Boot Linux FIT image from SPL

[Fabio Estevam]

Hi Sven,

On Tue, Dec 28, 2021 at 8:57 AM Sven Schwermer <sven at svenschwermer.de> wrote:
>
> Hi,
>
> I was wondering whether it's possible to boot a Linux FIT image (kernel
> zImage, DTB, initramfs) straight from SPL? Specifically, I'm trying to
> reduce the boot time when booting into a tiny Linux with RAM disk over
> USB SDP (i.MX6ULL). This works fine with the chain ROM -> SPL -> u-boot
> proper -> Linux. I have given it a try to boot the FIT image straight
> from SPL, but I'm getting a few (debug-level) errors:
>
> U-Boot SPL 2021.10-00003-gc254f7c98d-dirty (Dec 27 2021 - 20:15:09 +0100)
> Trying to boot from USB SDP
> SDP: initialize...
> SDP: handle requests...
> Downloading file of size 2440036 to 0x81000000... done
> Jumping to header at 0x81000000
> Header Tag is not an IMX image
> Found header at 0x81000000
> fit read sector 0, sectors=2440036, dst=88302888, count=2440036,
> size=0x253b64
> cannot find property 'firmware': -1
> kernel: 'kernel-1'
> Embedded data: dst=82000000, size=13caf0
> Image OS is Linux
> fdt: 'fdt-imx6ull-myir-mys-6ulx-eval.dtb'
> Embedded data: dst=8213caf0, size=64f7
> cannot find property 'loadables': -1
>
> The "loadables" config property seems to be specific to the u-boot
> proper FIT image. I have consulted the falcon-mode readme, but it
> doesn't mention FIT images which leads me to believe that this is not an
> intended use case?

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

Hope this helps.

Regards,

Fabio Estevam