Hi Fabio,

On Thu, 18 May 2017 17:52, Fabio Estevam wrote:
> I got very slow performance with MX6UL when U-Boot is loaded via
> serial download mode.

That's it, actually!
I was booting the target via USB, booting from the NAND shows normal 
performance.


> This gets fixed by setting the SMP bit:
> https://patchwork.ozlabs.org/patch/747074/

I don't have that patch. I guess a similar code exists somewhere that is not 
entered when booting from USB.

Many thanks for your help!
--
Héctor Palacios



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