[U-Boot] [RFC] dm: tegra: boot time regression

[Simon Glass]

Hi Marcel,

On 21 October 2014 08:37, Marcel Ziswiler <marcel at ziswiler.com> wrote:
> Migrating our BSPs towards mainline U-Boot I noticed it suddenly booting
> slower. With mainline Linux I noticed about a 1 to 2 second increase
> while booting downstream L4T takes 10 to 15 seconds longer! Git
> bisecting it revealed the following commit to be at odds:
>
> 858530a8c0a7ce7e573e513934804a00d6676813
> dm: tegra: Enable driver model for serial
>
> Switching back to not using the DM driver for serial brings it back to
> booting much faster. However looking closely at the serial stuff and its
> accompanying settings I could not quite pinpoint why exactly any of this
> would make the Linux kernel suddenly boot slower.
>
> Has anybody noticed similar issues?
>

No I haven't but I have not really tested it. I wonder how U-Boot is
affecting Linux boot time? Do you have a trace of the kernel boot?

Regards,
Simon