@@ -451,6 +451,12 @@ static void q800_machine_init(MachineState *machine)
memory_region_add_subregion(&m->macio, SCC_BASE - IO_BASE,
sysbus_mmio_get_region(sysbus, 0));
+ /* Create alias for NetBSD */
+ memory_region_init_alias(&m->escc_alias, OBJECT(machine), "escc-alias",
+ sysbus_mmio_get_region(sysbus, 0), 0, 0x8);
+ memory_region_add_subregion(&m->macio, SCC_BASE - IO_BASE - 0x20,
+ &m->escc_alias);
+
/* SCSI */
object_initialize_child(OBJECT(machine), "esp", &m->esp,
@@ -67,6 +67,7 @@ struct Q800MachineState {
MemoryRegion macio;
MemoryRegion macio_alias;
MemoryRegion machine_id;
+ MemoryRegion escc_alias;
};
#define TYPE_Q800_MACHINE MACHINE_TYPE_NAME("q800")
Tests on real Q800 hardware show that the ESCC is addressable at multiple locations within the ESCC memory region - at least 0xc000, 0xc020 (as expected by the MacOS toolbox ROM) and 0xc040. All released NetBSD kernels before 10 use the 0xc000 address which causes a fatal error when running the MacOS booter. Add a single memory region alias at 0xc000 to enable NetBSD kernels to start booting under QEMU. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> --- hw/m68k/q800.c | 6 ++++++ include/hw/m68k/q800.h | 1 + 2 files changed, 7 insertions(+)