diff --git a/arch/arm/cpu/armv8/imx8m/soc.c b/arch/arm/cpu/armv8/imx8m/soc.c
index f326562..858970d 100644
--- a/arch/arm/cpu/armv8/imx8m/soc.c
+++ b/arch/arm/cpu/armv8/imx8m/soc.c
@@ -229,9 +229,9 @@
 			reg = 0x21;
 		} else {
 			uint32_t rom_version;
-			rom_version = readl((void __iomem *)0x800);
+			rom_version = readb((void __iomem *)0x800);
 			if (rom_version != 0x10) {
-				rom_version = readl((void __iomem *)0x83c);
+				rom_version = readb((void __iomem *)0x83c);
 				if (rom_version == 0x20)
 					reg = 0x20;
 			}