diff --git a/hw/ppc/mpc8544_guts.c b/hw/ppc/mpc8544_guts.c
index e8d2d51c20c0..a26e83d0484b 100644
--- a/hw/ppc/mpc8544_guts.c
+++ b/hw/ppc/mpc8544_guts.c
@@ -19,6 +19,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/module.h"
+#include "qemu/log.h"
 #include "sysemu/runstate.h"
 #include "cpu.h"
 #include "hw/sysbus.h"
@@ -82,7 +83,9 @@ static uint64_t mpc8544_guts_read(void *opaque, hwaddr addr,
         value = env->spr[SPR_E500_SVR];
         break;
     default:
-        fprintf(stderr, "guts: Unknown register read: %x\n", (int)addr);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Unknown register 0x%" HWADDR_PRIx "\n",
+                      __func__, addr);
         break;
     }
 
@@ -101,8 +104,8 @@ static void mpc8544_guts_write(void *opaque, hwaddr addr,
         }
         break;
     default:
-        fprintf(stderr, "guts: Unknown register write: %x = %x\n",
-                (int)addr, (unsigned)value);
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Unknown register 0x%" HWADDR_PRIx
+                       " = 0x%" PRIx64 "\n", __func__, addr, value);
         break;
     }
 }
diff --git a/hw/ppc/ppc4xx_devs.c b/hw/ppc/ppc4xx_devs.c
index 980c48944fc7..e7d82ae5016c 100644
--- a/hw/ppc/ppc4xx_devs.c
+++ b/hw/ppc/ppc4xx_devs.c
@@ -35,14 +35,7 @@
 #include "exec/address-spaces.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
-
-/*#define DEBUG_UIC*/
-
-#ifdef DEBUG_UIC
-#  define LOG_UIC(...) qemu_log_mask(CPU_LOG_INT, ## __VA_ARGS__)
-#else
-#  define LOG_UIC(...) do { } while (0)
-#endif
+#include "trace.h"
 
 static void ppc4xx_reset(void *opaque)
 {
@@ -137,8 +130,9 @@ static uint32_t sdram_bcr (hwaddr ram_base,
         bcr = 0x000C0000;
         break;
     default:
-        printf("%s: invalid RAM size " TARGET_FMT_plx "\n", __func__,
-               ram_size);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: invalid RAM size 0x%" HWADDR_PRIx "\n", __func__,
+                      ram_size);
         return 0x00000000;
     }
     bcr |= ram_base & 0xFF800000;
@@ -171,10 +165,8 @@ static void sdram_set_bcr(ppc4xx_sdram_t *sdram, int i,
 {
     if (sdram->bcr[i] & 0x00000001) {
         /* Unmap RAM */
-#ifdef DEBUG_SDRAM
-        printf("%s: unmap RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
-               __func__, sdram_base(sdram->bcr[i]), sdram_size(sdram->bcr[i]));
-#endif
+        trace_ppc4xx_sdram_unmap(sdram_base(sdram->bcr[i]),
+                                 sdram_size(sdram->bcr[i]));
         memory_region_del_subregion(get_system_memory(),
                                     &sdram->containers[i]);
         memory_region_del_subregion(&sdram->containers[i],
@@ -183,10 +175,7 @@ static void sdram_set_bcr(ppc4xx_sdram_t *sdram, int i,
     }
     sdram->bcr[i] = bcr & 0xFFDEE001;
     if (enabled && (bcr & 0x00000001)) {
-#ifdef DEBUG_SDRAM
-        printf("%s: Map RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
-               __func__, sdram_base(bcr), sdram_size(bcr));
-#endif
+        trace_ppc4xx_sdram_unmap(sdram_base(bcr), sdram_size(bcr));
         memory_region_init(&sdram->containers[i], NULL, "sdram-containers",
                            sdram_size(bcr));
         memory_region_add_subregion(&sdram->containers[i], 0,
@@ -216,10 +205,8 @@ static void sdram_unmap_bcr (ppc4xx_sdram_t *sdram)
     int i;
 
     for (i = 0; i < sdram->nbanks; i++) {
-#ifdef DEBUG_SDRAM
-        printf("%s: Unmap RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
-               __func__, sdram_base(sdram->bcr[i]), sdram_size(sdram->bcr[i]));
-#endif
+        trace_ppc4xx_sdram_unmap(sdram_base(sdram->bcr[i]),
+                                 sdram_size(sdram->bcr[i]));
         memory_region_del_subregion(get_system_memory(),
                                     &sdram->ram_memories[i]);
     }
@@ -316,16 +303,12 @@ static void dcr_write_sdram (void *opaque, int dcrn, uint32_t val)
         case 0x20: /* SDRAM_CFG */
             val &= 0xFFE00000;
             if (!(sdram->cfg & 0x80000000) && (val & 0x80000000)) {
-#ifdef DEBUG_SDRAM
-                printf("%s: enable SDRAM controller\n", __func__);
-#endif
+                trace_ppc4xx_sdram_enable("enable");
                 /* validate all RAM mappings */
                 sdram_map_bcr(sdram);
                 sdram->status &= ~0x80000000;
             } else if ((sdram->cfg & 0x80000000) && !(val & 0x80000000)) {
-#ifdef DEBUG_SDRAM
-                printf("%s: disable SDRAM controller\n", __func__);
-#endif
+                trace_ppc4xx_sdram_enable("disable");
                 /* invalidate all RAM mappings */
                 sdram_unmap_bcr(sdram);
                 sdram->status |= 0x80000000;
diff --git a/hw/ppc/ppc4xx_pci.c b/hw/ppc/ppc4xx_pci.c
index 304a29349c2e..5df97e6d156f 100644
--- a/hw/ppc/ppc4xx_pci.c
+++ b/hw/ppc/ppc4xx_pci.c
@@ -20,6 +20,7 @@
  * 4xx SoCs, such as the 440EP. */
 
 #include "qemu/osdep.h"
+#include "qemu/log.h"
 #include "hw/irq.h"
 #include "hw/ppc/ppc.h"
 #include "hw/ppc/ppc4xx.h"
@@ -152,8 +153,9 @@ static void ppc4xx_pci_reg_write4(void *opaque, hwaddr offset,
         break;
 
     default:
-        printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
-               (unsigned long)offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                     "%s: unhandled PCI internal register 0x%" HWADDR_PRIx "\n",
+                     __func__, offset);
         break;
     }
 }
@@ -218,8 +220,9 @@ static uint64_t ppc4xx_pci_reg_read4(void *opaque, hwaddr offset,
         break;
 
     default:
-        printf("%s: invalid PCI internal register 0x%lx\n", __func__,
-               (unsigned long)offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: invalid PCI internal register 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
         value = 0;
     }
 
diff --git a/hw/ppc/trace-events b/hw/ppc/trace-events
index ada644652d94..0c55aa501471 100644
--- a/hw/ppc/trace-events
+++ b/hw/ppc/trace-events
@@ -164,3 +164,8 @@ ppc4xx_gpt_init(uint64_t addr) "offet 0x%" PRIx64
 
 ppc405ep_clocks_compute(const char *param, uint32_t param2, uint32_t val) "%s 0x%1" PRIx32 " %d"
 ppc405ep_clocks_setup(const char *trace) "%s"
+
+# ppc4xx_devs.c
+ppc4xx_sdram_enable(const char *trace) "%s SDRAM controller"
+ppc4xx_sdram_unmap(uint64_t addr, uint64_t size) "Unmap RAM area 0x%" PRIx64 " size 0x%" PRIx64
+ppc4xx_sdram_map(uint64_t addr, uint64_t size) "Map RAM area 0x%" PRIx64 " size 0x%" PRIx64
