Getting serial console output on new imx7d tqma7 board UART4

[Lars Pedersen]

Thanks for the feedback.

I will order an i.MX7 EVK board and try to get it working. I guess
that we were a little too confident that the TQma7d board would work
out of the box with only minor tweaks.

/Lars Pedersen

On Thu, 30 Jul 2020 at 15:55, Ahmad Fatoum <a.fatoum at pengutronix.de> wrote:
>
> Hi,
>
> On 7/30/20 12:16 PM, Lars Pedersen wrote:
> > Thanks for the quick response :) I have made some inline comments
> >
> > Additionally I have fixed the __dtb_z_ unrelated issue, but still
> > troubles to get some output. Could you maybe send me a barebox binary
> > for an mx6 or mx7 board? I'm still unsure if it has the correct binary
> > format.
>
> Can you not compile a i.MX7-EVK barebox and run it on the EVK?
> If this doesn't work, this is a different issue.
>
>
> > My current Kconfig values look like this. Maybe you can see something
> > missing.I have patched drivers/regulator/Kconfig (ARCH_IMX7) so that I
> > can enable REGULATOR_PFUZE, which is used on the tqma7d board. From
> > what I can see the NXP i.MX7 SabreSD board uses a PF3000 PMIC too so
> > iam unsure why it can work without this fix.
>
> DEBUG_LL lets barebox print a > symbol first thing it boots. This should
> work for you regardless of any PMIC configuration.
>
> >>> So I guess that the DCD table part now should be correct. So the
> >>> question is if this is and lowlevel.c/board.c boilerplate issue or
> >>> maybe I need something in the Kconfig menu.
> >>
> >> Enable CONFIG_DEBUG_LL and see how far barebox comes.
> >> See the inline comment from my last mail.
> >
> > I missed some of the last comments but I have already enabled
> > CONFIG_DEBUG_LL and can't get any console output to appear. UART4 has
> > been selected in the menu for this.
>
> Then that's what you need to focus on. Prior to that '>', not much
> code has run. If you don't come that far, chances are you set up your serial port
> wrong (looks correct to me though) or your DCD table is wrong...
>
> Cheers,
> Ahmad
>
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