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>open-source "librebootable" from the start

Already is.

There's a default flow with u-boot SPL, opensbi and u-boot.

There's an alternative flow which includes TianoCore (UEFI).

There's another alternative flow, oreboot.

All the tiny ROM inside the SoC does is fetch the next stage from elsewhere, as per the state of some GPIOs. One of the options is XMODEM on the UART.

DRAM setup and such happen in the next stage, which is e.g. u-boot SPL mentioned above.

>doesn't have the equivalent of the IME

There are some extra tiny cores in the SoC. They are available for you to use; you can implement an IME if you wanna. But by default they're doing nothing.



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