linux-kernel - Re: powerpc64: Enable CONFIG_E500 and CONFIG_PPC

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Message-ID: <992d2bea-019a-3969-e154-10b9b43ab6fc@sysgo.com>
Date:   Fri, 7 Oct 2016 11:00:09 +0200
From:   David Engraf <david.engraf@...go.com>
To:     Scott Wood <oss@...error.net>
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: powerpc64: Enable CONFIG_E500 and CONFIG_PPC_E500MC for
 e5500/e6500

Am 27.09.2016 um 01:08 schrieb Scott Wood:
> On Mon, 2016-09-26 at 10:48 +0200, David Engraf wrote:
>> Am 25.09.2016 um 08:20 schrieb Scott Wood:
>>>
>>> On Mon, Aug 22, 2016 at 04:46:43PM +0200, David Engraf wrote:
>>>>
>>>> The PowerPC e5500/e6500 architecture is based on the e500mc core. Enable
>>>> CONFIG_E500 and CONFIG_PPC_E500MC when e5500/e6500 is used.
>>>>
>>>> This will also fix using CONFIG_PPC_QEMU_E500 on PPC64.
>>>>
>>>> Signed-off-by: David Engraf <david.engraf@...go.com>
>>>> ---
>>>>  arch/powerpc/platforms/Kconfig.cputype | 6 ++++--
>>>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/platforms/Kconfig.cputype
>>>> b/arch/powerpc/platforms/Kconfig.cputype
>>>> index f32edec..0382da7 100644
>>>> --- a/arch/powerpc/platforms/Kconfig.cputype
>>>> +++ b/arch/powerpc/platforms/Kconfig.cputype
>>>> @@ -125,11 +125,13 @@ config POWER8_CPU
>>>>
>>>>  config E5500_CPU
>>>>  	bool "Freescale e5500"
>>>> -	depends on E500
>>>> +	select E500
>>>> +	select PPC_E500MC
>>>>
>>>>  config E6500_CPU
>>>>  	bool "Freescale e6500"
>>>> -	depends on E500
>>>> +	select E500
>>>> +	select PPC_E500MC
>>> These config symbols are for setting -mcpu.  Kernels built with
>>> CONFIG_GENERIC_CPU should also work on e5500/e6500.
>> I don't think so.
>
> I do think so.  It's what you get when you run "make corenet64_smp_defconfig"
> and that kernel works on e5500/e6500.
>
>>  At least on QEMU it is not working because e5500/e6500
>> is based on the e500mc core and the option CONFIG_PPC_E500MC also
>> controls the cpu features (check cputable.h).
>
> Again, this is only a problem when you have CONFIG_PPC_QEMU_E500 without
> CONFIG_CORENET_GENERIC, and the fix for that is to have CONFIG_PPC_QEMU_E500
> select CONFIG_E500 (and you need to manually turn on CONFIG_PPC_E500MC if
> applicable, since CONFIG_PPC_QEMU_E500 can also be used with e500v2).
>
> I wouldn't be opposed to also adding "select PPC_E500MC if PPC64" to
> CONFIG_PPC_QEMU_E500.

Please find attached the new version, setting E500 and PPC_E500MC on 64 
bit for review.

- David

>>>
>>> The problem is that CONFIG_PPC_QEMU_E500 doesn't select E500 (I didn't
>>> notice it before because usually CORENET_GENERIC is enabled as well).
>> I noticed that as well, but I think it makes more sense to select
>> E500/PPC_E500MC within the cputype menu instead of having a dependency
>> which might be not clear for the user.
>
> Again, that breaks CONFIG_GENERIC_CPU.  Unlike 32-bit, all 64-bit book3e
> targets are supposed to be supportable with a single kernel image.
>
> -Scott
>


View attachment "ppc.patch" of type "text/x-diff" (499 bytes)