On 01/22/2016 12:27 PM, Bhupesh Sharma wrote: > > >> -----Original Message----- >> From: Scott Wood [mailto:[email protected]] >> Sent: Saturday, January 23, 2016 1:52 AM >> To: york sun; Bhupesh Sharma; Zhiqiang Hou; [email protected]; >> [email protected]; [email protected]; Stuart Yoder; >> [email protected]; [email protected]; >> [email protected]; Zhiqiang Hou >> Subject: Re: [PATCHv2 2/3] ARMv8/layerscape: Add FSL PPA support >> >> On Fri, 2016-01-22 at 20:18 +0000, york sun wrote: >>> On 01/22/2016 12:14 PM, Bhupesh Sharma wrote: >>>> >>>> >>>>> -----Original Message----- >>>>> From: Scott Wood [mailto:[email protected]] >>>>> Sent: Saturday, January 23, 2016 1:39 AM >>>>> To: york sun; Zhiqiang Hou; [email protected]; >>>>> [email protected]; [email protected]; Stuart Yoder; >>>>> [email protected]; [email protected]; >>>>> [email protected]; Zhiqiang Hou >>>>> Subject: Re: [PATCHv2 2/3] ARMv8/layerscape: Add FSL PPA support >>>>> >>>>> On Fri, 2016-01-22 at 20:05 +0000, york sun wrote: >>>>>> On 01/21/2016 01:53 AM, Zhiqiang Hou wrote: >>>>>>> From: Hou Zhiqiang <[email protected]> >>>>>>> >>>>>>> The FSL Primary Protected Application (PPA) is a software >>>>>>> component loaded during boot which runs in TrustZone and >>>>>>> remains resident after boot. >>>>>>> >>>>>>> Signed-off-by: Hou Zhiqiang <[email protected]> >>>>>>> --- >>>>>>> Tested on LS1043A RDB board >>>>>>> >>>>>> >>>>>> I presume PSCI is implemented in PPA. How does the SMP boot flow >>>>>> change with PPA? U-boot has to remain functional in the absence >>>>>> of PPA, >>>>> right? >>>>>> >>>>>> Would it be possible to write a readme for PPA? >>>>> >>>>> Also, how does the devicetree get updated to indicate the presence >>>>> of PSCI? >>>>> >>>> >>>> One needs to add PSCI node in the DTS for the same, claiming support >>>> for PSCI specification. >>>> The cpu.enable_method needs to be changed from spin-table to psci as >> well. >>>> >>>> See >>>> http://lxr.free-electrons.com/source/Documentation/devicetree/bindin >>>> gs >>>> /arm/psci.txt for details. >>>> >>> >>> Bhupesh, >>> >>> Before PPA is fully adopted, u-boot has to detect the existence of PPA >>> and decide to use PSCI or spin table, right? So the device tree node >>> should also be fixed accordingly. > > A static CONFIG_ flag is used for enabling the PPA support currently in > QorIQ-LS u-boot code.
Not enough. The driver parse PPA image and gives up if it is not a valid image. Before we have a way to deploy PPA image to all our customers, we need to keep both options open. York _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
