This implements a barebones Sun 3/60 that can boot a standard firmware, pass all the diagnostic tests and fully netboot both NetBSD 10 and SunOS 4.1.1
It has the minimum necessary devices: memory/MMU, diagnostic and error registers, interrupt, TOD clock, DMA, IDprom and configuration eeprom. I/O is the console serial and lance ethernet.
There are a few modifications needed to emulate a proper 68020, support another external MMU and sun3 specific ways of u sing the escc and ethernet devices.
Next steps are implementing SCSI, graphics, and patching through the keyboard and mouse.

This is part of the Sun 3/60 preservation project: https://github.com/54weasels/sun3_60

54weasels (7):
  target/m68k: Implement Physical Bus Error exception handling
  hw/net/lance: Add Sun-3 Native DMA byte-swapping support
  hw/char/escc: Expose diagnostic RS232 I/O routing
  hw/timer: Introduce Intersil 7170 RTC implementation
  hw/m68k: Overhaul Sun-3 MMU and Boot PROM mapping
  tests/qtest: Add Sun-3 hardware interaction tests
  tests/functional: Add Sun-3 firmware boot and diagnostic test

 hw/char/escc.c                      |  33 +-
 hw/m68k/Kconfig                     |   8 +
 hw/m68k/meson.build                 |   1 +
 hw/m68k/sun3.c                      | 499 ++++++++++++++++++++
 hw/m68k/sun3_eeprom_data.h          | 259 ++++++++++
 hw/m68k/sun3mmu.c                   | 705 ++++++++++++++++++++++++++++
 hw/net/lance.c                      | 111 ++++-
 hw/net/meson.build                  |   3 +-
 hw/timer/Kconfig                    |   3 +
 hw/timer/intersil7170.c             | 216 +++++++++
 hw/timer/meson.build                |   1 +
 include/hw/char/escc.h              |   3 +
 include/hw/m68k/sun3mmu.h           |  65 +++
 include/hw/net/lance.h              |   3 +
 include/hw/timer/intersil7170.h     |   9 +
 target/m68k/cpu.c                   |   5 +-
 target/m68k/cpu.h                   |  18 +-
 target/m68k/helper.c                | 130 ++++-
 target/m68k/op_helper.c             | 176 ++++---
 target/m68k/translate.c             |  31 +-
 tests/functional/m68k/meson.build   |   1 +
 tests/functional/m68k/test_sun3.py  |  34 ++
 tests/functional/qemu_test/asset.py |  11 +-
 tests/qtest/meson.build             |   1 +
 tests/qtest/sun3-test.c             |  67 +++
 25 files changed, 2294 insertions(+), 99 deletions(-)
 create mode 100644 hw/m68k/sun3.c
 create mode 100644 hw/m68k/sun3_eeprom_data.h
 create mode 100644 hw/m68k/sun3mmu.c
 create mode 100644 hw/timer/intersil7170.c
 create mode 100644 include/hw/m68k/sun3mmu.h
 create mode 100644 include/hw/timer/intersil7170.h
 create mode 100755 tests/functional/m68k/test_sun3.py
 create mode 100644 tests/qtest/sun3-test.c

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2.50.1 (Apple Git-155)