im8mn: Loading U-Boot via serial download mode

[Michael Nazzareno Trimarchi]

Hi

On Wed, Apr 20, 2022 at 11:29 PM Adam Ford <aford173 at gmail.com> wrote:
>
> On Wed, Apr 20, 2022 at 3:16 PM Fabio Estevam <festevam at gmail.com> wrote:
> >
> > Hi Michael,
> >
> > On Wed, Apr 20, 2022 at 4:53 PM Michael Nazzareno Trimarchi
> > <michael at amarulasolutions.com> wrote:
> >
> > >> Set CONFIG_ENV_IS_NOWHERE=y and rebuild.  It will likely boot.
> > >
> > >
> > > That code should be dropped because it's really buggy. We already sent several patches. I prefer some registered mechanism and not those board, arch etc function definition.
> >
> > Just to confirm: you are saying adding CONFIG_ENV_IS_NOWHERE=y is not
> > an acceptable solution and that a
> > a better solution needs to be implemented, correct?
> >
> > Care to point to previous patches that were sent to address this issue?
>
> This problem is the code in arch/arm/mach-imx/imx8m/soc.c:
>
> #if defined(CONFIG_IMX8MN) || defined(CONFIG_IMX8MP)
> struct rom_api *g_rom_api = (struct rom_api *)0x980;
>
> enum boot_device get_boot_device(void)
> <snip>
>
> get_boot_device() assumes that all users want the environmental
> variables to be stored in a different location depending on the boot
> device.  When booting from USB, none of the environmental variable
> locations are given, so nowhere is the only option.
>
> There is another issue where some people want their environmental
> variables in the same place all the time regardless of what the boot
> device was.  This code also breaks that functionality.
> For some reason it's only applied to 8MN and 8MP, so only their
> environment settings are affected and not 8MQ or 8MM.
>
> When I build, I just delete the function, so my environment is where I
> want it.  It's far from ideal, but there doesn't seem to be consensus.
>

This was the code posted to address it

https://www.mail-archive.com/u-boot@lists.denx.de/msg430587.html

If I remember

Michael

> adam
>
> >
> > Thanks



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Michael Nazzareno Trimarchi
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M. +39 347 913 2170
michael at amarulasolutions.com
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