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

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Date:   Sat, 9 Apr 2022 14:14:08 +1000
From:   Greg Ungerer <gerg@...ux-m68k.org>
To:     Rob Landley <rob@...dley.net>, Daniel Palmer <daniel@...f.com>
Cc:     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 10:24, 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...
> 
> $ 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 run and test all development rc and release kernels on the qemu m5208 target
(that is a ColdFire v2 nommu core, the "-machine mcf5208evb" qemu target).
Of course I test real hardware as well :-)

The kernel's m5208evb_defconfig works for qemu. Though you will need to sort
out a user space to get to a login/shell. I mostly use the last uClibc for
that.



>>> It looked like 68328serial.c was removed because someone tried to
>>> clean it up and it was decided that no one was using it and it was
>>> best to delete it.
>>> My plan was to at some point send a series to fix up the issues with
>>> the Dragonball support, revert removing the serial driver and adding
>>> the patch that cleaned it up.
>>
>> Nice. I will leave all the 68000/68328 code alone for now then.
> 
> The q800 config uses CONFIG_SERIAL_PMACZILOG. Seems to work fine?

Sure, but the Dragonball are a 68328 SoC family. Its serial hardware block
is different, needs a different driver. At least all the ColdFire parts
use the same internal hardware serial block.

Regards
Greg