Applying DTB Overlays from ATF on RZ/G2

[Marek Vasut]

On 1/5/23 00:48, Heinrich Schuchardt wrote:
> Am 5. Januar 2023 00:19:36 MEZ schrieb Adam Ford <aford173 at gmail.com>:
>> On Wed, Jan 4, 2023 at 5:15 PM Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>>>
>>> On 1/4/23 22:35, Adam Ford wrote:
>>>> ATF generates a couple memory nodes based on how it's compiled and
>>>> generates a reserved-memory node, and I want to overlay it with the
>>>> device tree so Linux knows about this reserved memory.
>>>>
>>>> When I boot U-Boot, I can read the reserved-memory node:
>>>>
>>>> => fdt addr 0xe631e588
>>>> Working FDT set to e631e588
>>>> => fdt print /reserved-memory
>>>> reserved-memory {
>>>> lossy-decompression at 54000000 {
>>>> renesas,formats = <0x00000000>;
>>>> no-map;
>>>> reg = <0x00000000 0x54000000 0x00000000 0x03000000>;
>>>> compatible = "renesas,lossy-decompression", "shared-dma-pool";
>>>> };
>>>> };
>>>> =>
>>>>
>>>> I attempt to overlay it with the following:
>>>>
>>>> => run loadfdt
>>>> 65932 bytes read in 6 ms (10.5 MiB/s)
>>>> => fdt addr $load_addr
>>>
>>> When actually setting the address you will see a message "Working FDT
>>> set to %lx\n". So I assume $load_addr is empty.
>>>
>>> Did you mean $loadaddr or $fileaddr?
>>
>> Opps, that was a copy-paste error.  Even with that, I still get the
>> failure to overlay:
>>
> 
> Did you load a .dtbo file to apply? You cannot apply a devicetree.
> 
> Is the fdt that you want to apply the overlay to built with symbols (dtc parameter -@)?

Note that the fragment passed to U-Boot by upstream ATF is already 
automatically merged into the U-Boot control DT (see 
board/renesas/rcar-common/common.c ) . U-Boot should pass that on to 
Linux automatically.