U-Boot support for M68K removal

[Tom Rini]

On Tue, Jan 31, 2023 at 07:50:45AM +1000, Greg Ungerer wrote:
> Hi Tom,
> 
> On 31/1/23 05:31, Tom Rini wrote:
> > 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.
> 
> FWIW the QEMU emulation of the m5208evb is good enough to run Linux.
> I do a lot of kernel testing (and development!) using that.

That's good to know! I was a little surprised at the message and it's
possible that the platform was just broken in U-Boot and the person
assumed that it was a QEMU issue instead.

-- 
Tom
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