[bug report] staging: add bcm2708 vchiq driver

[Phil Elwell]

On 16/11/2016 10:21, Dan Carpenter wrote:
> On Tue, Nov 15, 2016 at 10:04:05PM -0500, Vince Weaver wrote:
>> On Tue, 15 Nov 2016, Michael Zoran wrote:
>>
>>> I'm still interested to know more about the MMU statement.  I would
>>> think at least some of the RPI models have one because swapping appears
>>> to be at least somewhat functional on the later models.
>> All Raspberry Pi models have an MMU.  I'm not sure why anyone thinks
>> otherwise.
> No idea.  Someone told me that when I complained about a different
> security bug on RPI.
The ARM cores have MMUs between them and the SoC bus, but the VC4 VPU
and its peripherals do not, leading to the need for contiguous
allocations. Some VPU peripherals can only address 256MB of RAM, which
further constrains allocations.