Hi Rod and Chenhui, Can you help to answer the questions about PSCI and PPA?
> -----Original Message----- > From: york sun > Sent: 2016年1月23日 4:30 > To: Bhupesh Sharma <[email protected]>; Scott Wood > <[email protected]>; Zhiqiang Hou <[email protected]>; u- > [email protected]; [email protected]; [email protected]; > Stuart Yoder <[email protected]>; [email protected]; > [email protected]; [email protected]; Zhiqiang Hou > <[email protected]> > Subject: Re: [PATCHv2 2/3] ARMv8/layerscape: Add FSL PPA support > > 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/bindi > >>>> n > >>>> 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. > Chenhui is working on it. Thanks, Zhiqiang _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
