Re: [PATCH 4/4] doc: board: mediatek: document Genio 700 SPL boot

[Carlo Caione via U-Boot <u-boot@lists.u-boot-project.org>]

On Tue Jul 21, 2026 at 4:50 PM CEST, David Lechner wrote:

>>>> +Using Genio Tools
>>>> +~~~~~~~~~~~~~~~~~
>>>
>>> Probably deserves an external link on where to get genio-tools and pre-build
>>> images.
>> 
>> I'll add a link for the genio-tools. About the pre-build images there is
>> no place the user can download them from (for now), they are currently
>> compiled as part of the yocto image / distro.
>> 
> I was thinking of https://genio.mediatek.com/doc/iot-yocto/latest/sw/yocto/download.html

Ok, I'm just realizing that I was probably not clear enough on this
point.

That prebuilt image you can download at that link, is indeed usable as
the image directory passed to genio-flash: it provides the partition
metadata and the lk.bin download bootstrap. We have tested that
arrangement, overriding the primary boot artifacts with the newly built
mtk-boot.bin and bootloaders.img (output from this patchset) and it
works correctly.

It cannot, however, provide the external DDR-loader input required to
build these new images. The currently published image contains bl2.img,
which is the legacy monolithic TF-A BL2. After initializing DDR it loads
and parses fip.bin; it does not copy an appended U-Boot SPL from the
fixed offset and enter it at CONFIG_SPL_TEXT_BASE. It therefore cannot
be used as ddr-loader.bin.

The Yocto integration I mentioned generates the compatible DDR loader
and the remaining inputs for the new boot chain (and inputs to the
binman processing in U-Boot), but that work is not merged or published
yet (but it will be, hopefully soon :)

So bottom line is that if you want to use this new SPL, you also need
some kind of special DDR loader firmware that is generated by a not-yet
but soon-to-be available yocto release.

I'll try to clarify better this point in V2 (and I hope this is more
clear now).

Cheers,

--
Carlo Caione