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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DB7PR04MB5322.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8208e7f9-b29e-4e75-769d-08d9b32f2129 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Nov 2021 11:55:24.9546 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: mOBFDJjK9rwPqSaoRqX8EcSS8hZzbZhxnOFSRoYfETHwDYZp5otiSRwbSBU18G7hJH/vxhhPQlhSUZ2b+BZZLA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0402MB2710 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.37 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.2 at phobos.denx.de X-Virus-Status: Clean Hi Michael, -----Original Message----- From: Michael Walle =20 Sent: Wednesday, November 17, 2021 11:51 PM To: Sahil Malhotra (OSS) Cc: Cl=E9ment Faure ; Gaurav Jain ; Pankaj Gupta ; Priyanka Jain ; u-boot@lists.denx.de; Varun Sethi ; Ye Li ; ZHIZHIKIN Andrey Subject: Re: [PATCH 1/2] fsl-layerscape: add dtb overlay feature Hi Sahil, Am 2021-11-17 19:11, schrieb Sahil Malhotra (OSS): >> Could you please add some description what this is doing and for what=20 >> this is intended? To have a "DTB overlay feature", it is enough to=20 >> just enable CONFIG_OF_LIBFDT_OVERLAY. > I will add some description, and yes for DTB overlay feature, it is=20 > enough to enable CONFIG_OF_LIBFDT_OVERLAY but we need to do this step=20 > before booting the kernel that's why also have to enable=20 > CONFIG_OF_SYSTEM_SETUP. > Ok. What will the overlay do? Could you give an example? This overlay will be disabling the crypto nodes which will be used by optee= in secure world, so that linux should not use it. >> Apparently you're adding an overlay passed by optee. Doesn't this=20 >> 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=20 > applied to dtb which will be passed to uboot for kernel booting. > If I read this patch correctly, you're modifying the DT before you jump t= o linux. But I was asking whether you also have to modify the DT which is u= sed by u-boot. Eg. if you disable some kind of crypto nodes (because optee = will use them in secure world), this also have to communicated to u-boot, n= ot only linux, no? Yes, I got your point now, and is very valid, but as of now for u-boot we a= re just using the first available node for communicating with CAAM leaving = other job rings as it is.=20 So we need not to apply overlay to DTB used by uboot. Regards, Sahil Malhotra