev, 0, 0, (unsigned long)cbmem_top() / KiB);
+	ram_range(dev, 0, 0, (unsigned long)cbmem_top());
 }
 
 struct chip_operations mainboard_ops = {
diff --git a/src/mainboard/emulation/qemu-riscv/mainboard.c b/src/mainboard/emulation/qemu-riscv/mainboard.c
index af0df9c9b4..f0f0740484 100644
--- a/src/mainboard/emulation/qemu-riscv/mainboard.c
+++ b/src/mainboard/emulation/qemu-riscv/mainboard.c
@@ -14,7 +14,7 @@ static void mainboard_enable(struct device *dev)
 	}
 
 	dram_mb_detected = probe_ramsize((uintptr_t)_dram, CONFIG_DRAM_SIZE_MB);
-	ram_resource_kb(dev, 0, (uintptr_t)_dram / KiB, dram_mb_detected * MiB / KiB);
+	ram_range(dev, 0, (uintptr_t)_dram, dram_mb_detected * MiB);
 }
 
 struct chip_operations mainboard_ops = {
diff --git a/src/mainboard/emulation/spike-riscv/mainboard.c b/src/mainboard/emulation/spike-riscv/mainboard.c
index 2454f0462f..a3857f8262 100644
--- a/src/mainboard/emulation/spike-riscv/mainboard.c
+++ b/src/mainboard/emulation/spike-riscv/mainboard.c
@@ -17,7 +17,7 @@ static void mainboard_enable(struct device *dev)
 		die("No dev0; die\n");
 	}
 
-	ram_resource_kb(dev, 0, 0x80000000/KiB, ram_size/KiB);
+	ram_range(dev, 0, 0x80000000, ram_size);
 }
 
 struct chip_operations mainboard_ops = {
diff --git a/src/mainboard/sifive/hifive-unleashed/mainboard.c b/src/mainboard/sifive/hifive-unleashed/mainboard.c
index 9dde848406..90090d0f72 100644
--- a/src/mainboard/sifive/hifive-unleashed/mainboard.c
+++ b/src/mainboard/sifive/hifive-unleashed/mainboard.c
@@ -6,7 +6,7 @@
 
 static void mainboard_enable(struct device *dev)
 {
-	ram_resource_kb(dev, 0, (uintptr_t)_dram/KiB, sdram_size_mb()*KiB);
+	ram_range(dev, 0, (uintptr_t)_dram, sdram_size_mb());
 }
 
 struct chip_operations mainboard_ops = {