[PATCH 2/3] m68k: Add support for M68040 CPU

[Tom Rini]

On Sun, Dec 21, 2025 at 12:43:08AM +0800, Kuan-Wei Chiu wrote:
> Hi Tom,
> 
> On Thu, Dec 18, 2025 at 01:00:32PM -0600, Tom Rini wrote:
> > On Thu, Dec 18, 2025 at 06:52:51PM +0000, Kuan-Wei Chiu wrote:
> > > Add support for the Motorola 68040 architecture. Currently, m68k
> > > support in U-Boot is primarily focused on ColdFire (MCF5xxx) 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 <visitorckw at gmail.com>
> > [snip]
> > > diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
> > > index 8ade6f7b9d1..a41c375f6be 100644
> > > --- a/arch/m68k/Kconfig
> > > +++ b/arch/m68k/Kconfig
> > > @@ -56,6 +56,9 @@ config MCF5441x
> > >          select DM_SERIAL
> > >  	bool
> > >  
> > > +config M68040
> > > +    bool
> > > +
> > 
> > The file is unfortunately inconsistent about tabs vs spaces, but all the
> > new options should be tab-indent only, and no extra blank lines added.
> 
> I'll fix this in v2.
> 
> BTW, do you think it would be helpful to add a check in checkpatch.pl
> to warn about space indentation in Kconfig files?

I checked and the linux kernel has many space-not-tab in Kconfig files,
so it would be a change to add it to the U-Boot specific tests part of
checkpatch.pl, and a patch to do so would be welcome, thanks!

-- 
Tom
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