diff --git a/src/soc/amd/common/block/lpc/lpc.c b/src/soc/amd/common/block/lpc/lpc.c
index 1fbff532fd..b8fb923c72 100644
--- a/src/soc/amd/common/block/lpc/lpc.c
+++ b/src/soc/amd/common/block/lpc/lpc.c
@@ -117,11 +117,8 @@ static void lpc_read_resources(struct device *dev)
 		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
 
 	/* Only up to 16 MByte of the SPI flash can be mapped right below 4 GB */
-	res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
-	res->base = FLASH_BELOW_4GB_MAPPING_REGION_BASE;
-	res->size = FLASH_BELOW_4GB_MAPPING_REGION_SIZE;
-	res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE |
-		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+	mmio_range(dev, 1, FLASH_BELOW_4GB_MAPPING_REGION_BASE,
+		   FLASH_BELOW_4GB_MAPPING_REGION_SIZE);
 
 	/* Add a memory resource for the SPI BAR. */
 	mmio_range(dev, 2, SPI_BASE_ADDRESS, 1 * KiB);