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

[Sahil Malhotra (OSS)]

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.

-michael

Regards,
Sahil Malhotra