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

[Michael Walle]

Hi Sahil,

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 ?

But then u-boot has the "wrong" dtb. What is the reason, there is an
overlay instead of a whole dtb? what if the overlay doesn't match
the dtb?

-michael