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From: Michael Zimmermann <sigmaepsilon92@gmail.com>
Date: Fri, 2 Sep 2016 15:08:48 +0200
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To: "edk2-devel@lists.01.org" <edk2-devel@ml01.01.org>,
 Ard Biesheuvel <ard.biesheuvel@linaro.org>
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Subject: post-ExitBootServices memory protection of RT_Data (ARM)
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Hi,

a friend of mine works with a hacked Luma WP device. he can already boot
Android by replacing UEFI with a linux bootloader.
What would be nice however is using UEFI's LinuxLoader. The problem with
that seems to be that even after ExitBootServices, booting linux from
addresses previously allocated as RT_Data seems to just not work(no UART
output etc and we don't have jtag).

So, how can UEFI have such an influence at that point? Is there a ARM/TZ
feature for that? Can it be disabled?
I thought respecting the memory map would just be needed in case you want
to be able to call RuntimeServices and that you don't need to do that if
you don't need them.

Thanks
Michael