diff --git a/src/soc/qualcomm/ipq40xx/soc.c b/src/soc/qualcomm/ipq40xx/soc.c
index c99ae6f2d1..f482cff30b 100644
--- a/src/soc/qualcomm/ipq40xx/soc.c
+++ b/src/soc/qualcomm/ipq40xx/soc.c
@@ -5,6 +5,7 @@
 #include <symbols.h>
 #include <soc/ipq_uart.h>
 
+/* CONFIG_DRAM_SIZE_MB effectively extends hlos2. */
 typedef struct {
 	uint8_t	hlos1[112 * MiB],	/* <-- 0x80000000 */
 		appsbl[4 * MiB],	/* <-- 0x87000000 */
@@ -13,34 +14,17 @@ typedef struct {
 		hlos2[128 * MiB];	/* <-- 0x88000000 */
 } ipq_mem_map_t;
 
-#define LINUX_REGION1_START	((uintptr_t)(ipq_mem_map->hlos1))
-#define LINUX_REGION1_START_KB	(LINUX_REGION1_START / KiB)
-#define LINUX_REGION1_SIZE	(sizeof(ipq_mem_map->hlos1) +	\
-				 sizeof(ipq_mem_map->appsbl) +	\
-				 sizeof(ipq_mem_map->sbl))
-#define LINUX_REGION1_SIZE_KB	(LINUX_REGION1_SIZE / KiB)
-
-#define RESERVED_START		((uintptr_t)(ipq_mem_map->rsvd))
-#define RESERVED_START_KB	(RESERVED_START / KiB)
-#define RESERVED_SIZE		(sizeof(ipq_mem_map->rsvd))
-#define RESERVED_SIZE_KB	(RESERVED_SIZE / KiB)
-
-/* xxx_SIZE defines not needed since it goes till end of memory */
-#define LINUX_REGION2_START	((uintptr_t)(ipq_mem_map->hlos2))
-#define LINUX_REGION2_START_KB	(LINUX_REGION2_START / KiB)
-
 static void soc_read_resources(struct device *dev)
 {
 	ipq_mem_map_t *ipq_mem_map = ((ipq_mem_map_t *)_dram);
+	uint64_t ram_end = (uintptr_t)_dram + CONFIG_DRAM_SIZE_MB * (uint64_t)MiB;
 
-	ram_resource_kb(dev, 0, LINUX_REGION1_START_KB, LINUX_REGION1_SIZE_KB);
-
-	reserved_ram_resource_kb(dev, 1, RESERVED_START_KB, RESERVED_SIZE_KB);
+	ram_from_to(dev, 0, (uintptr_t)ipq_mem_map->hlos1, (uintptr_t)ipq_mem_map->rsvd);
+	reserved_ram_from_to(dev, 1, (uintptr_t)ipq_mem_map->rsvd,
+			     (uintptr_t)ipq_mem_map->hlos2);
 
 	/* 0x88000000 to end, is the second region for Linux */
-	ram_resource_kb(dev, 2, LINUX_REGION2_START_KB,
-		     (CONFIG_DRAM_SIZE_MB * KiB) -
-			LINUX_REGION1_SIZE_KB - RESERVED_SIZE_KB);
+	ram_from_to(dev, 2, (uintptr_t)ipq_mem_map->hlos2, ram_end);
 }
 
 static void soc_init(struct device *dev)