[Skiboot] [PATCH skiboot] npu2: Clear fence on all bricks

Reza Arbab arbab at linux.ibm.com
Tue Dec 10 09:21:18 AEDT 2019

On 02/12/2019 13:05, Alexey Kardashevskiy wrote:
> On 30/11/2019 03:47, Reza Arbab wrote:
>> On Fri, Nov 22, 2019 at 11:04:22AM +1100, Alexey Kardashevskiy wrote:
>> Each GPU has a 640kb protected region which will result in a
>> "unsupported request" (UR) response. The root bug is that the driver
>> maps and accidentally accesses that area.
> Oh. Is this address range described anywhere? We could disable mapping
> these as a precaution measure.

It's only been communicated to us ad hoc during bug investigation, as 
far as I know. I'm going to try requesting documentation of all 
cpu-access-limited regions so we have something to refer to.

Reza Arbab

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