From: vladimir.murzin@arm•com (Vladimir Murzin)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 0/3] ARM: nommu: R-class fixes
Date: Tue, 26 Apr 2016 09:17:14 +0100 [thread overview]
Message-ID: <571F240A.9030404@arm.com> (raw)
In-Reply-To: <55296515.n2D97kIgVc@wuerfel>
On 25/04/16 13:59, Arnd Bergmann wrote:
> On Monday 25 April 2016 08:55:57 Vladimir Murzin wrote:
>> On 23/04/16 07:54, Afzal Mohammed wrote:
>>> Hi,
>>>
>>> On Fri, Apr 22, 2016 at 12:43:33PM +0100, Vladimir Murzin wrote:
>>>
>>>> Small set of fixes discovered with R-class cores.
>>>
>>> just curious, is Cortex-R supported on mainline ?, thought it was not
>>> supported, but subject & changelogs gave such a feeling.
>>
>> Hi,
>>
>> I believe it is supported since c90ad5c "ARM: add Cortex-R7 Processor
>> Info" although overtime it got blocked (at least for Vexpress) with
>> Kconfig changes. There was attempt [1] to sort it out, but looks like
>> these patches went nowhere, so I'm trying to re-start with the fixes
>> coming first.
>>
>> [1]
>> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/174256.html
>
> Good to know, thanks for working on this!
Since you are in a thread, just want to confirm if the following is
still the right (only?) way how we want to support R-class?
-----8<-------
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f066e..ead2b25 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -289,8 +289,7 @@ choice
config ARCH_MULTIPLATFORM
bool "Allow multiple platforms to be selected"
- depends on MMU
- select ARM_PATCH_PHYS_VIRT
+ select ARM_PATCH_PHYS_VIRT if MMU
select AUTO_ZRELADDR
select COMMON_CLK
select MULTI_IRQ_HANDLER
----->8--------
I have separate Kconfig entry to represent R-class Vexpress platform
locally, but I guess it is noway, right? ;)
>
> What hardware platform do you use? It would be nice to make it a little
> more explicit which platforms can use the ARMv7-R, or an ARMv7-A with
> the MMU disabled.
Currently I'm dealing mostly with ARMv7-R FVP models which represents
Vexpress with R-class tile (it is why this mini series have MPU
patches). I've never tried ARMv7-A with the MMU disabled and I'm quite
in doubt if it is feasible.
Cheers
Vladimir
>
> Arnd
>
>
next prev parent reply other threads:[~2016-04-26 8:17 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-22 11:43 [PATCH 0/3] ARM: nommu: R-class fixes Vladimir Murzin
2016-04-22 11:43 ` [PATCH 1/3] ARM: nommu: fix PMSAv7 setup Vladimir Murzin
2016-04-22 11:43 ` [PATCH 2/3] ARM: nommu: change memory reserve for the vectors Vladimir Murzin
2016-04-22 11:43 ` [PATCH 3/3] ARM: domain: move {set,get}_domain under config guard Vladimir Murzin
2016-04-27 10:49 ` [PATCH 3/3] ARM: domain: move {set, get}_domain " Russell King - ARM Linux
2016-04-27 12:16 ` Vladimir Murzin
2016-04-28 13:50 ` Russell King - ARM Linux
2016-04-28 14:44 ` Vladimir Murzin
2016-04-28 14:59 ` Russell King - ARM Linux
2016-04-28 15:06 ` Vladimir Murzin
2016-04-23 6:54 ` [PATCH 0/3] ARM: nommu: R-class fixes Afzal Mohammed
2016-04-25 7:55 ` Vladimir Murzin
2016-04-25 12:59 ` Arnd Bergmann
2016-04-25 13:30 ` Afzal Mohammed
2016-04-26 8:17 ` Vladimir Murzin
2016-04-26 8:17 ` Vladimir Murzin [this message]
2016-04-26 9:10 ` Arnd Bergmann
2016-04-26 10:57 ` Vladimir Murzin
2016-04-26 11:59 ` Arnd Bergmann
2016-04-26 12:24 ` Vladimir Murzin
2016-04-26 18:12 ` Arnd Bergmann
2016-04-27 9:10 ` Vladimir Murzin
2016-04-27 9:50 ` Arnd Bergmann
2016-04-27 10:55 ` Vladimir Murzin
2016-04-27 11:18 ` Arnd Bergmann
2016-04-26 15:23 ` Afzal Mohammed
2016-04-28 9:41 ` Maxime Coquelin
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