[U-Boot] [RFC PATCH v1 1/2] armv8: fsl-layerscape: Reserve memory for PPA

[York Sun]

On 11/10/2015 11:52 AM, Wolfgang Denk wrote:
> Dear York,
> 
> In message <5642490C.9090407 at freescale.com> you wrote:
>>
>>>> +- CONFIG_FSL_PPA_RESERVED_DRAM_SIZE
>>>> +	If defined, this is reserved in highest address as secure memory
>>>
>>> What is Freescale-specific about the concept of reserving memory for a secure
>>> monitor?
>>
>> The PPA is a Freescale implementation of TrustZone application.
> 
> That does not answer the question.  What is so special here that you
> cannot use the existing CONFIG_PRAM ?
> 

CONFIG_PRAM is reserved from the top of u-boot memory, which is not necessarily
the real top of memory.

I am putting this reserved memory under the name
CONFIG_FSL_PPA_RESERVED_DRAM_SIZE for now, because I don't know if this will
serve other SoCs. I would use a generic solution if I don't have MC and debug
server in my way. I am open to suggestions.

York