latest u-boot branch for Marvell Armada 88F3720

[Marek Behun <marek.behun@nic.cz>]

Hi,

mainline U-Boot should work for Armada 3720, although I haven't tested
recent master (so I don't know if there are some regressions). But
Turris Mox uses cca 1 year old upstream with just few Mox specific
patches atop (which I plan to get merged soon). You can find it here:
https://gitlab.labs.nic.cz/turris/mox-u-boot

One thing that may need reworking (to become compatible with Linux) is
the comphy driver. Linux' comphy driver for this SOC uses smccc calls
to ARM Trusted Firmware, but U-Boot does not, and instead initializes
SERDESes on its own.

Bear in mind that U-Boot is not enough for booting Armada 3720 SOC. You
do also need ARM Trusted Firmware (you don't need to use Marvell's
ATF, since their patches are merged into upstream ATF), and you also
need firmware for the secure Cortex-M3 processor (Marvell's name for
this firmware is WTMI), which does DDR training. Marvell has this in
A3700-utils-marvell repository. For Turris MOX, we build all of this via
https://gitlab.labs.nic.cz/turris/mox-boot-builder
but this code can be MOX specific, so if you want to use it for other
boards, I can provide more explanation of which does what and so on.

Marek

On Wed, 25 Mar 2020 17:44:57 +0100
Stefan Roese <sr@denx.de> wrote:

> Hi Moritz,
> 
> On 25.03.20 16:05, Moritz Berghof wrote:
> > My Name is Moritz and we evaluate the Marvell Armada 88F3720
> > on the Marvell ESPRESSObin and the TURRIS MOX.
> > 
> > Does someone know, where is the actual or latest u-boot branch
> > for Marvell Armada 88F3720 placed? At the u-boot master or a
> > marvell custodian tree or somewhere else? Does Marvell develop
> > u-boot still for their Armada 88F3720 and when yes, where?  
> 
> Those boards are supported in general in mainline U-Boot. Though I
> have to admit, that I didn't test any of those ports recently. I
> added Marek Behun to Cc, as he did submit most of the Turris Mox
> stuff and has more recent experience than I do.
> 
> > Because that https://github.com/MarvellEmbeddedProcessors/u-boot-marvell,
> > which is well used on the ESPRESSObin is NOT up-to-date. 4 Years ago,
> > last commit.  
> 
> I just took a quick glance at this repo and there are newer, more
> recent branches, e.g. "u-boot-2018.03-armada-18.12". But still, this
> is far away from mainline, I agree.
> 
> Perhaps someone else (Marek) can comment on the current status of
> mainline U-Boot on those boards? Is something missing? If yes, it
> would be great to get it ported to mainline.
> 
> Thanks,
> Stefan
> 
> > I'm searching an actual u-boot platform for my Chip.
> > 
> > 
> > I look forward to your reply, thank you very much,
> > 
> > --
> > Moritz Berghof
> > Software Engineer
> > Tel. +49 30 921028-209<tel:+49%C2%A030%C2%A0921028-204>
> > Fax +49 30 921028-020<tel:+49%C2%A030%C2%A0921028-020>
> > mberghof at phoenixcontact.com<mailto:mberghof@phoenixcontact.com>
> > www.phoenixcontact.com<http://www.phoenixcontact.com/>
> > 
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> > 
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