Question about uboot initialisation

[Simon Glass]

Hi Aubin,

On Fri, 26 Aug 2022 at 06:41, momo aubin <aubinno at gmail.com> wrote:
>
> Dear all,
>
>
> Is there any way that allows us to know that uboot has initialised all his
> peripherals before starting loading kernel ?
>
> The goal of this check is to reset the board in case of bad initialisation
> and choose a different uboot .
>
> Thanks for your answer in advance.
> Aubin

If there is a failure then it likely results in an error-return code
from board_init_f() or board_init_r(). These generally halt U-Boot /
cause a reboot. But this only covers the peripherals that U-Boot sets
up early, like serial, clocks, pinctrl, MMC, PCI, etc.

U-Boot typically does not init a peripheral unless it is needed for U-Boot.

While U-Boot is running (e.g. a script) it may start up other
peripherals (e.g. to read a kernel from USB) and in those cases errors
can be handled by the script.

You can use 'dm tree' to see what devices have been probed successfully.

Regards,
Simon