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From: Michael Zimmermann <sigmaepsilon92@gmail.com>
Date: Sun, 25 Sep 2016 21:01:43 +0200
Message-ID: <CAN9vWDJYp6MKuri+pOsUoxpdZZfC6Yuj52L6OzVtjXA9w7uSsg@mail.gmail.com>
To: "edk2-devel@lists.01.org" <edk2-devel@ml01.01.org>,
 Ard Biesheuvel <ard.biesheuvel@linaro.org>, 
 Leif Lindholm <leif.lindholm@linaro.org>
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Subject: System hang when using SetMemoryAttributes
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Hi,

which side effects can SetMemoryAttributes have?
I have a device where setting the framebuffer(which is part of DRAM)
to EFI_MEMORY_UC makes UEFI hang later on(when already outside the lcd
driver).

If I do the same on a memory range allocated with AllocateAnyPages instead
of AllocateAddress UEFI boots just fine(but ofc, the screen doesn't work).

Unfortunately I don't have UART on that device but I'm sure there's no
assert because I configured DebugLib to reboot the device in that case -
which never happens, it's just stuck when the console drivers(TerminalDxe
etc) initialize later on.

Thanks
Michael