[PATCH, AArch64] Add Cortex-A53 erratum 843419 configure-time option

[Yvan Roux <yvan dot roux at linaro dot org>]

Hi all,

As described in the thread bellow, there is a link-time workaround for
an erratum (843419) of some early revision of Cortex-A53.  Similarly
to what was done for a previous erratum, this patch adds a new
configure-time option --enable-fix-cortex-a53-843419 that pass down
the linker option --fix-cortex-a53-843419.

I haven't implemented flags to explicitly disable/enable it during
compilation as it is only a linker workaround, but I can do it if you
think it's necessary.

https://sourceware.org/ml/binutils-cvs/2015-04/msg00012.html

Is it ok for trunk and/or branches ?

Thanks,
Yvan

2015-05-01  Yvan Roux  <yvan.roux@linaro.org>

    * configure.ac: Add --enable-fix-cortex-a53-843419 option.
    * configure: Regenerate.
    * config/aarch64/aarch64-elf-raw.h (CA53_ERR_843419_SPEC): Define.
    (LINK_SPEC): Include CA53_ERR_843419_SPEC.
    * config/aarch64/aarch64-linux.h (CA53_ERR_843419_SPEC): Define.
    (LINK_SPEC): Include CA53_ERR_843419_SPEC.
    * doc/install.texi (aarch64*-*-*): Document
    new --enable-fix-cortex-a53-843419 option.

Attachment: erratum-843419.diff
Description: Text document