[PATCH u-boot-marvell] PLEASE TEST ddr: marvell: a38x: fix SPLIT_OUT_MIX state decision

[Chris Packham]

On Wed, Jan 5, 2022 at 10:10 PM Marek Behún <kabel at kernel.org> wrote:
>
> On Wed, 5 Jan 2022 11:10:51 +1300
> Chris Packham <judge.packham at gmail.com> wrote:
>
> > Hi Marek,
> >
> > On Wed, Jan 5, 2022 at 9:28 AM Marek Behún <kabel at kernel.org> wrote:
> > >
> > > From: Marek Behún <marek.behun at nic.cz>
> > >
> > > Hello,
> > >
> > > continuing my  last discussion with Chris [1] about this, could you
> > > please test this change? (For Chris, mainly on your x530, since last
> > > time you said it hanged your board in SPL.)
> >
> > I still get a hang after "Returning to BootROM (return address
> > 0xffff05c4)... " (after the DDR training).
>
> Hi Chris,
>
> would it be possible for me to connect to a computer to which the x530
> is connected via UART so that I can debug it? Could you prepare such an
> environment? It would also need a mechanism to reset the board remotely
> somehow. I prepared a similar remote debugging environment for Marvell
> when they were solving some issues for us.
>
> If not, then I guess we will just have to send debugging code and
> results back and forth.
>
> Marek

It might be possible. We can probably set something up to be internet
accessible and have remotely controllable PDUs. Unfortunately most of
the people who can set this up are still on holiday and by the time we
get that sorted I'll be on leave again.

In terms of the actual problem the plot thickens. The board I had been
testing with was a production unit with MV88F6820-B0 at 1600 MHz (DDR
800MHz). To debug the hang I wanted to attach a JTAG debugger so I
found an old prototype that had the JTAG header fitted, but the
problem didn't occur. The older prototype has MV88F6820-A0 at 1866 MHz
(DDR 933MHz) (as well as the usual collection of re-work wires that
prototypes often accumulate). I don't know if the A0 vs B0 differences
are significant or if the clock speed has some impact.

I'll get the JTAG header fitted to my production unit and see where I get to.