[PATCH v2 2/2] Makefile: Don't allow new boards with SPL_FIT_GENERATOR

[Simon Glass]

Hi Mark,

On Tue, 1 Feb 2022 at 09:08, Mark Kettenis <mark.kettenis at xs4all.nl> wrote:
>
> > From: Simon Glass <sjg at chromium.org>
> > Date: Tue, 1 Feb 2022 08:42:35 -0700
> >
> > It seems that rk3399 uses bl31.elf and splits out the sections into
> > pieces. What a mess! I wonder if that is necessary for ATF to work? It
> > seems to do the same for TEE.
>
> That's because bl31.elf really consists of three binary blobs packed
> together into a single ELF object.  This is done such that specific
> bits needed for suspend/resume land in the AP's SRAM and the PMU's
> SRAM while the majority lands in DRAM.  The splitting happens to make
> U-Boot's ITS stuff happy.

OK I see, thanks. I hadn't realised it was running from SDRAM. I
suppose SPL has set that up already. It would help if I could get my
firefly-rk3399 unblocked.

>
> I suppose this could be done in a different way by packing the ELF
> binary itself into the FIT image, but then SPL has to parse the ELF
> headers and copy things in place which may be challenging.

We do have code for that which we could press into service, but it
goes against the idea of SPL a bit, I think, when you can do it in
advance.

>
> (I'm not familliar with the TEE stuff)

Well if we need to do it for BL31, it is not really any more effort to
do it for TEE, I suppose.

Regards,
Simon