linux-kernel - Re: regression for m68k/coldfire

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Date:   Fri, 3 Feb 2017 16:22:27 +0100
From:   Laurent Vivier <laurent@...ier.eu>
To:     Waldemar Brodkorb <wbx@...nadk.org>
Cc:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Greg Ungerer <gerg@...inux.org>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        linux-kernel@...r.kernel.org, linux-m68k@...r.kernel.org,
        uclinux-dev@...inux.org, geert@...ux-m68k.org
Subject: Re: regression for m68k/coldfire

Le 03/02/2017 à 16:17, Waldemar Brodkorb a écrit :
> Hi,
> Laurent Vivier wrote,
> 
>> Le 03/02/2017 à 01:35, John Paul Adrian Glaubitz a écrit :
>>> On 02/03/2017 01:10 AM, Greg Ungerer wrote:
>>>> This is a limitation in the FEC support in QEMU.
>>>> This works on real ColdFire hardware (which do support the
>>>> FEC MIB stats registers from offset 0x200 - so not 5272).
>>>> I sent this patch to the qemu dev list a couple of weeks
>>>> back which fixes qemu:
>>>>
>>>>  http://lists.gnu.org/archive/html/qemu-devel/2017-01/msg01781.html
>>>>
>>>> I do not believe it has been picked up by QEMU mainline yet
>>>> (I will probably have to resend and push a little to get that done).
>>>
>>> QEMU upstream can sometimes take a while before they are merging patches,
>>> but usually it helps containing the maintainer of this part of the
>>> source tree directly.
>>>
>>> Unfortunately, mcf5208 is currently unmaintained [1]:
>>>
>>> mcf5208
>>> S: Orphan
>>> F: hw/m68k/mcf5208.c
>>> F: hw/m68k/mcf_intc.c
>>> F: hw/char/mcf_uart.c
>>> F: hw/net/mcf_fec.c
>>>
>>> But you can try getting into touch with Laurent Vivier who is the
>>> new maintainer of the m68k target. I have CC'ed him.
>>>
>>> Adrian
>>>
>>>> [1] http://git.qemu.org/?p=qemu.git;a=blob;f=MAINTAINERS
>>>
>>
>> Use scripts/get_maintainer.pl on your patch to find the people.
>>
>> This patch is on the network part, so you should cc:
>> Jason Wang <jasowang@...hat.com> (odd fixer:Network devices)
>>
>> If you cc me, you add more chances to have a review ;)
> 
> I tried the patch on top of 2.8.0 qemu release and it works for me
> with Linux Kernel 4.9.

If you can send a "Tested-by:" to the mailing list, it would be great.

> Thanks for the hint and patch!
> I hope Greg's patch get included in the next qemu release.
> 
> Btw: Laurent, are you m68k with mmu support are going to be included
> upstream? I always carry an old binary for any m68k with mmu testing.

I'm working to have the FPU included for now, that will allow to have
the linux-user qemu enabled for 680x0 upstream.

I have a 68040 MMU implementation that I will send after this step.
I didn't have a look to the ColdFire MMU (is there one?), but as 68040
is not the same as the 68030 one, I don't expect it works with coldfire.

Laurent