tmp = REG_SET_FIELD(0, SH_MEM_CONFIG, ALIGNMENT_MODE,
                                            SH_MEM_ALIGNMENT_MODE_UNALIGNED);
                        WREG32_SOC15(GC, 0, mmSH_MEM_CONFIG, tmp);
-                       tmp = adev->gmc.shared_aperture_start >> 48;
+                       tmp = REG_SET_FIELD(0, SH_MEM_BASES, PRIVATE_BASE,
+                               (adev->gmc.private_aperture_start >> 48));
+                       tmp = REG_SET_FIELD(tmp, SH_MEM_BASES, SHARED_BASE,
+                               (adev->gmc.shared_aperture_start >> 48));
                        WREG32_SOC15(GC, 0, mmSH_MEM_BASES, tmp);
                }
        }
 
        adev->gmc.shared_aperture_start = 0x2000000000000000ULL;
        adev->gmc.shared_aperture_end =
                adev->gmc.shared_aperture_start + (4ULL << 30) - 1;
-       adev->gmc.private_aperture_start =
-               adev->gmc.shared_aperture_end + 1;
+       adev->gmc.private_aperture_start = 0x1000000000000000ULL;
        adev->gmc.private_aperture_end =
                adev->gmc.private_aperture_start + (4ULL << 30) - 1;