U-Boot support for M68K removal

[Tom Rini]

On Mon, Jan 30, 2023 at 08:10:36PM +0100, Geert Uytterhoeven wrote:
> Hi Eero,
> 
> On Mon, Jan 30, 2023 at 8:02 PM Eero Tamminen <oak at helsinkinet.fi> wrote:
> > On 30.1.2023 18.34, Tom Rini wrote:
> > > That's great to hear. While I started my life on m68k machines, I never
> > > did get Linux up on one. Do the coldfire platforms you have run U-Boot
> > > today? If so, are they already supported upstream? One of my biggest
> > > concerns about the architecture, in U-Boot, is that I've just not heard
> > > of anyone using it in quite some time, and we don't have any emulated
> > > platforms either (can it be done in QEMU? We have other plaforms in CI
> > > via QEMU) so I worry it's not working.
> >
> > Qemu supports both m68k and ColdFire nowadays:
> > https://www.qemu.org/docs/master/system/target-m68k.html
> >
> >
> >         - Eero
> >
> > PS. For m68k there are also a lot of other emulators that emulate
> > specific platforms.
> >
> > Aranym, 68040 Atari "clone", used a lot by Debian m68k port before Qemu
> > got m68k support.
> >
> > WinAUE, 68000-68040 Amiga emulation.  Unlike Aranym or Qemu, this
> > emulates also CPU cache.
> >
> > Hatari, 68000-68040 Atari emulation (based on WinUAE CPU core).
> >
> > Previous, 68030 NeXT emulator (based on Hatari).
> 
> But none of the platforms listed above boot using U-Boot, which is
> what Tom is interested in...
> 
> "qemu-system-m68k -machine help" lists a.o.:
> 
>     an5206               Arnewsh 5206
>     mcf5208evb           MCF5208EVB (default)
> 
> U-Boot still contains include/configs/M5208EVBE.h, but there are no
> actual users...
> 
> Angelo: so support for amcore in qemu would be nice ;-)

I did a little searching after sending and I see there's been some
patches for mcf5208evb and U-Boot, in QEMU but the last message (2019)
was that the CPU emulation wasn't quite complete enough.  But yes, one
way or another, it would be really great to get a virtualized platform
in CI to prevent future breakage.

-- 
Tom
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