@debugging ,
You are right, that is why I asked if uboot file was already present in your artifact folder.
I think there was a misunderstanding concerning this folder so I will try to explain a little bit more how does it work, and I hope it will answer all your question in one.
Our BSP is composed by TF-A, UBOOT, OPTEE and Linux Kernel. We will keep the kernel out of this scope because it is not embedded in the FIP.
The Makefile.sdk with the all rule, both compile TF-A (this step is always good from your side) but also create the final FIP that will be deployed on the target.
But here, you are building only TF-A, so the new binaries that you you generate are only relative to TF-A ! It means that to compose your final FIP, you also need the U-Boot and OP-TEE binary files. But as you only compile TF-A, it will be impossible for the Makefile.sdk to invent U-boot and OP-TEE binaries, that is why we provide the FIP_artifacts folder. This is to provide you the other binaries that compose your FIP, and that are not generated by yourself.
If you erase these binaries, your FIP will be incomplete and ends with an error as you could have seen before in your case.
So, in a context of a custom board, how to process ?
In fact, in a custom board, you often have to update each element of the BSP. So you will compile TF-A, U-boot, OP-TEE, and then create a new FIP (you can see it like a box) where you will put inside each binary needed and waited by the BSP.
If you want to take the default binaries provided by ST, you can find it in the Starter Package we deliver each release (in the Flash tarball (see this article)).
I hope you have now a better view of how the FIP works, and why you faced your issue before.
Kind regards,
Erwan.
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