Re: System hang when using SetMemoryAttributes

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

On 26 September 2016 at 00:44, Michael Zimmermann
<sigmaepsilon92@gmail.com> wrote:
> oh and in case it makes a difference: it's a 64bit ARM device running 32bit
> code.
>

That shouldn't matter.

> On Mon, Sep 26, 2016 at 9:13 AM, Michael Zimmermann
> <sigmaepsilon92@gmail.com> wrote:
>>
>> Ard,
>>
>> I have to mark the framebuffer as uncached, because if writes to it are
>> cached, they don't instantly reach the underlying hardware. I'd have to
>> manually flush the cache for that region every time otherwise.
>>
>> Isn't that the normal way? I don't think that any device would work with a
>> write-cache framebuffer - I actually copied the code from the ArmVirt LCD
>> drivers which do the same.
>>

_WC means write-combining, and so these accesses are not cacheable,
but they do allow unaligned accesses, unlike _UC