From: Vladimir Murzin <vladimir.murzin@arm.com>
To: afzal mohammed <afzal.mohd.ma@gmail.com>,
Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/4] ARM: v7-A !MMU support, prepare CONFIG_VECTORS_BASE removal
Date: Wed, 25 Jan 2017 11:24:05 +0000 [thread overview]
Message-ID: <e2f26415-61ef-7b2c-6ca5-cf06182e9cfd@arm.com> (raw)
In-Reply-To: <20170122031652.13074-1-afzal.mohd.ma@gmail.com>
On 22/01/17 03:16, afzal mohammed wrote:
> Hi,
>
> ARM core changes to support !MMU Kernel on v7-A MMU processors. This
> series also does the preparation for CONFIG_VECTORS_BASE removal.
>
> Based on the feedback from Russell, it was decided to handle vector
> base dynamically in C for no-MMU & work towards the the goal of
> removing VECTORS_BASE from Kconfig. MMU platform's always have
> exception base address at 0xffff0000, hence a macro was defined and
> it was decoupled from Kconfig. No-MMU CP15 scenario is handled
> dynamically in C. Once vector region setup, used by Cortex-R, is
> made devoid of VECTORS_BASE, it can be removed from Kconfig.
>
> This series has been verified over current mainline plus [2] on
> Vybrid Cosmic+, Cortex-M4 - !MMU Kernel and Cortex-A5 - MMU Kernel.
>
> This series also has been verified over Vladimir's series plus [2] on
> 1. Vybrid Cosmic+
> a. Cortex-M4 !MMU Kernel
> b. Cortex-A5 MMU Kernel
> c. Cortex-A5 !MMU Kernel
> 2. AM437x IDK
> a. Cortex-A9 MMU Kernel
> b. Cortex-A9 !MMU Kernel
>
> Regards
> afzal
>
It did not break my R-class setup and M-class MPS2 works too, so FWIW:
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Cheers
Vladimir
>
> v2:
> => Fix bisectability issue on !MMU builds
> => UL suffix on VECTORS_BASE definition
> => Use existing helpers to detect security extensions
> => Rewrite a CPP step to C for readability
>
> [1] "[RFC v2 PATCH 00/23] Allow NOMMU for MULTIPLATFORM",
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-November/470966.html
> (git://linux-arm.org/linux-vm.git nommu-rfc-v2)
>
> [2] "[PATCH 1/2] ARM: nommu: allow enabling REMAP_VECTORS_TO_RAM"
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473593.html
> (in -next)
>
> afzal mohammed (4):
> ARM: mmu: decouple VECTORS_BASE from Kconfig
> ARM: nommu: dynamic exception base address setting
> ARM: nommu: display vectors base
> ARM: nommu: remove Hivecs configuration is asm
>
> arch/arm/include/asm/memory.h | 2 ++
> arch/arm/kernel/head-nommu.S | 5 ----
> arch/arm/mach-berlin/platsmp.c | 3 ++-
> arch/arm/mm/dump.c | 5 ++--
> arch/arm/mm/init.c | 9 ++++++--
> arch/arm/mm/mm.h | 5 ++--
> arch/arm/mm/nommu.c | 52 ++++++++++++++++++++++++++++++++++++++++--
> 7 files changed, 67 insertions(+), 14 deletions(-)
>
prev parent reply other threads:[~2017-01-25 11:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-22 3:16 [PATCH v2 0/4] ARM: v7-A !MMU support, prepare CONFIG_VECTORS_BASE removal afzal mohammed
2017-01-22 3:19 ` [PATCH v2 1/4] ARM: mmu: decouple VECTORS_BASE from Kconfig afzal mohammed
2017-01-22 3:20 ` [PATCH v2 2/4] ARM: nommu: dynamic exception base address setting afzal mohammed
2017-01-22 3:22 ` [PATCH v2 3/4] ARM: nommu: display vectors base afzal mohammed
2017-01-30 14:03 ` Russell King - ARM Linux
2017-01-30 21:39 ` Afzal Mohammed
2017-01-22 3:22 ` [PATCH v2 4/4] ARM: nommu: remove Hivecs configuration is asm afzal mohammed
2017-01-25 11:24 ` Vladimir Murzin [this message]
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