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Subject: Re: [PATCH] powerpc/powernv/prd: Validate whether address to be
 mapped is part of system RAM
To: Jeremy Kerr <jk@ozlabs.org>, linuxppc-dev@ozlabs.org
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From: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Date: Thu, 3 Oct 2019 11:01:02 +0530
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On 10/3/19 10:26 AM, Jeremy Kerr wrote:
> Hi Vasant,
> 
>> Correct. We will have `ibm,prd-label` property. That's not the issue.
> 
> It sure sounds like the issue - someone has represented a range that
> should be mapped by HBRT, but isn't appropriate for mapping by HBRT.
> 
>> Here issueis HBRT is loaded into NVDIMM memory.
> 
> OK. How about we just don't do that?

Yes. Hostboot will fix that. It will make sure that HBRT is loaded into regular 
memory.

> 
> It sounds like we're just trying to work around an invalid
> representation of the mappings.

Its not workaround. Its additional check. So that we don't mmap() if HBRT is not 
in system RAM
and throw proper error.. So that debugging becomes easy.

-Vasant