[PATCH v4] ARM: early fixmap support for earlycon

[sboyd@codeaurora.org (Stephen Boyd)]

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@redhat.com>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Laura Abbott <lauraa@codeaurora.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Stefan Agner <stefan@agner.ch>
>

Works on msm_serial.

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

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