Add support for the QEMU 'virt' machine on the m68k architecture. The QEMU virt machine models a generic system utilizing Goldfish virtual peripherals and is capable of emulating various classic 68k CPUs.
Currently, U-Boot's m68k architecture support focuses on ColdFire variants. Expand this to include the classic M680x0 architecture, implementing the necessary exception vectors, startup code, and a bootinfo parser compatible with the QEMU interface. A driver for the Goldfish TTY is also added to enable serial console output. The implementation has been verified on QEMU targeting the M68040 CPU, confirming successful hardware initialization and boot to the U-Boot command shell. Additionally, the CI configuration was verified locally using gitlab-ci-local "qemu_m68k_virt test.py", resulting in PASS qemu_m68k_virt test.py. --- Changes in v4: - Support DT probing with platform data as a fallback. (serial & timer) - Fix sandbox build warnings by removing incorrect type casting. - Add comment explaining read latching behavior in the timer driver. - Sort headers alphabetically in the timer driver. Changes in v3: - Add Goldfish timer driver. - Update Goldfish RTC driver to support non-DT probing. - Enable Goldfish RTC and Timer support in board configuration. - Add safety loop limit to bootinfo parsing in dram_init. - Remove dummy timer functions from architecture code. - Remove unnecessary type casts in Goldfish TTY driver. - Remove TEST_PY_ID from CI job definitions. - Update documentation to include new RTC support. Changes in v2: - Refactor Goldfish TTY driver to use priv data for the RX buffer and ensure single-byte reads. - Rename arch/m68k/cpu/m68040 to arch/m68k/cpu/m680x0 to separate the architecture family from the specific CPU model. - Introduce M680x0 Kconfig symbol and separate MAINTAINERS entries for the architecture and the board. - Regenerate qemu-m68k_defconfig using make savedefconfig and add the board to the documentation index. - Add a new patch to enable CI testing on GitLab and Azure Pipelines. - Update SPDX identifiers to GPL-2.0-or-later. - Sort headers alphabetically. - Fix tabs vs spaces. v3: https://lore.kernel.org/u-boot/[email protected]/ v2: https://lore.kernel.org/u-boot/[email protected]/ v1: https://lore.kernel.org/u-boot/[email protected]/ Kuan-Wei Chiu (6): serial: Add Goldfish TTY driver timer: Add Goldfish timer driver rtc: goldfish: Support platform data for non-DT probing m68k: Add support for M68040 CPU board: Add QEMU m68k virt board support CI: Add test jobs for QEMU m68k virt machine .azure-pipelines.yml | 3 + .gitlab-ci.yml | 6 ++ MAINTAINERS | 18 ++++ arch/m68k/Kconfig | 24 ++++++ arch/m68k/Makefile | 1 + arch/m68k/config.mk | 10 ++- arch/m68k/cpu/m680x0/Makefile | 6 ++ arch/m68k/cpu/m680x0/cpu.c | 72 ++++++++++++++++ arch/m68k/cpu/m680x0/start.S | 73 ++++++++++++++++ arch/m68k/cpu/m680x0/u-boot.lds | 47 +++++++++++ arch/m68k/include/asm/bootinfo.h | 31 +++++++ arch/m68k/lib/Makefile | 9 +- board/emulation/qemu-m68k/Kconfig | 12 +++ board/emulation/qemu-m68k/MAINTAINERS | 8 ++ board/emulation/qemu-m68k/Makefile | 5 ++ board/emulation/qemu-m68k/qemu-m68k.c | 115 ++++++++++++++++++++++++++ configs/qemu-m68k_defconfig | 16 ++++ doc/board/emulation/index.rst | 1 + doc/board/emulation/qemu-m68k.rst | 39 +++++++++ drivers/rtc/goldfish_rtc.c | 13 ++- drivers/serial/Kconfig | 8 ++ drivers/serial/Makefile | 1 + drivers/serial/serial_goldfish.c | 109 ++++++++++++++++++++++++ drivers/timer/Kconfig | 8 ++ drivers/timer/Makefile | 1 + drivers/timer/goldfish_timer.c | 81 ++++++++++++++++++ include/configs/qemu-m68k.h | 18 ++++ include/goldfish_rtc.h | 15 ++++ include/goldfish_timer.h | 13 +++ include/goldfish_tty.h | 18 ++++ 30 files changed, 770 insertions(+), 11 deletions(-) create mode 100644 arch/m68k/cpu/m680x0/Makefile create mode 100644 arch/m68k/cpu/m680x0/cpu.c create mode 100644 arch/m68k/cpu/m680x0/start.S create mode 100644 arch/m68k/cpu/m680x0/u-boot.lds create mode 100644 arch/m68k/include/asm/bootinfo.h create mode 100644 board/emulation/qemu-m68k/Kconfig create mode 100644 board/emulation/qemu-m68k/MAINTAINERS create mode 100644 board/emulation/qemu-m68k/Makefile create mode 100644 board/emulation/qemu-m68k/qemu-m68k.c create mode 100644 configs/qemu-m68k_defconfig create mode 100644 doc/board/emulation/qemu-m68k.rst create mode 100644 drivers/serial/serial_goldfish.c create mode 100644 drivers/timer/goldfish_timer.c create mode 100644 include/configs/qemu-m68k.h create mode 100644 include/goldfish_rtc.h create mode 100644 include/goldfish_timer.h create mode 100644 include/goldfish_tty.h -- 2.52.0.358.g0dd7633a29-goog
