On 01/22/2016 12:14 PM, Bhupesh Sharma wrote:
-----Original Message----- From: Scott Wood [mailto:oss@buserror.net] Sent: Saturday, January 23, 2016 1:39 AM To: york sun; Zhiqiang Hou; u-boot@lists.denx.de; albert.u.boot@aribaud.net; Mingkai.hu@freescale.com; Stuart Yoder; leoli@freescale.com; prabhakar@freescale.com; bhupesh.sharma@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/p... 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.
York