From: Scott Wood <oss@buserror.net>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCHv2 2/3] ARMv8/layerscape: Add FSL PPA support
Date: Fri, 22 Jan 2016 14:21:32 -0600 [thread overview]
Message-ID: <1453494092.27129.4.camel@buserror.net> (raw)
In-Reply-To: <AM4PR0401MB1732E5EBABD2B77E66FCDBEB9AC40@AM4PR0401MB1732.eurprd04.prod.outlook.com>
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:oss at buserror.net]
> > > Sent: Saturday, January 23, 2016 1:39 AM
> > > To: york sun; Zhiqiang Hou; u-boot at lists.denx.de;
> > > albert.u.boot at aribaud.net; Mingkai.hu at freescale.com; Stuart Yoder;
> > > leoli at freescale.com; prabhakar at freescale.com;
> > > bhupesh.sharma at freescale.com; 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 <Zhiqiang.Hou@freescale.com>
> > > > >
> > > > > 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 <Zhiqiang.Hou@freescale.com>
> > > > > ---
> > > > > 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/bindings
> > /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.
How would U-Boot know what version of PSCI the loaded PPA supports? Is or
could there be any metadata on the PPA image to convey such information?
-Scott
next prev parent reply other threads:[~2016-01-22 20:21 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 9:44 [U-Boot] [PATCHv2 1/3] armv8: fsl-layerscape: add i/d-cache enable function to enable_caches Zhiqiang Hou
2016-01-21 9:44 ` [U-Boot] [PATCHv2 2/3] ARMv8/layerscape: Add FSL PPA support Zhiqiang Hou
2016-01-22 20:05 ` york sun
2016-01-22 20:09 ` Scott Wood
2016-01-22 20:14 ` Bhupesh Sharma
2016-01-22 20:17 ` Scott Wood
2016-01-22 20:26 ` Bhupesh Sharma
2016-01-25 3:11 ` Zhiqiang Hou
2016-01-22 20:18 ` york sun
2016-01-22 20:21 ` Scott Wood [this message]
2016-01-22 20:27 ` Bhupesh Sharma
2016-01-22 20:30 ` york sun
2016-01-25 3:22 ` Zhiqiang Hou
2016-03-17 21:09 ` york sun
2016-03-23 3:17 ` Zhiqiang Hou
2016-01-22 20:32 ` Scott Wood
2016-01-25 3:15 ` Zhiqiang Hou
2016-01-25 3:16 ` Zhiqiang Hou
2016-01-25 3:09 ` Zhiqiang Hou
2016-01-25 3:02 ` Zhiqiang Hou
2016-01-21 9:44 ` [U-Boot] [PATCHv2 3/3] ARMv8/ls1043ardb: Integrate FSL PPA Zhiqiang Hou
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