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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: 827700b7-80ef-4a4b-85be-08d9c5f0b8a2 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Dec 2021 08:46:32.7978 (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: OtCaAbX6lEvAW68wflN447XnEC2bVb1ZzZTCXCORq5lloFJw0EAKqrkfAtWNDfy+AtLZFWFybZ4C3/PxtFbmBQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR04MB7594 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.38 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: U-Boot On Behalf Of Michael Walle > Sent: Monday, December 20, 2021 6:23 PM > To: Sahil Malhotra (OSS) > Cc: ZHIZHIKIN Andrey ; Cl=E9ment > Faure ; Gaurav Jain ; > Pankaj Gupta ; Priyanka Jain > ; u-boot@lists.denx.de; Varun Sethi > ; Ye Li > Subject: [EXT] Re: [PATCH 1/2] fsl-layerscape: add dtb overlay feature >=20 > Caution: EXT Email >=20 > Hi Sahil, >=20 > Am 2021-12-10 07:33, schrieb Sahil Malhotra (OSS): > >> DT nodes can be statically disabled if we know that they are held by > >> HAB and are not released to NS World. > >> > >> OP-TEE does set the status itself via dt_enable_secure_status(), > >> which should present the properly configured FDT when U-Boot takes > over. > > Yes, OP-TEE set the status by dt_enable_secure_status() in DTB overlay > > which gets merged with DTB provided for Linux bootup and then Linux > > boots with merged DTB. > > But u-boot uses the DTB embedded in its image. How can we modify that > > DTB or merge DTB overlay passed by OP-TEE with uboot DTB ? >=20 > But then u-boot has the "wrong" dtb. What is the reason, there is an over= lay > instead of a whole dtb? what if the overlay doesn't match the dtb? "wrong" dtb means that uboot will not be aware of CAAM job ring which is ta= ken by OP-TEE and uboot on LS platforms currently use JR0, which is not being used= by any other entity in LS bootflow. We don't use DTB in OP-TEE, but when we use CAAM in OP-TEE, OP-TEE reserves One Job Ring for its use and that is communicated to Kernel using DTB overl= ay. > what if the overlay doesn't match the dtb? I didn't get this point, can you please elaborate a little. Regards, Sahil Malhotra