From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Michael Zimmermann <sigmaepsilon92@gmail.com>
Cc: "edk2-devel@lists.01.org" <edk2-devel@ml01.01.org>,
Leif Lindholm <leif.lindholm@linaro.org>
Subject: Re: System hang when using SetMemoryAttributes
Date: Mon, 26 Sep 2016 05:47:05 -0700 [thread overview]
Message-ID: <CAKv+Gu-EFH_5yA-kE3YhqrD4PBE8rnFRLvq=Hi54WmTZkwNR1Q@mail.gmail.com> (raw)
In-Reply-To: <CAN9vWDJf6=dFj04-HME_V6PW3A0_UT4ZLJWaUczAc0S6t9BjfQ@mail.gmail.com>
On 26 September 2016 at 05:44, Michael Zimmermann
<sigmaepsilon92@gmail.com> wrote:
> I'm thankful for the hint about _WC because it drastically improves the
> speed on my other devices.
Glad I could be of help.
> Unfortunately, it doesn't fix the device I have problems with. I tested all
> possible attributes and only EFI_MEMORY_WB seems to be working(even
> EFI_MEMORY_WT is broken).
>
> The weird thing is that even if I disable accesses to the framebuffer by
> disabling all code in the Blt function, it hangs during boot.
> I really can't explain this behavior.
>
Are you saying your framebuffer does work with cached attributes? That
would mean the graphics device is DMA coherent, which is actually a
good thing. What hardware are we talking about here?
next prev parent reply other threads:[~2016-09-26 12:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-25 19:01 System hang when using SetMemoryAttributes Michael Zimmermann
2016-09-26 6:35 ` Ard Biesheuvel
2016-09-26 7:13 ` Michael Zimmermann
2016-09-26 7:44 ` Michael Zimmermann
2016-09-26 10:23 ` Ard Biesheuvel
2016-09-26 12:44 ` Michael Zimmermann
2016-09-26 12:47 ` Ard Biesheuvel [this message]
2016-09-26 12:52 ` Michael Zimmermann
2016-09-26 17:00 ` Ard Biesheuvel
2016-09-26 20:25 ` Michael Zimmermann
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