public inbox for devel@edk2.groups.io
 help / color / mirror / Atom feed
From: Michael Zimmermann <sigmaepsilon92@gmail.com>
To: "edk2-devel@lists.01.org" <edk2-devel@ml01.01.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: post-ExitBootServices memory protection of RT_Data (ARM)
Date: Fri, 2 Sep 2016 15:08:48 +0200	[thread overview]
Message-ID: <CAN9vWD+R=qDjNAWNB2OEy3T+K8Dk0QPnzyJkCAJ6pZW2=4O=1Q@mail.gmail.com> (raw)

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


             reply	other threads:[~2016-09-02 13:08 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-02 13:08 Michael Zimmermann [this message]
2016-09-02 20:30 ` post-ExitBootServices memory protection of RT_Data (ARM) Laszlo Ersek
2016-09-02 20:45   ` Michael Zimmermann
2016-09-02 21:02     ` Ard Biesheuvel
2016-09-03  4:04       ` Michael Zimmermann

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-list from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAN9vWD+R=qDjNAWNB2OEy3T+K8Dk0QPnzyJkCAJ6pZW2=4O=1Q@mail.gmail.com' \
    --to=devel@edk2.groups.io \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox