From: Vladimir Murzin <vladimir.murzin@arm.com>
To: Stefano Stabellini <sstabellini@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org, arnd@arndb.de,
ayan.kumar.halder@xilinx.com
Subject: Re: [RFC PATCH 3/3] ARM: Introduce MPS3 AN536
Date: Fri, 1 Jul 2022 10:06:42 +0100 [thread overview]
Message-ID: <b36b7559-936a-04b8-240d-e3a6bf828b85@arm.com> (raw)
In-Reply-To: <alpine.DEB.2.22.394.2206301336080.4389@ubuntu-linux-20-04-desktop>
Hi Stefano,
On 6/30/22 21:36, Stefano Stabellini wrote:
> On Thu, 30 Jun 2022, Vladimir Murzin wrote:
>> Application Note 536 FPGA image implements the dual Cortex-R52 system
>> which is extended with interconnect and peripherals to provide an
>> example design.
>>
>> Unfortunately, design does't support exclusive access to shareable
>> memory which is show stopper for SMP support - we enforce shareable
>> attribute via MPU.
>
> Hi Vladimir,
>
> What do you mean by "design does't support exclusive access to shareable
> memory"?
>
I meant platform integration issue and it has nothing to do with core itself,
in other words it is the issue for this particular platform.
> I thought it was possible to use LDREX/STREX on memory shared between
> two R52 cores as long as the memory is uncacheable.
That's correct understanding assuming integration done correctly :)
Cheers
Vladimir
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next prev parent reply other threads:[~2022-07-01 9:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-30 8:36 [RFC PATCH 0/3] ARM: Support Cortex-R platform(s) Vladimir Murzin
2022-06-30 8:36 ` [RFC PATCH 1/3] ARM: Introduce ARM_SINGLE_ARMV7R for ARMv7-R platforms Vladimir Murzin
2022-06-30 9:22 ` Arnd Bergmann
2022-07-01 9:22 ` Vladimir Murzin
2022-07-01 11:24 ` Arnd Bergmann
2022-06-30 8:36 ` [RFC PATCH 2/3] ARM: mps2: Split into ARCH/MACH options Vladimir Murzin
2022-06-30 8:36 ` [RFC PATCH 3/3] ARM: Introduce MPS3 AN536 Vladimir Murzin
2022-06-30 20:36 ` Stefano Stabellini
2022-07-01 9:06 ` Vladimir Murzin [this message]
2022-06-30 21:17 ` [RFC PATCH 0/3] ARM: Support Cortex-R platform(s) Arnd Bergmann
2022-07-01 9:39 ` Vladimir Murzin
2022-07-01 14:18 ` Arnd Bergmann
2022-07-01 14:38 ` Vladimir Murzin
2022-07-12 8:33 ` Vladimir Murzin
2022-07-12 9:23 ` Arnd Bergmann
2022-07-12 20:44 ` Stefano Stabellini
2022-08-01 15:11 ` Vladimir Murzin
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