[PATCH v4 5/6] board: Add QEMU m68k virt board support

[Kuan-Wei Chiu]

Hi Heinrich,

On Fri, Jan 02, 2026 at 10:26:45AM +0100, Heinrich Schuchardt wrote:
> On 1/1/26 18:54, Kuan-Wei Chiu wrote:
> > Add support for the QEMU 'virt' machine on the m68k architecture. This
> > board emulates a generic machine based on the Motorola 68040 CPU
> > equipped with Goldfish virtual peripherals.
> > 
> > Introduce the necessary board configuration and initialization
> > infrastructure. The implementation includes logic to parse the QEMU
> > bootinfo interface, enabling dynamic detection of system RAM size to
> > adapt to the virtual machine's configuration.
> > 
> > Enable the Goldfish TTY driver for serial console output. Additionally,
> > enable Goldfish RTC and timer drivers to support real-time clock
> > functionality and nanosecond-resolution delays. Include comprehensive
> > documentation covering build instructions and usage examples.
> > 
> > Signed-off-by: Kuan-Wei Chiu <visitorckw at gmail.com>
> > Tested-by: Daniel Palmer <daniel at 0x0f.com>
> > ---
> > No changes in v4.
> > 
> >   arch/m68k/Kconfig                     |   8 ++
> >   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 +++++++++
> >   include/configs/qemu-m68k.h           |  18 ++++
> >   9 files changed, 222 insertions(+)
> >   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 include/configs/qemu-m68k.h
> > 
> > diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
> > index de7c673c376..605ae5ec20c 100644
> > --- a/arch/m68k/Kconfig
> > +++ b/arch/m68k/Kconfig
> > @@ -183,6 +183,13 @@ config TARGET_STMARK2
> >           select CF_DSPI
> >           select M54418
> > +config TARGET_QEMU_M68K
> > +    bool "Support QEMU m68k virt"
> > +    select M68040
> 
> Not even the dm command is available on the board by default. How about
> letting TARGET_QEMU_M68K imply CMD_DM like other targets do?

Agreed.
Will add imply CMD_DM in the next version.

Regards,
Kuan-Wei