exynos5420/arndale-octa: imprecise external aborts on exynos_defconfig

[Tyler Baker]

Exynos5420-based Arndale octa boards have recently started failing boot
tests due to imprecise external aborts.  This only appears to happen
when using exynos_defconfig and boots fine with multi_v7_defconfig.  The
issue seems to be intermittent, so is not reliably reproducable and
difficult to bisect.  Here are a few boot logs from recent
mainline/linux-next kernels that are failing:

mainline/v3.17-rc3-165-g56c2285:
    http://armv7.com/scheduler/job/5525/log_file#L_59_276

mainline/v3.17-rc3-176-g2b12164:
    http://armv7.com/scheduler/job/5595/log_file#L_59_278

mainline/v3.17-rc4-131-gd030671:
    http://armv7.com/scheduler/job/5770/log_file#L_193_277

mainline/v3.17-rc4-146-g619df5d:
    http://armv7.com/scheduler/job/6014/log_file#L_124_0

next/20140908:
    http://armv7.com/scheduler/job/5815/log_file#L_59_276

next/20140910:
    http://armv7.com/scheduler/job/6161/log_file#L_59_278

The ramdisk is used is a very minimal open embedded based filesystem,
which can be found here:

http://images.armcloud.us/lava/common/linaro-image-minimal-initramfs-genericarmv7a.cpio.gz.u-boot

Please let me know if any more information is needed to help
reproduce. If/when a root cause is determined, I am more than willing
to assist in testing any fixes provided.

Thanks,

-- 
Tyler Baker
Tech Lead, LAVA
Linaro.org | Open source software for ARM SoCs
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