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q800: add ESCC alias at 0xc000

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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>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-ID: <20231004083806.757242-19-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2023-10-04 09:38:04 +01:00 committed by Laurent Vivier
parent c698b0c8ed
commit 7685fc2a18
2 changed files with 7 additions and 0 deletions
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6
hw/m68k/q800.c
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@ -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,

1
include/hw/m68k/q800.h
View File

@ -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")