diff --git a/hw/ppc/ppc405.h b/hw/ppc/ppc405.h
index 756865621b..ca0972b88b 100644
--- a/hw/ppc/ppc405.h
+++ b/hw/ppc/ppc405.h
@@ -167,9 +167,7 @@ struct Ppc405SoCState {
     DeviceState parent_obj;
 
     /* Public */
-    MemoryRegion ram_banks[2];
-    hwaddr ram_bases[2], ram_sizes[2];
-
+    Ppc4xxSdramBank ram_banks[2];
     MemoryRegion *dram_mr;
     hwaddr ram_size;
 
diff --git a/hw/ppc/ppc405_uc.c b/hw/ppc/ppc405_uc.c
index 1e02347e57..bcbf35bc14 100644
--- a/hw/ppc/ppc405_uc.c
+++ b/hw/ppc/ppc405_uc.c
@@ -1074,14 +1074,14 @@ static void ppc405_soc_realize(DeviceState *dev, Error **errp)
 
     /* SDRAM controller */
         /* XXX 405EP has no ECC interrupt */
-    s->ram_bases[0] = 0;
-    s->ram_sizes[0] = s->ram_size;
-    memory_region_init_alias(&s->ram_banks[0], OBJECT(s),
+    s->ram_banks[0].base = 0;
+    s->ram_banks[0].size = s->ram_size;
+    memory_region_init_alias(&s->ram_banks[0].ram, OBJECT(s),
                              "ppc405.sdram0", s->dram_mr,
-                             s->ram_bases[0], s->ram_sizes[0]);
+                             s->ram_banks[0].base, s->ram_banks[0].size);
 
     ppc4xx_sdram_init(env, qdev_get_gpio_in(DEVICE(&s->uic), 17), 1,
-                      s->ram_banks, s->ram_bases, s->ram_sizes);
+                      s->ram_banks);
 
     /* External bus controller */
     if (!ppc4xx_dcr_realize(PPC4xx_DCR_DEVICE(&s->ebc), &s->cpu, errp)) {
diff --git a/hw/ppc/ppc440.h b/hw/ppc/ppc440.h
index 7cef936125..e6c905b7d6 100644
--- a/hw/ppc/ppc440.h
+++ b/hw/ppc/ppc440.h
@@ -11,14 +11,13 @@
 #ifndef PPC440_H
 #define PPC440_H
 
-#include "hw/ppc/ppc.h"
+#include "hw/ppc/ppc4xx.h"
 
 void ppc4xx_l2sram_init(CPUPPCState *env);
 void ppc4xx_cpr_init(CPUPPCState *env);
 void ppc4xx_sdr_init(CPUPPCState *env);
 void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       MemoryRegion *ram_memories,
-                       hwaddr *ram_bases, hwaddr *ram_sizes,
+                       Ppc4xxSdramBank *ram_banks,
                        int do_init);
 void ppc4xx_ahb_init(CPUPPCState *env);
 void ppc4xx_dma_init(CPUPPCState *env, int dcr_base);
diff --git a/hw/ppc/ppc440_bamboo.c b/hw/ppc/ppc440_bamboo.c
index e3412c4fcd..2aac8a3fe9 100644
--- a/hw/ppc/ppc440_bamboo.c
+++ b/hw/ppc/ppc440_bamboo.c
@@ -168,9 +168,8 @@ static void bamboo_init(MachineState *machine)
     unsigned int pci_irq_nrs[4] = { 28, 27, 26, 25 };
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *isa = g_new(MemoryRegion, 1);
-    MemoryRegion *ram_memories = g_new(MemoryRegion, PPC440EP_SDRAM_NR_BANKS);
-    hwaddr ram_bases[PPC440EP_SDRAM_NR_BANKS] = {0};
-    hwaddr ram_sizes[PPC440EP_SDRAM_NR_BANKS] = {0};
+    Ppc4xxSdramBank *ram_banks = g_new0(Ppc4xxSdramBank,
+                                        PPC440EP_SDRAM_NR_BANKS);
     PCIBus *pcibus;
     PowerPCCPU *cpu;
     CPUPPCState *env;
@@ -205,13 +204,11 @@ static void bamboo_init(MachineState *machine)
                        qdev_get_gpio_in(DEVICE(cpu), PPC40x_INPUT_CINT));
 
     /* SDRAM controller */
-    ppc4xx_sdram_banks(machine->ram, PPC440EP_SDRAM_NR_BANKS, ram_memories,
-                       ram_bases, ram_sizes, ppc440ep_sdram_bank_sizes);
+    ppc4xx_sdram_banks(machine->ram, PPC440EP_SDRAM_NR_BANKS, ram_banks,
+                       ppc440ep_sdram_bank_sizes);
     /* XXX 440EP's ECC interrupts are on UIC1, but we've only created UIC0. */
-    ppc4xx_sdram_init(env,
-                      qdev_get_gpio_in(uicdev, 14),
-                      PPC440EP_SDRAM_NR_BANKS, ram_memories,
-                      ram_bases, ram_sizes);
+    ppc4xx_sdram_init(env, qdev_get_gpio_in(uicdev, 14),
+                      PPC440EP_SDRAM_NR_BANKS, ram_banks);
     /* Enable SDRAM memory regions, this should be done by the firmware */
     if (ppc_dcr_write(env->dcr_env, SDRAM0_CFGADDR, 0x20) ||
         ppc_dcr_write(env->dcr_env, SDRAM0_CFGDATA, 0x80000000)) {
diff --git a/hw/ppc/ppc440_uc.c b/hw/ppc/ppc440_uc.c
index 6ab0ad7985..5db59d1190 100644
--- a/hw/ppc/ppc440_uc.c
+++ b/hw/ppc/ppc440_uc.c
@@ -690,8 +690,7 @@ static void sdram_reset(void *opaque)
 }
 
 void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       MemoryRegion *ram_memories,
-                       hwaddr *ram_bases, hwaddr *ram_sizes,
+                       Ppc4xxSdramBank *ram_banks,
                        int do_init)
 {
     ppc440_sdram_t *sdram;
@@ -700,9 +699,9 @@ void ppc440_sdram_init(CPUPPCState *env, int nbanks,
     sdram = g_malloc0(sizeof(*sdram));
     sdram->nbanks = nbanks;
     for (i = 0; i < nbanks; i++) {
-        sdram->bank[i].ram = ram_memories[i];
-        sdram->bank[i].base = ram_bases[i];
-        sdram->bank[i].size = ram_sizes[i];
+        sdram->bank[i].ram = ram_banks[i].ram;
+        sdram->bank[i].base = ram_banks[i].base;
+        sdram->bank[i].size = ram_banks[i].size;
     }
     qemu_register_reset(&sdram_reset, sdram);
     ppc_dcr_register(env, SDRAM0_CFGADDR,
diff --git a/hw/ppc/ppc4xx_devs.c b/hw/ppc/ppc4xx_devs.c
index 936d6f77fe..7bdcbd6fac 100644
--- a/hw/ppc/ppc4xx_devs.c
+++ b/hw/ppc/ppc4xx_devs.c
@@ -343,9 +343,7 @@ static void sdram_reset(void *opaque)
 }
 
 void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks,
-                       MemoryRegion *ram_memories,
-                       hwaddr *ram_bases,
-                       hwaddr *ram_sizes)
+                       Ppc4xxSdramBank *ram_banks)
 {
     ppc4xx_sdram_t *sdram;
     int i;
@@ -354,9 +352,9 @@ void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks,
     sdram->irq = irq;
     sdram->nbanks = nbanks;
     for (i = 0; i < nbanks; i++) {
-        sdram->bank[i].ram = ram_memories[i];
-        sdram->bank[i].base = ram_bases[i];
-        sdram->bank[i].size = ram_sizes[i];
+        sdram->bank[i].ram = ram_banks[i].ram;
+        sdram->bank[i].base = ram_banks[i].base;
+        sdram->bank[i].size = ram_banks[i].size;
     }
     qemu_register_reset(&sdram_reset, sdram);
     ppc_dcr_register(env, SDRAM0_CFGADDR,
@@ -376,8 +374,7 @@ void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks,
  * sizes varies by SoC.
  */
 void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks,
-                        MemoryRegion ram_memories[],
-                        hwaddr ram_bases[], hwaddr ram_sizes[],
+                        Ppc4xxSdramBank ram_banks[],
                         const ram_addr_t sdram_bank_sizes[])
 {
     ram_addr_t size_left = memory_region_size(ram);
@@ -392,13 +389,13 @@ void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks,
             if (bank_size <= size_left) {
                 char name[32];
 
-                ram_bases[i] = base;
-                ram_sizes[i] = bank_size;
+                ram_banks[i].base = base;
+                ram_banks[i].size = bank_size;
                 base += bank_size;
                 size_left -= bank_size;
                 snprintf(name, sizeof(name), "ppc4xx.sdram%d", i);
-                memory_region_init_alias(&ram_memories[i], NULL, name, ram,
-                                         ram_bases[i], ram_sizes[i]);
+                memory_region_init_alias(&ram_banks[i].ram, NULL, name, ram,
+                                         ram_banks[i].base, ram_banks[i].size);
                 break;
             }
         }
diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
index 850bb3b817..f4c2a693fb 100644
--- a/hw/ppc/sam460ex.c
+++ b/hw/ppc/sam460ex.c
@@ -73,7 +73,6 @@
 #define OPB_FREQ 115000000
 #define EBC_FREQ 115000000
 #define UART_FREQ 11059200
-#define SDRAM_NR_BANKS 4
 
 /* The SoC could also handle 4 GiB but firmware does not work with that. */
 /* Maybe it overflows a signed 32 bit number somewhere? */
@@ -274,9 +273,7 @@ static void sam460ex_init(MachineState *machine)
 {
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *isa = g_new(MemoryRegion, 1);
-    MemoryRegion *ram_memories = g_new(MemoryRegion, SDRAM_NR_BANKS);
-    hwaddr ram_bases[SDRAM_NR_BANKS] = {0};
-    hwaddr ram_sizes[SDRAM_NR_BANKS] = {0};
+    Ppc4xxSdramBank *ram_banks = g_new0(Ppc4xxSdramBank, 1);
     MemoryRegion *l2cache_ram = g_new(MemoryRegion, 1);
     DeviceState *uic[4];
     int i;
@@ -345,20 +342,18 @@ static void sam460ex_init(MachineState *machine)
     /* SDRAM controller */
     /* put all RAM on first bank because board has one slot
      * and firmware only checks that */
-    ppc4xx_sdram_banks(machine->ram, 1, ram_memories, ram_bases, ram_sizes,
-                       ppc460ex_sdram_bank_sizes);
+    ppc4xx_sdram_banks(machine->ram, 1, ram_banks, ppc460ex_sdram_bank_sizes);
 
     /* FIXME: does 460EX have ECC interrupts? */
-    ppc440_sdram_init(env, SDRAM_NR_BANKS, ram_memories,
-                      ram_bases, ram_sizes, 1);
+    ppc440_sdram_init(env, 1, ram_banks, 1);
 
     /* IIC controllers and devices */
     dev = sysbus_create_simple(TYPE_PPC4xx_I2C, 0x4ef600700,
                                qdev_get_gpio_in(uic[0], 2));
     i2c = PPC4xx_I2C(dev)->bus;
     /* SPD EEPROM on RAM module */
-    spd_data = spd_data_generate(ram_sizes[0] < 128 * MiB ? DDR : DDR2,
-                                 ram_sizes[0]);
+    spd_data = spd_data_generate(ram_banks->size < 128 * MiB ? DDR : DDR2,
+                                 ram_banks->size);
     spd_data[20] = 4; /* SO-DIMM module */
     smbus_eeprom_init_one(i2c, 0x50, spd_data);
     /* RTC */
diff --git a/include/hw/ppc/ppc4xx.h b/include/hw/ppc/ppc4xx.h
index a5e6c185af..5013b8bf3a 100644
--- a/include/hw/ppc/ppc4xx.h
+++ b/include/hw/ppc/ppc4xx.h
@@ -43,14 +43,11 @@ enum {
 };
 
 void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks,
-                        MemoryRegion ram_memories[],
-                        hwaddr ram_bases[], hwaddr ram_sizes[],
+                        Ppc4xxSdramBank ram_banks[],
                         const ram_addr_t sdram_bank_sizes[]);
 
-void ppc4xx_sdram_init (CPUPPCState *env, qemu_irq irq, int nbanks,
-                        MemoryRegion ram_memories[],
-                        hwaddr *ram_bases,
-                        hwaddr *ram_sizes);
+void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks,
+                       Ppc4xxSdramBank *ram_banks);
 
 #define TYPE_PPC4xx_PCI_HOST_BRIDGE "ppc4xx-pcihost"
 
