Re: Getting serial console output on new imx7d tqma7 board UART4

From: Sascha Hauer <s.hauer@pengutronix.de>
To: Lars Pedersen <lapeddk@gmail.com>
Cc: barebox@lists.infradead.org, Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: Re: Getting serial console output on new imx7d tqma7 board UART4
Date: Mon, 10 Aug 2020 10:00:18 +0200	[thread overview]
Message-ID: <20200810080018.GX31536@pengutronix.de> (raw)
In-Reply-To: <CAKd8=GvnrpFHDGx2Sm2ri+JJA4f6NngMA4L-kcZP-d-87nbPRA@mail.gmail.com>

On Wed, Aug 05, 2020 at 05:00:06PM +0200, Lars Pedersen wrote:
> Hi. Thanks for your patience :D
> 
> /Lars Pedersen
> 
> On Wed, 5 Aug 2020 at 14:30, Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
> >
> > Hello,
> >
> > On 8/5/20 1:12 PM, Lars Pedersen wrote:
> > >> Text base is ignored, when you are relocatable. If you aren't relocatable,
> > >> you need a valid address as your text base. Why did you turn it off?
> > >
> > > I didn't turn it off. It isn't selected by MACH_FREESCALE_MX7_SABRESD
> > > so it gets turned off if only this board is used. It is selected by 6
> > > other boards, which is the reason it works when compiling for all
> > > boards.
> >
> > I don't think that's how it works. If it was =y and the select went
> > away because of CONFIG_MACH_CCMX51=n, it remains at =y. I just tested
> > it and that's the behavior I observed.
> 
> If I use the imx_v7_defconfig and go and deselect  "ConnectCore
> i.MX51" (MACH_CCMX51), then RELOCATABLE will change from =y to =n
> 
> So in other words. Deselecting this one board (MACH_CCMX51) will set
> RELOCATABLE=n and now all the boards rely on CONFIG_TEXT_BASE to be
> set correct. And as you also mentioned later on, this will be an
> issue.

That's strange. I can confirm what Ahmad said: starting from
imx_v7_defconfig and deselecting MACH_CCMX51 still leaves RELOCATABLE
enabled here. I have no idea why this is different for you.

Anyway, on i.MX a barebox binary with RELOCATABLE disabled only works in
very special cases and requires setting TEXT_BASE to a suitable value,
one that works on all boards selected. It would be nice to hide
RELOCATABLE from the user in most cases.

Sascha

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