On Wed, 7 Jan 2026 at 13:19, Kuan-Wei Chiu <[email protected]> wrote: > > Add support for the Motorola 68040 architecture. Currently, m68k > support in U-Boot is primarily focused on ColdFire variants. Introduce > the necessary infrastructure to support the classic M680x0 series, > specifically targeting the M68040 as emulated by QEMU. > > The implementation includes exception vectors, early startup code, and > minimal CPU initialization and relocation stubs. It also defines the > standard m68k boot information structure used for passing hardware > information to the operating system. To ensure compatibility, ColdFire- > specific library objects such as cache and interrupt handling are > excluded from the build when M68040 is selected. > > Additionally, apply a specific workaround during the early memory > reservation stage. Use a manual loop to clear global data instead of > the standard memset() function, as utilizing memset() at this point was > observed to cause a hang on the QEMU platform. > > Signed-off-by: Kuan-Wei Chiu <[email protected]> > --- > Changes in v6: > - Introduce hidden Kconfig symbol CONFIG_ARCH_COLDFIRE to group > ColdFire-specific files in Makefile, removing the need for > 'ifndef CONFIG_M680x0'. > - Add help text for CONFIG_M680x0. > > MAINTAINERS | 6 +++ > arch/m68k/Kconfig | 30 +++++++++++++ > arch/m68k/Makefile | 1 + > arch/m68k/config.mk | 10 ++++- > arch/m68k/cpu/m680x0/Makefile | 6 +++ > arch/m68k/cpu/m680x0/cpu.c | 73 ++++++++++++++++++++++++++++++++ > arch/m68k/cpu/m680x0/start.S | 73 ++++++++++++++++++++++++++++++++ > arch/m68k/cpu/m680x0/u-boot.lds | 47 ++++++++++++++++++++ > arch/m68k/include/asm/bootinfo.h | 39 +++++++++++++++++ > arch/m68k/lib/Makefile | 7 +-- > 10 files changed, 284 insertions(+), 8 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 >
Reviewed-by: Simon Glass <[email protected]>
