Hi Sven,
On Tue, Dec 28, 2021 at 8:57 AM Sven Schwermer sven@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-la...
Hope this helps.
Regards,
Fabio Estevam