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-rw-r--r--hw/display/ati.c5
-rw-r--r--hw/display/ati_dbg.c1
-rw-r--r--hw/display/ati_regs.h1
3 files changed, 7 insertions, 0 deletions
diff --git a/hw/display/ati.c b/hw/display/ati.c
index 95fc443cac..4c3ad8f47b 100644
--- a/hw/display/ati.c
+++ b/hw/display/ati.c
@@ -361,6 +361,11 @@ static uint64_t ati_mm_read(void *opaque, hwaddr addr, unsigned int size)
     case MC_STATUS:
         val = 5;
         break;
+    case MEM_SDRAM_MODE_REG:
+        if (s->dev_id != PCI_DEVICE_ID_ATI_RAGE128_PF) {
+            val = BIT(28) | BIT(20);
+        }
+        break;
     case RBBM_STATUS:
     case GUI_STAT:
         val = 64; /* free CMDFIFO entries */
diff --git a/hw/display/ati_dbg.c b/hw/display/ati_dbg.c
index 0ebbd36f14..bd0ecd48c7 100644
--- a/hw/display/ati_dbg.c
+++ b/hw/display/ati_dbg.c
@@ -42,6 +42,7 @@ static struct ati_regdesc ati_reg_names[] = {
     {"MC_FB_LOCATION", 0x0148},
     {"MC_AGP_LOCATION", 0x014C},
     {"MC_STATUS", 0x0150},
+    {"MEM_SDRAM_MODE_REG", 0x0158},
     {"MEM_POWER_MISC", 0x015c},
     {"AGP_BASE", 0x0170},
     {"AGP_CNTL", 0x0174},
diff --git a/hw/display/ati_regs.h b/hw/display/ati_regs.h
index ebd37ee30d..d6282b2ef2 100644
--- a/hw/display/ati_regs.h
+++ b/hw/display/ati_regs.h
@@ -60,6 +60,7 @@
 #define MC_FB_LOCATION                          0x0148
 #define MC_AGP_LOCATION                         0x014C
 #define MC_STATUS                               0x0150
+#define MEM_SDRAM_MODE_REG                      0x0158
 #define MEM_POWER_MISC                          0x015c
 #define AGP_BASE                                0x0170
 #define AGP_CNTL                                0x0174