Boot Linux FIT image from SPL

[Sven Schwermer]

Hi Fabio,

Thank you for the hint. That's a _very_ useful document. In the 
meantime, I have been able to boot my Linux FIT image straight from SPL 
on my i.MX6ULL platform.

I have, however, noticed that Linux boots much faster when launched from 
u-boot proper compared to SPL. Time to (initramfs) init is 1.2s vs. 5s. 
That is with identical FIT images (kernel, device tree, initramfs, 
kernel command line). I ruled out differing core clock rates (both run 
at 396MHz), caches (caches seem to be disabled before handing over to 
Linux) and differing load addresses (might cause additional relocations, 
copies).

What other setup could u-boot proper do that would make Linux boot 
faster that I haven't thought about?

Best regards,
Sven

On 12/28/21 13:15, Fabio Estevam wrote:
> On Tue, Dec 28, 2021 at 9:13 AM Fabio Estevam <festevam at gmail.com> wrote:
> 
>> People load FIT images via Falcon mode on Layerscape:
>> https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon4
> 
> There was a typo in the URL above. Correct one is:
> 
> https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon