[v3,14/33] next-cube: add empty slots for unknown accesses to next.scr memory region

Commit Message

Mark Cave-Ayland Dec. 22, 2024, 12:59 p.m. UTC

The next.scr memory is now effectively unused, however there are 3 separate region
accesses still logged that occur when booting a NeXTStep disk image. Use the
empty_slot device to capture and ignore memory accesses to these 3 memory regions.

Signed-off-by: Mark Cave-Ayland <[e-mail]>
Reviewed-by: Thomas Huth <[e-mail]>
---
 hw/m68k/Kconfig     | 1 +
 hw/m68k/next-cube.c | 8 ++++++++
 2 files changed, 9 insertions(+)

Patch

diff --git a/hw/m68k/Kconfig b/hw/m68k/Kconfig
index 0092cda4e9..aff769b30f 100644
--- a/hw/m68k/Kconfig
+++ b/hw/m68k/Kconfig
@@ -18,6 +18,7 @@  config NEXTCUBE
     depends on M68K
     select FRAMEBUFFER
     select ESCC
+    select EMPTY_SLOT
 
 config Q800
     bool
diff --git a/hw/m68k/next-cube.c b/hw/m68k/next-cube.c
index 32d1108b2a..67432801a3 100644
--- a/hw/m68k/next-cube.c
+++ b/hw/m68k/next-cube.c
@@ -22,6 +22,7 @@ 
 #include "qom/object.h"
 #include "hw/char/escc.h" /* ZILOG 8530 Serial Emulation */
 #include "hw/block/fdc.h"
+#include "hw/misc/empty_slot.h"
 #include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
@@ -1238,6 +1239,13 @@  static void next_cube_init(MachineState *machine)
     /* BMAP IO - acts as a catch-all for now */
     sysbus_mmio_map(SYS_BUS_DEVICE(pcdev), 1, 0x02100000);
 
+    /* unknown: Brightness control register? */
+    empty_slot_init("next.unknown.0", 0x02110000, 0x10);
+    /* unknown: Magneto-Optical drive controller? */
+    empty_slot_init("next.unknown.1", 0x02112000, 0x10);
+    /* unknown: Serial clock configuration register? */
+    empty_slot_init("next.unknown.2", 0x02118004, 0x10);
+
     /* BMAP memory */
     memory_region_init_ram_flags_nomigrate(&m->bmapm1, NULL, "next.bmapmem",
                                            64, RAM_SHARED, &error_fatal);