From: Scott Wood [mailto:oss@buserror.net] Sent: Saturday, January 23, 2016 1:48 AM On Fri, 2016-01-22 at 20:14 +0000, 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.
So then we need a different dts based on whether PPA is loaded? No thanks.
For e.g the current LS2080A DTS has no separate node for PSCI, the same can be patched-up/added by the Bootloader.
The cpu.enable_method needs to be changed from spin-table to psci as
well.
Right, that's part of updating the devicetree to indicate the presence of PSCI.
Similarly the cpu.enable-method is also empty in the LS2080A DTS to allow Bootloader to patch it accordingly.
Please see: http://lxr.free-electrons.com/source/arch/arm64/boot/dts/freescale/fsl-ls208...
See http://lxr.free-electrons.com/source/Documentation/devicetree/bindings /a rm/psci.txt for details.
I'm familiar with the binding.
Regards, Bhupesh