[PATCH 1/2] fsl-layerscape: add dtb overlay feature

Sahil Malhotra (OSS) sahil.malhotra at oss.nxp.com
Wed Nov 17 19:11:11 CET 2021

Hi Michael,

-----Original Message-----
From: Michael Walle <michael at walle.cc> 
Sent: Wednesday, November 17, 2021 1:23 PM
To: Sahil Malhotra (OSS) <sahil.malhotra at oss.nxp.com>
Cc: Clément Faure <clement.faure at nxp.com>; Gaurav Jain <gaurav.jain at nxp.com>; Pankaj Gupta <pankaj.gupta at nxp.com>; Priyanka Jain <priyanka.jain at nxp.com>; Sahil Malhotra <sahil.malhotra at nxp.com>; u-boot at lists.denx.de; Varun Sethi <V.Sethi at nxp.com>; Ye Li <ye.li at nxp.com>; Michael Walle <michael at walle.cc>
Subject: Re: [PATCH 1/2] fsl-layerscape: add dtb overlay feature

> From: Sahil Malhotra <sahil.malhotra at nxp.com>
> This patch enables the DTB overlay feature for LS platforms.

> Could you please add some description what this is doing and for what this is intended? To have a "DTB overlay feature", it is enough to just enable CONFIG_OF_LIBFDT_OVERLAY.
I will add some description, and yes for DTB overlay feature, it is enough to enable CONFIG_OF_LIBFDT_OVERLAY but we need to do this step before booting the kernel that's why also have to enable CONFIG_OF_SYSTEM_SETUP.

>Apparently you're adding an overlay passed by optee. Doesn't this have to be applied to u-boot's control dtb too?
Yes, we will be applying the overlay passed by optee, yes it will be applied to dtb which will be passed to uboot for kernel booting.


Sahil Malhotra

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