Rootfs on SSD, OpenSBI+U-Boot on SD card?

I’m trying to set up a rootfs on a SATA SSD (connected using an NVME to SATA adapter) using debootstrap, to which I will add the kernel and other needed packages.

How can I properly compile OpenSBI and U-Boot such that the board knows to load my kernel from my SSD?

I’m sorry if the question is stupid, I find the docs on the Milk-V website a bit confusing.

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