linux-kernel - Re: [PATCH v4] ARM: early fixmap support for earlycon

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Message-ID: <5580AFD0.1030606@codeaurora.org>
Date:	Tue, 16 Jun 2015 16:22:56 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Stefan Agner <stefan@...er.ch>, linux@....linux.org.uk
CC:	Rob Herring <robh@...nel.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Kees Cook <keescook@...omium.org>,
	Arnd Bergmann <arnd@...db.de>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-kernel@...r.kernel.org, Mark Salter <msalter@...hat.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] ARM: early fixmap support for earlycon

On 06/16/2015 02:51 PM, Stefan Agner wrote:
> Add early fixmap support, initially to support permanent, fixed
> mapping support for early console. A temporary, early pte is
> created which is migrated to a permanent mapping in paging_init.
> This is also needed since the attributes may change as the memory
> types are initialized. The 3MiB range of fixmap spans two pte
> tables, but currently only one pte is created for early fixmap
> support.
>
> Re-add FIX_KMAP_BEGIN to the index calculation in highmem.c since
> the index for kmap does not start at zero anymore. This reverts
> 4221e2e6b316 ("ARM: 8031/1: fixmap: remove FIX_KMAP_BEGIN and
> FIX_KMAP_END") to some extent.
>
> Cc: Mark Salter <msalter@...hat.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Laura Abbott <lauraa@...eaurora.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Signed-off-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Stefan Agner <stefan@...er.ch>
>

Works on msm_serial.

Tested-by: Stephen Boyd <sboyd@...eaurora.org>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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