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

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Message-ID: <CAKv+Gu_7UrOkDBUhZdnKY4bMuw9+jLY0vjeG_PZ3y7cB+rooBQ@mail.gmail.com>
Date:	Wed, 17 Jun 2015 11:33:50 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Stefan Agner <stefan@...er.ch>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rob Herring <robh@...nel.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Kees Cook <keescook@...omium.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Salter <msalter@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4] ARM: early fixmap support for earlycon

On 17 June 2015 at 01:22, Stephen Boyd <sboyd@...eaurora.org> wrote:
> 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>
>

I gave this a spin as well, on Arndale, with /chosen/stdout-path set
to &serial_2  and just 'earlycon' (without value) passed on the
command line, and it works fine.

Tested-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
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