linux-kernel - Re: [RFC PULL] remove arch/h8300

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Message-ID: <147dc6cc-1fbb-558f-8e6d-29d4327d54b4@linux-m68k.org>
Date:   Sat, 9 Apr 2022 14:18:48 +1000
From:   Greg Ungerer <gerg@...ux-m68k.org>
To:     Finn Thain <fthain@...ux-m68k.org>, Rob Landley <rob@...dley.net>
Cc:     Daniel Palmer <daniel@...f.com>, Arnd Bergmann <arnd@...db.de>,
        Christoph Hellwig <hch@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "moderated list:H8/300 ARCHITECTURE" 
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>, Max Filippov <jcmvbkbc@...il.com>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Damien Le Moal <damien.lemoal@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [RFC PULL] remove arch/h8300


On 9/4/22 11:59, Finn Thain wrote:
> On Fri, 8 Apr 2022, Rob Landley wrote:
> 
>> On 4/5/22 08:07, Greg Ungerer wrote:
>>> On 5/4/22 13:23, Daniel Palmer wrote:
>>>> On Mon, 4 Apr 2022 at 22:42, Greg Ungerer <gerg@...ux-m68k.org> wrote:
>>>>> But we could consider the Dragonball support for removal. I keep it
>>>>> compiling, but I don't use it and can't test that it actually works.
>>>>> Not sure that it has been used for a very long time now. And I
>>>>> didn't even realize but its serial driver (68328serial.c) was
>>>>> removed in 2015. No one seems too have noticed and complained.
>>>>
>>>> I noticed this and I am working on fixing it up for a new Dragonball
>>>> homebrew machine. I'm trying to add a 68000 machine to QEMU to make
>>>> the development easier because I'm currently waiting an hour or more
>>>> for a kernel to load over serial. It might be a few months.
>>
>> I've been booting Linux on qemu-system-m68k -M q800 for a couple years
>> now? (The CROSS=m68k target of mkroot in toybox?)
>>
>> # cat /proc/cpuinfo
>> CPU:		68040
>> MMU:		68040
>> FPU:		68040
>> Clocking:	1261.9MHz
>> BogoMips:	841.31
>> Calibration:	4206592 loops
>>
>> It certainly THINKS it's got m68000...
>>
> 
> Most 68040 processor variants have a built-in MMU and the m68k "nommu"
> Linux port doesn't support them. The nommu port covers processors like
> 68000, Dragonball etc. whereas the m68k "mmu" port covers 680x0 where x is
> one of 2,3,4,6 with MMU.
> 
>> $ qemu-system-m68k -cpu ?
>> cfv4e
>> m5206
>> m5208
>> m68000
>> m68010
>> m68020
>> m68030
>> m68040
>> m68060
>> any
>>
>> (I'd love to get an m68k nommu system working but never sat down and
>> worked out a kernel .config qemu agreed to run, plus compiler and libc.
>> Musl added m68k support but I dunno if that includes coldfire?)
>>
> 
> I could never figure out how to boot a coldfire machine in qemu either.
> There was no documentation about that back when I attempted it but maybe
> things have improved since.

FWIW this will do it:

     qemu-system-m68k -nographic -machine mcf5208evb -kernel vmlinux

That will boot an m5208evb_defconfig generated vmlinux.
But you will need a user space to get a full boot to login/shell.

Regards
Greg