Re: U-Boot support for M68K removal

Angelo Dureghello
2023-01-31T07:26:09Z

Hi Greg,

On Mon, Jan 30, 2023 at 10:50 PM Greg Ungerer <gerg@kernel.org> 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@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.
>
Thanks for the info !

> Regards
> Greg
>

Regards,
angelo
>

--
Angelo Dureghello
Timesys
e. angelo.dureghello@timesys.com